CN206832296U - A kind of gas jet characteristic comprehensive measurement device - Google Patents

Abstract

The utility model relates to a gas jet characteristic comprehensive measurement device, which comprises a gas jet generating device and a real-time test data acquisition system. The gas jet generating device includes a high-pressure gas source connected sequentially through a gas supply pipeline, a pressure-stabilizing tank, a regulating valve, Stop valve, injection device; the test data real-time collection system includes a gas pipeline pressure real-time collection device, a gas pipeline flow real-time collection device, a gas jet injection force real-time collection device, a collection module and a computer. The utility model is a comprehensive measurement device for gas jet characteristics, which describes the physical behavior of the jet by directly measuring the flow rate, pipeline pressure and blowing force of the jet at the same time for the first time. It can comprehensively describe the performance of fluidic devices or nozzles in multiple dimensions.

Description

A comprehensive measurement device for gas jet characteristics

technical field

The utility model belongs to the technical field of gas jet flow measurement of fluid mechanics, and relates to a comprehensive measurement device for gas jet flow characteristics.

Background technique

Gas jet technology is widely used in aerospace, metallurgy, chemical industry, and food processing fields. In the field of metallurgy, gas jets are used in metallurgical processes such as converters, electric furnace smelting, and RH vacuum refining. The impact of the injected gas jets on the liquid surface of the molten pool causes complex physical phenomena such as penetration, splashing, and flow of the molten pool in the reactor. During the blowing process, the impact force of the injected gas jet on the liquid surface of the molten pool has a great influence on the metallurgical efficiency, slagging rate and molten steel splashing in the molten pool. Therefore, the injection performance test of the top blowing device and the research on the characteristics of the injection gas jet have become the focus and difficulty of the top blowing technology research. In view of the special conditions such as high temperature in the smelting environment, it is impossible to directly observe and measure the fluid characteristics of the injected gas jet and the physical behavior of the liquid surface of the molten pool. The characteristics of the gas jet are usually studied by cold test.

Pitot tube velocimetry is a commonly used gas jet measurement method. Put the pitot tube into the gas jet to measure the pressure difference between the total pressure and the static pressure at a certain point in the jet, and calculate the fluid flow rate at this point according to the Bernoulli equation. , and then measure the fluid characteristics of the gas jet. However, when measuring supersonic jet flow, the placement of pitot tube will cause flow field disturbance, which will bring difficulties to the measurement.

Particle image velocimetry (PIV) technology is a non-invasive fluid measurement technology, by injecting tracer particles into the jet, using an image recording system (such as a CCD camera, etc.) to record the position of the tracer particles in the flow field at different times, Using image processing technology to calculate the displacement and velocity of the tracer particles, so as to obtain the fluid velocity and related motion parameters at the particle location.

Laser Phase Doppler Particle Analysis (PDPA) technology puts tracer particles in the jet, uses a Doppler analyzer to measure the Doppler frequency shift of the scattered light of the tracer particles under laser irradiation, and calculates the particle size based on the Doppler frequency shift. Velocity, and then get the fluid velocity at the position of the particle.

Utility model patent application 201410146590.9 discloses a measurement method of gas jet flow field. The Wollaston prism optical element is used to form a differential interferometry system to image the center section of the space flow field in the test section, and collect the differential interference fringe pattern with carrier fringes at any time before and during the airflow injection, and then obtain the whole field The fringe series distribution and fluid optical refractive index gradient, and simultaneously obtain the fluid density gradient field, density field, temperature field, and temperature gradient field.

Utility model patent application 201510644060.1 discloses a device and method for synchronously measuring the velocity field and concentration field of the wall-adhering jet, by using a PIV camera to shoot the flow trajectory of PIV particles in the main airflow in the wall-attached jet, and a high-speed CCD camera to shoot oxygen-sensitive The color development law of the coating wall surface changes with the oxygen concentration in the jet, and realizes the simultaneous measurement of the velocity field and concentration field during the interaction between the wall-attached jet and the main airflow.

The document "Development of Nozzle Performance Test System" discloses a nozzle performance test system, which uses pressure measuring probes, negative pressure sensors, differential pressure sensors, displacement potentiometers, etc. to measure the ratio of the pressure before and after the nozzle to reflect the pressure of the nozzle. The pressure change at different cross-sections in the medium, and the fluid flow is calculated from the measured pressure difference.

The document "Design and Research of Rocket Gas Shock Load Identification Platform" discloses a general measurement platform for rocket gas jet impact load identification. A six-dimensional force measurement platform is combined through a parallel mechanism. When the model under test on the measuring platform is subjected to impact loads, the force load on the model under test can be measured by coupling the output values of the one-dimensional pressure sensors on the six driving rods. The system can directly measure the impact load of the jet, but it has the disadvantages of complex platform structure and difficult and cumbersome calibration process of the measurement system.

The document "Cold Experimental Research on Penetration Depth of Top-blown Gas Plane Jet to Melt Pool" discloses a method for measuring the impact force of the jet. By measuring the impact depth of the gas jet on the water surface, it is derived from the impact depth and water surface tension. Calculate the blowing jet impact force. This method can reflect the impact effect of the gas jet more intuitively, but it is only suitable for model experiments, and it is difficult to implement the evaluation of the jet characteristics of the injection device in the actual engineering site, and there are other jet characteristics such as cumbersome derivation and calculation process, and the inability to describe the degree of jet divergence. and other shortcomings.

Most of the existing gas jet measurement technologies describe the flow field characteristics of the gas jet by measuring the jet flow velocity, which cannot comprehensively describe the performance of the jet device or nozzle in multiple dimensions, and have the disadvantages of complex test system, high cost, cumbersome calculation and derivation process, and difficult Implement, measure and evaluate the jet characteristics of the injection device at the actual project site.

Utility model content

In view of this, the purpose of this utility model is to provide a kind of gas jet characteristic comprehensive measurement device.

In order to achieve the above object, the utility model provides the following technical solutions:

A gas jet characteristic comprehensive measurement device, comprising a gas jet generating device and a real-time test data acquisition system; the test data real-time acquisition system includes a gas pipeline pressure real-time acquisition device, a gas pipeline flow real-time acquisition device, and a gas jet injection force real-time acquisition device, acquisition module and computer, the gas jet blowing force real-time acquisition device is set up against the gas jet generation device and can move relative to the gas jet generation device, and the gas pipeline pressure real-time acquisition device and gas pipeline flow real-time acquisition device are set at At the entrance of the gas channel of the gas jet generating device, the gas jet blowing force real-time acquisition device, the gas pipeline pressure real-time acquisition device, and the gas pipeline flow real-time acquisition device are all connected to the computer through the acquisition module.

Further, the gas jet generating device is set on a test platform.

Further, the gas jet generating device includes a high-pressure gas source, a surge tank, a regulating valve, a shut-off valve, and a blowing device that are sequentially connected through a gas supply pipeline, and the real-time collection device for the blowing force of the gas jet is set facing the blowing device And it can move relative to the blowing device. The gas pipeline pressure real-time acquisition device and the gas pipeline flow real-time collection device are arranged at the gas channel inlet of the blowing device.

Further, the real-time collection device for the blowing force of the gas jet is arranged directly below the center line of the nozzle of the blowing device.

Further, the gas jet blowing force real-time acquisition device includes a force measuring disc, a force measuring disc support, a force sensor, and a fixing device. On the device, the height of the fixing device is adjustable.

The beneficial effect of the utility model is that: the utility model is a comprehensive measurement device for gas jet characteristics, which is the first time to directly measure the jet flow, pipeline pressure and blowing force to describe the physical behavior of the jet, which is more direct than describing the velocity flow field of the jet Reflecting the effect of the gas jet on the liquid level of the molten pool, it can comprehensively describe the performance of the jet device or nozzle in multiple dimensions. The measuring device of the utility model is simple, the test cost is low, the data processing process of the method is simple and intuitive, the implementation difficulty is low, and the jet characteristics of the injection device can be tested and evaluated on the spot in actual engineering.

Description of drawings

In order to make the purpose, technical solutions and beneficial effects of the utility model clearer, the utility model provides the following drawings for illustration:

Fig. 1 is the connection schematic diagram of the comprehensive measuring device of gas jet characteristic of the present utility model;

Fig. 2 is the inlet pressure of injection device a and injection device b, flow rate and injection jet injection force contrast figure;

Fig. 3 is a cluster comparison diagram of injection device a and injection device b;

Fig. 4 is a divergence comparison diagram of injection device a and injection device b;

Fig. 5 is a distribution diagram of the blowing force of the blowing device a at 1200 mm.

detailed description

The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the connection schematic diagram of a gas jet characteristic comprehensive measurement device of the utility model includes a gas jet generating device and a real-time test data acquisition system, and the gas jet generating device includes a high-pressure gas source connected sequentially through a gas supply pipeline , surge tank 1, regulating valve 3, shut-off valve 4, blowing device 8; said test data real-time collection system includes gas pipeline pressure real-time collection device 5, gas pipeline flow real-time collection device 6, gas jet injection force real-time collection Device, acquisition module 13 and computer 14, the real-time acquisition device of gas jet blowing force in this embodiment includes a force measuring plate 10, a force measuring plate support 15, a force sensor 11, a fixing device 12, and the force measuring plate 10 is detachably arranged on the measuring plate On the force plate support 15, the height of the above-mentioned fixing device 12 is adjustable through the force sensor 11 fixed on the fixing device 12. The real-time acquisition device for the gas jet blowing force is located directly below the spray head of the blowing device 8, and the height of the fixing device 12 can be adjusted up and down to change the distance between the spray head and the force measuring plate 10. The real-time acquisition device for gas pipeline pressure 5, the flow rate of the gas pipeline The real-time acquisition device 6 is arranged at the entrance of the gas channel of the nozzle device. The real-time acquisition device for the gas jet injection force, the real-time acquisition device 5 for gas pipeline pressure, and the real-time acquisition device 6 for gas pipeline flow are all connected to the computer 14 through the acquisition module 13.

High-pressure air source, compressed air storage tank 1, the pressure of the gas storage tank is 0.6-0.67MPa, the volume is 5m ³ , it is connected with the flange of the regulating valve 3 through the air supply pipeline 2, and is used to provide compressed air as the test medium;

The regulating valve 3 is connected to the air source flange through the air supply pipeline 1 at one end, and the other end is connected to the shut-off valve 4 flange to adjust the inlet pressure;

The shut-off valve 4 is flange-connected to the regulating valve 3 through the gas supply pipeline 2 at one end, and the other end is flange-connected to the gas channel inlet 7 for opening or cutting off the gas circuit;

The gas pipeline pressure real-time acquisition device 5 adopts a pressure transmitter with a range of 0-1MPa and a specification of 2-wire system of 4-20mA, installed at the inlet 7 of the gas channel for measuring and collecting the inlet pressure;

The gas pipeline flow real-time acquisition device 6 adopts a vortex flowmeter, model DLTUGE13 06-P2, specification DN65 flange type, PN1.6MPa, range 0-1200Nm ³ /h, installed at the entrance 7 of the gas channel, used for measurement, Acquisition gas flow rate;

Blowing device 8, the blowing device that present embodiment adopts is blowing device a and blowing device b, respectively tests blowing device a and blowing device b, compares;

The test platform 9 is used to install the gas supply pipeline 2, the regulating valve 3, the shut-off valve 4, the pressure transmitter, the vortex flowmeter and the blowing device 7;

Force measuring discs ¹⁰ , discs with areas of ^0.5m2 and 1m2 respectively, are installed on the real-time acquisition device for gas jet blowing force;

Gas jet blowing force real-time acquisition device, model NW50, maximum weighing range: 50KG, installed under the center line of the nozzle through the fixing device 12, used to measure and collect the size of the jet blowing force;

The fixing device 12 is used for installing the dynamometer 10 , the dynamometer support 15 , and the force sensor 11 , and the height of the fixing device 12 can be adjusted.

The collection module 13 and the computer 14 are used for data collection, recording and display.

The specific implementation steps of the comprehensive measurement of the top-blowing gas jet characteristics are as follows:

(1) Connect the pipeline as shown in Figure 1, connect the gas supply pipeline 2 to the oxygen channel inlet 7 of the blowing device b, connect the instrument circuit, and the debugging is ready;

(2) Inflate the gas storage tank to 0.65-0.67MPa for standby, and adjust the inlet pressure to 0.45MPa through the regulating valve 3;

( ³ ) 0.5m dynamometer 10 is installed on the gas jet blowing force real-time acquisition device, dynamometer 10 is 1200mm away from the nozzle;

(4) Open the shut-off valve 4, automatically collect inlet pressure, flow and injection force, record the atmospheric temperature and air pressure simultaneously, and close the shut-off valve 3 after 30 seconds;

(5) Repeat the test more than 3 times;

(6) Change the positions of different force measuring discs 10 and real-time acquisition devices for gas jet injection force for testing. The real-time acquisition devices for gas jet injection force are installed successively at distances of 1200mm, 1700mm, 2200mm, and 2700mm from the nozzle, respectively, under the center line of the nozzle. Measure the jet blowing force ^on discs of ^0.5m2 and 1m2 area.

(7) Connect the gas supply pipeline 1 to the inlet of the oxygen channel of the blowing device a, and repeat steps (2) to (6).

After the test is completed, the test data is processed and analyzed. As shown in Figure 2, the blowing force gradually decreases with the increase of the distance between the force measuring disc 10 and the outlet, and the difference between the blowing force measured by the small force measuring disc and the large force measuring disc gradually increases, which means that the jet flow increases with the The distance from the nozzle diverges; under the condition that the distance between the dynamometer 10 and the outlet is the same, the injection force of the injection device a is smaller than that of the injection device b, which means that the impact force of the injection device a on the molten steel surface is smaller than that of the injection device b.

Calculate the average value of the injection force in the stable inlet pressure section during the injection process, and use the injection force as an index to evaluate the concentration and divergence of the jet. Convergence refers to the degree of concentration of jet blowing force distribution on the same jet section; divergence refers to the jet blowing force on the same force-bearing area at different distances from the nozzle relative to the jet blowing force on the same force-bearing area at the nozzle. degree of loss. Calculate the concentration and divergence of the spray jet according to the following formula:

As shown in Figure 3, it is a comparison diagram of the clustering of the spraying device a and the spraying device b, and the clustering of the circular hole nozzle and the ring hole nozzle is equivalent. Figure 4 is a comparison diagram of the divergence of the injection device a and the injection device b. The divergence of the jet increases with the increase of the distance from the outlet, and the increase of the divergence of the jet is particularly significant on a small force-measuring area. At the same time, as the distance from the outlet increases, the degree of jet divergence is faster and more obvious; under this test condition, the jet divergence of injection device a is greater than that of injection device b.

As shown in Figure 5, for the distribution of the blowing force of the blowing device a at 1200 mm, the average blowing force on different areas of the jet cross-section can be measured by using force measuring discs with different areas (radii), and then the The distribution of injection force on the cross-section. It can be found that the more force measuring discs are used and the higher the area (radius) resolution of the measured range is, the closer the injection force distribution obtained from the test is to the real injection force distribution.

Finally, it is noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in the form Various changes can be made in the above and in the details without departing from the scope defined by the claims of the present invention.

Claims (5)

1. A kind of 1. gas jet characteristic comprehensive measurement device, it is characterised in that：Including gas jet generating means and test data Real-time acquisition system；The test data real-time acquisition system includes gas pipeline pressure real-time acquisition device, gas pipeline stream Measure real-time acquisition device, gas jet injection power real-time acquisition device, acquisition module and computer, the gas jet injection Power real-time acquisition device face gas jet generating means set and can opposing gas jet flow generating apparatus move, the flue The gas passage that road pressure real-time acquisition device, gas pipeline flow real-time acquisition device are arranged on gas jet generating means enters At mouthful, the gas jet injection power real-time acquisition device, gas pipeline pressure real-time acquisition device, gas pipeline flow are real-time Harvester connects computer by acquisition module.
2. A kind of 2. gas jet characteristic comprehensive measurement device according to claim 1, it is characterised in that：The gas jet Generating means is arranged on test platform.
3. A kind of 3. gas jet characteristic comprehensive measurement device according to claim 1 or 2, it is characterised in that：The gas Jet flow generating apparatus includes passing sequentially through the high-pressure air source of steam line connection, vacuum tank, regulating valve, stop valve, blowing device, The gas jet injection power real-time acquisition device face blowing device sets and can moved relative to blowing device, the flue Road pressure real-time acquisition device, gas pipeline flow real-time acquisition device are arranged at the gas channel inlet of blowing device.
4. A kind of 4. gas jet characteristic comprehensive measurement device according to claim 3, it is characterised in that：The gas jet Injection power real-time acquisition device is arranged on immediately below the center line of blowing device shower nozzle.
5. A kind of 5. gas jet characteristic comprehensive measurement device according to claim 4, it is characterised in that：The gas jet Being blown power real-time acquisition device includes dynamometry disk, dynamometry disc carrier, force snesor, fixing device, and the dynamometry disk is removably Be arranged on dynamometry disc carrier, by force snesor fix on the securing means, the fixing device it is Height Adjustable.