CN113297752A - Corrugated pipe pressure drop performance verification method based on water test - Google Patents
Corrugated pipe pressure drop performance verification method based on water test Download PDFInfo
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Abstract
A corrugated pipe pressure drop performance verification method based on a water test is characterized by comprising the following steps: step 1, acquiring relation data of flow and pressure drop of water in a corrugated pipe for testing under different working conditions by adopting a water testing device; step 2, modeling simulation is carried out on the corrugated pipe for the test, and relation data between the flow and the pressure drop of water and liquid nitrogen in the simulated corrugated pipe is obtained based on a simulation process; step 3, comparing the relation data of the flow and the pressure drop of the water in the corrugated pipe for the test and the relation data of the flow and the pressure drop of the water in the simulation corrugated pipe, which are obtained in the step 1 and the step 2, and analyzing error reasons in the test process and the simulation process; and 4, correcting the simulation process based on the error reasons in the simulation process obtained by analysis, and selecting an optimal simulation model. The method can effectively obtain the pressure drop performance of the corrugated pipe, evaluate and guide the simulation model, and accurately guide the design and manufacture of the high-temperature superconducting cable.
Description
Technical Field
The invention relates to the field of superconducting power transmission, in particular to a corrugated pipe pressure drop performance verification method based on a water test.
Background
The application of superconducting technology in power systems is various, and is one of the main directions of research on superconducting application in recent years. Compared to power cables, superconducting cables have great advantages, such as: the power transmission capacity is strong, the cost is saved, the occupied space is small, the line impedance is extremely low, the power transmission loss is small, and the anti-magnetic interference capacity is strong; the method allows long-distance power transmission with relatively low voltage, and can also transmit power underground, thereby avoiding noise, electromagnetic pollution and potential safety hazard caused by ultrahigh-voltage high-altitude power transmission and protecting the ecological environment.
At present, the encapsulation of a high-temperature superconducting cable in a bellows and the cooling thereof using flowing liquid nitrogen are the main encapsulation methods of high-temperature superconducting cables in the prior art. Therefore, the research on the resistance characteristic and the pressure drop characteristic of the fluid in the common corrugated pipe is of great significance to the design and the operation of the high-temperature superconducting cable. However, in the prior art, although the fluid flow characteristics in the bellows can be obtained by modeling and simulating the bellows, an effective bellows pressure drop performance verification and evaluation method is not available for the effectiveness and accuracy of the simulation method.
Therefore, a new verification method for the bellows voltage drop performance is needed.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a corrugated pipe pressure drop performance verification method based on a water test, which can analyze error reasons in the corrugated pipe simulation process and select an optimal simulation model by acquiring relation data of the flow and the pressure drop of water in a corrugated pipe for the test under different working conditions.
The invention adopts the following technical scheme. A corrugated pipe pressure drop performance verification method based on a water test comprises the following steps: step 1, acquiring relation data of flow and pressure drop of water in a corrugated pipe for testing under different working conditions by adopting a water testing device; step 2, modeling simulation is carried out on the corrugated pipe for the test, and relation data between the flow and the pressure drop of water and liquid nitrogen in the simulated corrugated pipe is obtained based on the simulation process; step 3, comparing the relation data of the flow and the pressure drop of the water in the corrugated pipe for the test and the relation data of the flow and the pressure drop of the water in the simulation corrugated pipe, which are obtained in the step 1 and the step 2, and analyzing error reasons in the test process and the simulation process; and 4, correcting the simulation process based on the error reasons in the simulation process obtained by analysis, and selecting an optimal simulation model.
Preferably, step 1 further comprises: adjusting a flow regulating valve of the water test device, and acquiring the flow of water in the corrugated pipe for the test under the current working condition and differential pressure data at two ends of the corrugated pipe as the pressure drop of the corrugated pipe after the readings of the flow meter and the differential pressure meter are stable; and changing the opening degree of a flow regulating valve of the water testing device, and repeating the steps under different working conditions until the obtained test data meet the minimum requirement of data fitting.
Preferably, step 1 further comprises: recording the flow data of the water in the corrugated pipe under different working conditions and the pressure difference data of two ends of the corrugated pipe corresponding to the flow data of the water in the corrugated pipe; and drawing discrete points of the data in a flow-pressure drop coordinate system based on the record, and fitting a flow-pressure drop relation of water in the corrugated pipe based on the discrete points.
Preferably, the abscissa of the flow-pressure drop coordinate system is the reynolds number used for characterizing the flow velocity of water, and the ordinate is the pressure drop per meter used for characterizing the pressure drop of the corrugated pipe; alternatively, the abscissa of the flow-pressure drop coordinate system is the flow velocity of water or liquid nitrogen, and the ordinate is the pressure drop per meter used to characterize the pressure drop of the bellows.
Preferably, the Reynolds number coefficient of the liquid nitrogen is obtained based on the dynamic viscosity and density data of water and the liquid nitrogen;
and generating a flow-pressure drop relation curve of the liquid nitrogen in the corrugated pipe based on the Reynolds number coefficient of the liquid nitrogen.
Preferably, the Reynolds number is
Wherein D is the diameter of the corrugated pipe,
u is the flow rate of water or liquid nitrogen in the bellows,
mu is the dynamic viscosity of water or liquid nitrogen in the corrugated pipe,
ρ is the density of water or liquid nitrogen.
Preferably, the Reynolds number coefficient of liquid nitrogen is 1, assuming that the Reynolds number coefficient of water is
In the formula, ρLiquid nitrogenIn the form of liquid nitrogenThe density of the mixture is higher than the density of the mixture,
ρwater (W)Is the density of the water and is,
μliquid nitrogenIs the dynamic viscosity of the liquid nitrogen,
μwater (W)Is the kinetic viscosity of water.
Preferably, the causes of errors during the test include errors caused by bending of the water line, errors caused by measuring and draining branches, and errors caused by instrumental measurements.
Preferably, the error cause in the simulation process includes solver model error; in the simulation process, SST k-omega model and laminar flow model are respectively adopted to obtain relation data of flow and pressure drop of water in the simulation corrugated pipe.
Preferably, the relation data of the flow and the pressure drop of the water in the simulated corrugated pipe, which is obtained by the SST k-omega model, is superior to the relation data of the flow and the pressure drop of the water in the simulated corrugated pipe, which is obtained by the laminar flow model.
The method has the beneficial effects that compared with the prior art, the method for researching the pressure drop performance of the corrugated pipe is provided, and the simulation data of the corrugated pipe is verified by comparing the test data acquired by the water test device with the simulation data of the corrugated pipe. By adopting the method, the pressure drop performance of the corrugated pipe as the high-temperature superconducting cable material in the actual use process can be effectively obtained, the simulation model can be more accurately evaluated and guided, the simulation algorithm can be optimized and corrected, and the optimal simulation model can be selected, so that the design and the manufacture of the high-temperature superconducting cable can be more accurately guided.
The beneficial effects of the invention also include:
1. the method disclosed by the invention has the advantages that the pressure drop performance of the corrugated pipe with water and liquid nitrogen as fluids is simulated and analyzed, the performance requirements on a corrugated pipe liquid loop and other measuring instrument equipment in the actual test process are reduced, the pressure drop performance of the corrugated pipe under normal temperature and normal pressure can be tested by taking water as the fluid, and the accurate pressure drop performance of the corrugated pipe with liquid nitrogen as the fluid can be obtained. The method of the invention uses water to accurately replace liquid nitrogen, and has ingenious idea and accurate simulation result.
2. In the method, the Reynolds number is selected as the flow velocity and flow measurement index of the water or the liquid nitrogen, compared with the method of directly adopting the flow velocity and flow index of the liquid, the method simplifies the operation process, and accurately discovers the curve relation between the Reynolds number and the bellows pressure drop, thereby laying a good foundation for modeling. The calculation method is accurate and has good realization effect.
3. In the invention, the multiple test results and the simulation results are analyzed, and various error causes are obtained, such as errors caused by the completion of a water pipeline in the test process, errors caused by measuring a drainage branch pipe, an instrument and the like, errors caused by gas-liquid two-phase flow in the pipe in the test process and the like. By increasing the average difference, for example 212Pa, as the offset between the test data and the simulation curve, the simulation model is obtained more accurately, and the bellows state under the actual working state of the superconducting cable is identified most accurately.
Drawings
FIG. 1 is a schematic structural diagram of a water test device in a corrugated pipe pressure drop performance verification method based on a water test according to the invention;
FIG. 2 is a graph showing a Reynolds number of water in a corrugated pipe versus pressure drop in a first embodiment of a method for verifying pressure drop performance of a corrugated pipe based on a water test according to the present invention;
FIG. 3 is a diagram illustrating a Reynolds number of water in a corrugated pipe versus pressure drop in a second embodiment of a method for verifying pressure drop performance of a corrugated pipe based on a water test according to the present invention;
FIG. 4 is a graph showing a Reynolds number of water in a corrugated pipe versus pressure drop in a third embodiment of a method for verifying pressure drop performance of a corrugated pipe based on a water test according to the present invention;
FIG. 5 is a schematic diagram of a relationship curve between flow and pressure drop of water and liquid nitrogen in a corrugated pipe obtained by simulation in an embodiment of a method for verifying pressure drop performance of a corrugated pipe based on a water test according to the present invention;
FIG. 6 is a schematic view of a relationship curve between flow and pressure drop of water and liquid nitrogen in a corrugated pipe obtained by simulation in another embodiment of a method for verifying pressure drop performance of a corrugated pipe based on a water test according to the present invention;
FIG. 7 is a schematic diagram showing comparison between test data and simulation results in a method for verifying pressure drop performance of a corrugated pipe based on a water test according to the present invention;
FIG. 8 is a schematic diagram of a comparison curve of flow-pressure drop relationship between a test process and a simulation process in a corrugated pipe pressure drop performance verification method based on a water test according to the present invention;
FIG. 9 is a schematic diagram of a comparison curve of the relationship between flow and pressure drop in the test process and the simulation process after correction in the method for verifying the pressure drop performance of the corrugated pipe based on the water test;
fig. 10 is a schematic diagram of a flow-pressure drop relation comparison curve obtained by different simulation models in the corrugated pipe pressure drop performance verification method based on the water test.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in FIG. 1, a method for verifying pressure drop performance of a corrugated pipe based on a water test comprises steps 1 to 4.
Specifically, a novel water test apparatus may be employed in the present invention. Fig. 1 is a schematic structural diagram of a water test device in a corrugated pipe pressure drop performance verification method based on a water test. As shown in fig. 1, the water test apparatus for the high temperature superconducting cable corrugated pipe of the present invention includes a water injection unit, a test corrugated pipe 1, a flow meter 2, and a differential pressure gauge 5. One end of the water injection unit is directly connected with one end of the test corrugated pipe 1, the other end of the water injection unit is connected with the other end of the test corrugated pipe 1 through a flowmeter 2, and the flowmeter 2 is used for measuring the mass flow of water in the pipeline. The two ends of the corrugated pipe are respectively connected with a differential pressure gauge 5, wherein the differential pressure gauge 5 is used for measuring the pressure difference at the two ends of the corrugated pipe 1 for testing. The water injection unit also comprises a water injection port 3, a water pump 4, a water valve 6 and a full check port 7 which are sequentially connected based on a water pipeline; wherein, water filling port 3 is the three-way valve, and both ends are connected with water pipeline through the flange mode respectively about for to water injection in the water pipeline. The water pump 4 is a variable frequency centrifugal pump and is used as a supercharging device for controlling the flow direction of water in the water pipeline. The water valve 6 is an electromagnetic adjusting ball valve and is used for controlling the flow rate of water in the water pipeline. The full check port 7 is a three-way full check port and is used for checking the water injection amount in the pipeline. When the variable frequency centrifugal pump is in a closed state and the liquid level position at the full testing port is higher than the highest position of the straight pipe, the water pipeline is in a water filling state. The water injection unit further comprises a blind plate for sealing the water injection port and testing the full port to seal the water pipeline after detecting that the water pipeline is in a full water state.
The flow meter is a mass flow meter and is used for measuring the mass flow of the water flowing through the corrugated pipe when the water test device is in a test state; and the differential pressure gauge is used for measuring the pressure drop of the water flowing through the corrugated pipe under the test state of the water test device. The testing state of the water testing device is that the variable frequency centrifugal pump is opened after a water pipeline is closed, and the electromagnetic adjusting ball valve adjusts water flow in the corrugated pipe to be in a state of fixed flow.
Preferably, step 1 further comprises: adjusting a flow regulating valve of the water test device, and acquiring the flow of water in the corrugated pipe for the test under the current working condition and differential pressure data at two ends of the corrugated pipe as the pressure drop of the corrugated pipe after the readings of the flow meter and the differential pressure meter are stable; and changing the opening degree of a flow regulating valve of the water testing device, and repeating the steps under different working conditions until the obtained test data meet the minimum requirement of data fitting.
In the embodiment of the invention, after the water pipeline is closed, the flow regulating valve, namely the electromagnetic regulating ball valve in the embodiment, can be firstly regulated to a smaller opening degree, and then the variable frequency centrifugal pump is started to pressurize the water pipeline so as to enable water in the water pipeline to flow. And after the water flow is stable, namely after the readings of the differential pressure meter and the mass flow meter are kept stable, recording the current differential pressure data and the mass flow data. Subsequently, the opening degree of the flow rate adjustment valve is adjusted, and data is recorded again. After a plurality of experiments, different pressure drop data of the corrugated pipe for the experiment under the condition of different water mass flow rates can be obtained.
Preferably, step 1 further comprises: recording the flow data of the water in the corrugated pipe under different working conditions and the pressure difference data of two ends of the corrugated pipe corresponding to the flow data of the water in the corrugated pipe; and drawing discrete points of the data in a flow-pressure drop coordinate system based on the record, and fitting a flow-pressure drop relation curve of the water in the corrugated pipe based on the discrete points.
Particularly, because the water test device can record the flow data of the experimental bellows under different operating modes and the pressure drop data at the bellows both ends. Therefore, the flow rate data of the water in the corrugated pipe can be obtained according to the flow data of the water obtained by the mass flow meter and the geometric shape of the corrugated pipe, such as the cross section area of the corrugated pipe. And further calculating the Reynolds number of the corrugated pipe under the current working condition by using a Reynolds number calculation formula. The Reynolds number is calculated by the formula
Wherein D is the diameter of the bellows, u is the flow velocity of the fluid in the bellows, in the present invention the flow velocity of water or liquid nitrogen, μ is the dynamic viscosity of the fluid in the bellows, in the present invention the dynamic viscosity of water or liquid nitrogen, and ρ is the corresponding fluid density.
On the other hand, the pressure difference data of two ends of the corrugated pipe under the current working condition can be obtained according to the differential pressure meter, and the pressure drop per meter of the corrugated pipe can be converted based on the length of the corrugated pipe. According to two parameters of the Reynolds number of the corrugated pipe and the pressure drop per meter of the corrugated pipe, the flow-pressure drop relation of the water in the corrugated pipe can be further obtained.
Preferably, the abscissa of the flow-pressure drop coordinate system is the reynolds number used to characterize the flow velocity of the water, and the ordinate is the pressure drop per meter used to characterize the pressure drop of the bellows.
Fig. 2 is a schematic diagram of a relationship curve between the reynolds number of water in the corrugated pipe and the pressure drop in the first embodiment of the method for verifying the pressure drop performance of the corrugated pipe based on the water test. Fig. 3 is a schematic diagram of a relationship curve between the reynolds number of water in the bellows and the pressure drop in the second embodiment of the method for verifying the pressure drop performance of the bellows based on the water test. Fig. 4 is a schematic diagram of a relationship curve between the reynolds number of water in the bellows and the pressure drop in the third embodiment of the method for verifying the pressure drop performance of the bellows based on the water test. As shown in fig. 2 to 4, fitting discrete points of the reynolds number and pressure drop measurement data of the water flow in the bellows obtained under different working conditions can obtain a relation curve of the reynolds number and the pressure drop per meter. Fig. 2, 3 and 4 are graphs of relationships obtained by tests based on different corrugated pipes, respectively. In fig. 2, the first embodiment adopts a corrugated pipe with a specification of D40, the second embodiment adopts a corrugated pipe with a specification of D50V1 in fig. 3, and the third embodiment adopts a corrugated pipe with a specification of D50V2 in fig. 4. Thus, three different Reynolds number vs. pressure drop per meter were obtained.
Preferably, the Reynolds number coefficient of the liquid nitrogen is obtained based on the dynamic viscosity and density data of water and the liquid nitrogen; and generating a flow-pressure drop relation curve of the liquid nitrogen in the corrugated pipe based on the Reynolds number coefficient of the liquid nitrogen.
And comparing the three curves in the graphs in the figures 2 to 4, selecting the curve with the minimum error in the three fitted curves, and performing the next operation. For example, one curve that has the smallest distance between the fitted curve and the discrete points obtained for all experimental data may be selected as the basis. The corrugated pipe with the specification is selected to carry out the next operation, namely, the flow-pressure drop relation curve of water and liquid nitrogen is compared.
Specifically, when the reynolds number is taken as the abscissa, the pressure drop characteristics of the bellows when the fluid is water and liquid nitrogen can be obtained, and the pressure drop characteristics of the bellows and the liquid nitrogen are obviously different from each other as can be seen by comparison. This is because the reynolds number is calculated by the formula including two parameters of the dynamic viscosity of the fluid and the density of the fluid. The dynamic viscosity of water is 0.0084 Pa.s, the dynamic viscosity of liquid nitrogen is 0.0022 Pa.s, and the dynamic viscosity of water is obviously higher than that of liquid nitrogen. The density of water was 1000kg · m-3The density of the liquid nitrogen is 808kg · m-3It can be seen that the density of water is slightly greater than that of liquid nitrogen. Further, according to the calculation formula of Reynolds number，
Liquid nitrogen has a Reynolds number coefficient of
In the formula, ρLiquid nitrogenIs the density of liquid nitrogen, pWater (W)Is the density of water, muLiquid nitrogenIs the kinetic viscosity of liquid nitrogen, muWater (W)Is the kinetic viscosity of water. Assuming that the Reynolds number coefficient of water is 1, the Reynolds number coefficient of liquid nitrogen can be obtained as
According to the Reynolds number coefficient of the liquid nitrogen, the abscissa can be expanded based on the flow-pressure drop relation curve of the water in the corrugated pipe, and the flow-pressure drop relation curve of the liquid nitrogen is obtained. Assuming that the flow rate of water and liquid nitrogen in the bellows is the same, the flow rate-pressure drop curve of liquid nitrogen can be approximated to a curve obtained by expanding the flow rate-pressure drop curve of water by 3.085 times on the horizontal axis.
And 2, modeling and simulating the corrugated pipe for the test, and acquiring relation data between the flow and the pressure drop of water and liquid nitrogen in the simulated corrugated pipe based on the simulation process.
In the invention, the corrugated pipe can be simulated under the condition that the fluid in the corrugated pipe is water and liquid nitrogen respectively, and the relation data of the water flow and the pressure drop and the relation data of the liquid nitrogen flow and the pressure drop are obtained through a simulation algorithm.
Preferably, the abscissa of the flow-pressure drop coordinate system is the flow velocity of water or liquid nitrogen and the ordinate is the pressure drop per meter characterizing the pressure drop of the bellows.
Fig. 5 is a schematic diagram of a flow-pressure drop relation curve of water and liquid nitrogen in a corrugated pipe obtained by simulation in an embodiment of a corrugated pipe pressure drop performance verification method based on a water test. Fig. 6 is a schematic diagram of a flow-pressure drop relation curve of water and liquid nitrogen in a corrugated pipe obtained by simulation in another embodiment of a corrugated pipe pressure drop performance verification method based on a water test. As shown in FIG. 5, due to the characteristic difference between water and liquid nitrogen, the deviation of Reynolds number is obvious in the relation curve of flow and pressure drop obtained by simulation. However, since in the present invention, the main concern is the difference in pressure loss of the fluid at a certain mass flow rate. As shown in fig. 6, on the premise of the same flow velocity, the densities of water and liquid nitrogen are slightly different, so the pressure loss in the bellows using water as the working medium is slightly larger than the pressure loss in the bellows using liquid nitrogen as the working medium.
And 3, comparing the relation data of the flow and the pressure drop of the water in the corrugated pipe for the test obtained in the step 1 and the step 2 with the relation data of the flow and the pressure drop of the water in the simulation corrugated pipe, and analyzing error reasons in the test process and the simulation process.
FIG. 7 is a schematic diagram showing comparison between test data and simulation results in a method for verifying pressure drop performance of a corrugated pipe based on a water test. As shown in fig. 7, the triangle values are data obtained by the test platform, and the circle data are simulation results. When the inlet flow velocity of liquid nitrogen at the inlet of the corrugated pipe reaches more than 0.2m/s, the fitting degree between the test data and the simulation data is higher, and the maximum deviation between the theoretical simulation value and the test value is kept within 15%. And when the inlet speed is smaller than 0.2m/s, the test data is obviously larger than the simulation value, and the influence of the speed on the test data is small. The reason for this deviation is that when the liquid nitrogen passes through the bellows at a small flow rate, the liquid nitrogen does not fill the entire bellows, which results in significant two-phase flow of gas and liquid within the tube. At this time, the pressure drop inside the bellows rapidly increases due to the presence of nitrogen, and thus an error occurs between the actual test data and the theoretical simulation data.
According to the comparison process, when the flow rate of the liquid nitrogen is greater than 0.2m/s, the geometric model of the corrugated pipe and the numerical simulation of the flowing of the liquid nitrogen, which are established in the invention, can be considered to accurately represent the pressure drop characteristic of the flowing liquid nitrogen in the corrugated pipe.
Preferably, the error causes in the test process further include errors caused by bending of the water pipeline, errors caused by measuring and draining branch pipes, and instrument measurement errors.
Fig. 8 is a schematic diagram of a comparison curve of flow-pressure drop relationship between a test process and a simulation process in the corrugated pipe pressure drop performance verification method based on a water test. As shown in fig. 8, the data obtained in step 1 and step 2 are summarized, and it can be known that there is a certain difference between the water test data, the water simulation data and the liquid nitrogen simulation pressure drop. As shown in FIG. 7, the water test data is in the speed range of 0.3-1.2 m/s, and the pressure drop data is higher than the simulation data by 180 Pa-220 Pa on average. It can be known from analysis that only the fluid pressure drop caused by the bellows is recorded in the water simulation data obtained in the simulation process. In order to obtain test data, the pressure drop of water is caused by the bent portion of the test line, the branch line for detecting the pressure drop, and other necessary devices. In addition, the instrument has some testing errors during the testing process. These reasons all lead to different test results than the pressure drop of the bellows when applied in a high temperature superconducting cable.
In order to eliminate the test error, the pressure drop data of the water in the corrugated pipe can be subjected to error elimination. For example, in the present embodiment, the average difference value 212Pa between the experimental data and the simulation curve may be taken as an error. This value can optionally be subtracted from the water test data or added to the water simulation data so that the water simulation data further coincides with the water test data.
Fig. 9 is a schematic diagram of a comparison curve of the flow-pressure drop relationship between the test process and the simulation process after correction in the corrugated pipe pressure drop performance verification method based on the water test. As shown in fig. 9, in order to further overlap the water simulation data with the water test data, the water simulation data is shifted upward by 212Pa as a whole on the vertical axis of the coordinate system in the present invention. After translation, it can be obtained that the water simulation data substantially coincide with the water test data. Therefore, it can be seen that the simulated water simulation data can better simulate the fluid flow and pressure drop characteristics in the bellows by using the current model.
And 4, correcting the simulation process based on the error reasons in the simulation process obtained by analysis, and selecting an optimal simulation model.
Generally speaking, in performing a waveform tube simulation process, a variety of different simulation modeling methods may be selected for use based on the performance of the software to simulate the motion of a fluid within the waveform tube. In general, two main flow fluid motion models can be selected, namely a turbulent flow model and a laminar flow model. In the present invention, the SST k-omega model can be used as a model of turbulence.
Fig. 10 is a schematic diagram of a flow-pressure drop relation comparison curve obtained by different simulation models in the corrugated pipe pressure drop performance verification method based on the water test. As shown in fig. 10, the graph shows the relationship curve of flow and pressure drop obtained through a plurality of different simulation models and the relationship data of flow and pressure drop obtained through the corrected experiment. In the graph, a curve of a rectangular point is a flow-pressure drop relation curve obtained through simulation according to the SST algorithm, and a curve of a circular point is a flow-pressure drop relation curve obtained through simulation according to a laminar flow model. In fig. 10, the two different algorithm models have a certain difference in obtaining the flow-pressure drop relation, that is, in the simulation process, the choice of the solution model is one of the causes of error generation.
Preferably, the error cause in the simulation process includes solver model error; in the simulation process, SST k-omega model and laminar flow model are respectively adopted to obtain relation data of flow and pressure drop of water in the simulation corrugated pipe.
Preferably, the relation data of the flow and the pressure drop of the water in the simulated corrugated pipe, which is obtained by the SST k-omega model, is superior to the relation data of the flow and the pressure drop of the water in the simulated corrugated pipe, which is obtained by the laminar flow model. Analysis shows that the turbulent flow model can better inosculate water experimental data in the whole Reynolds number interval, and the result obtained by the laminar flow model is always about 20% lower than that of the turbulent flow model. This is related to the fact that the laminar flow model cannot accurately predict the turbulence structure near the near wall surface, and thus underestimates the pressure drop in the pipe. Therefore, according to the water test, a reference can be further provided for the model of the selection solver.
The method has the beneficial effects that compared with the prior art, the method for researching the pressure drop performance of the corrugated pipe is provided, and the simulation data of the corrugated pipe is verified by comparing the test data acquired by the water test device with the simulation data of the corrugated pipe. By adopting the method, the pressure drop performance of the corrugated pipe as the high-temperature superconducting cable material in the actual use process can be effectively obtained, the simulation model can be more accurately evaluated and guided, the simulation algorithm can be optimized and corrected, and the optimal simulation model can be selected, so that the design and the manufacture of the high-temperature superconducting cable can be more accurately guided.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
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