CN105673626A - Turbulence flow-to-laminar flow casing pipe heating temperature field collection device - Google Patents

Abstract

The invention relates to the field of pipeline fluid calculation and heating, in particular to a turbulent rheological laminar flow casing heating temperature field acquisition device. Including the outer tube and the inner tube, the inner tube is set inside the outer tube, the inner tube is set along the direction of fluid flow, the inner tube is fixed inside the outer tube, and the front part of the inner tube along the direction of fluid flow is provided with a rectification grid and a throttle net in sequence, and the rectification grid is set inside The front end of the tube and the middle part of the inner tube are equipped with a speedometer, and the rear part of the inner tube along the fluid flow direction is provided with a thermocouple embedding place and a throttling net in turn, wherein the throttling net is set at the rear end of the inner tube, along the circumference of the inner tube Several thermocouple embedding places are set at intervals in the direction, the thermocouples are fixed at the thermocouple embedding places, and the outer surface of the inner tube is wound with resistance wires. Its structure is simple, easy to use, not only can change the high-speed turbulent fluid into slow laminar fluid, but also can collect the numerical value of the velocity and temperature field of the fluid.

Description

Acquisition device for turbulent rheological laminar flow casing heating temperature field

technical field

The invention relates to the field of pipeline fluid calculation and heating, in particular to a turbulent rheological laminar flow casing heating temperature field acquisition device.

Background technique

The central problem of turbulence solution is to find the statistical solution of the basic equation of turbulence, the Navier-Stokes equation. Due to the nonlinearity of this equation and the irregularity of the turbulence solution, turbulence theory has become the most difficult and fascinating field in fluid mechanics. Although turbulence has been studied for more than one hundred years, there is no mature and accurate theory so far, and many basic technical problems cannot be explained theoretically.

For the laminar motion of viscous fluids, the trajectories of the fluid micelles do not have obvious irregular pulsations. There is only momentum exchange between adjacent fluid layers due to molecular thermal motion. Laminar flow computing is also relatively mature.

For engineering calculations that do not involve the state of the fluid, such as engineering practice that only needs to know the thermophysical properties of the fluid, the workload of the laminar flow state is much lower than that of the turbulent flow state, so the turbulent flow is converted to laminar flow and then the temperature field or pressure Field collection will effectively reduce the difficulty of work. For example, when the oil-water emulsion is extracted, the water-in-oil emulsion is generally under laminar flow conditions, but the oil-in-water oil-water emulsion is generally under turbulent flow conditions, so in order not to involve turbulence in the calculation The flow control equation also changes the fluid under turbulent flow into a laminar flow state, so that the fluid is heated to change its temperature field, and the inverse problem method is used to calculate the composition of the mixed liquid.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned defects in the prior art, and propose a turbulent rheological laminar flow sleeve heating temperature field acquisition device, which is simple in structure and easy to use, and can not only convert high-speed turbulent fluid into slow-velocity layer Flow fluid, but also can collect the value of velocity and temperature field of fluid.

The technical solution of the present invention is: a turbulent rheological laminar flow sleeve heating temperature field acquisition device, which includes an outer tube and an inner tube, the inner tube is arranged in the outer tube, the inner tube is arranged along the fluid flow direction, the inner tube is fixed in the outer tube, The front part of the inner tube along the fluid flow direction is provided with a rectification grid and a throttle net in sequence, the rectifier grid is set at the front end of the inner tube, the middle part of the inner tube is provided with a speedometer, and the rear part of the inner tube along the fluid flow direction is sequentially provided with a thermocouple buried and throttling net, wherein the throttling net is set at the rear end of the inner tube, and several thermocouple embedding places are arranged at intervals along the circumferential direction of the inner tube, and the thermocouple is fixed at the embedding place of the thermocouple, and the outer surface of the inner tube is wound with a resistor Silk.

In the present invention, both the outer tube and the inner tube are quartz tubes.

The inner tube can be fixed in the outer tube by an inner tube support frame.

A group of staggered guide vanes are arranged in the rectifying grid, and the fluid is combed through the guide vanes to make the fluid pass through smoothly and orderly.

The velocimeter may be a Pitot tube. One end of the Pitot tube is set in the inner tube, and the other end is set outside the outer tube. The flow velocity of the liquid in the inner tube can be accurately measured through the Pitot tube.

Beneficial effects of the present invention: the present invention is simple in structure and easy to use, and realizes that when solving the physical properties of the fluid in the pipeline, the complex fluid in the pipeline, that is, the turbulent fluid, is changed into a simple fluid, that is, a laminar flow fluid, and the velocity and temperature field of the fluid are changed at the same time The collection greatly reduces the workload and calculation.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a vector simulation diagram of the fluid velocity in the casing;

Fig. 3 is a vector simulation diagram of the fluid velocity in the casing at the inlet;

Figure 4 is the instantaneous velocity diagram of the cross-section inside the pipe.

In the figure: 1 outer tube; 2 inner tube; 3 Pitot tube; 4 thermocouple buried; 5 inner tube support frame; 6 throttling net; 7 resistance wire; 8 rectifier grid.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1 , the turbulent rheological laminar flow sleeve heating temperature field collection device is tubular, including an outer tube 1 and an inner tube 2 , both of which are quartz tubes. The inner tube 2 is arranged in the outer tube 1 , and the inner tube 2 is arranged along the fluid flow direction, and the inner tube 2 is fixed in the outer tube 1 through the inner tube support frame 5 . The front part of the inner pipe 2 along the fluid flow direction is provided with a rectifying grid 8 and a throttle net 6 in sequence. The rectifying grid 8 is arranged at the front end of the inner pipe 2. The effect of setting the rectifying grid is that when the fluid passes through the pipeline, the fluid distribution is not smooth due to the change of the flow direction. Both cause energy loss, resulting in increased pipeline flow resistance, and the fluid is prone to turbulent flow. A group of staggered guide vanes are arranged in the rectifying grid 8, and the fluid is combed through the guide vanes to make the fluid pass through smoothly and orderly. The function of the throttling net 6 is to fully increase the pipe flow resistance to reduce the flow velocity into the pipe. The fluid entering the inner tube 2 forms a stable laminar flow through the rectifying grid 8 and the throttling net 6 .

The middle part of the inner tube 2 is provided with a velocimeter, and the velocimeter adopted in this embodiment is a Pitot tube 3, one end of the Pitot tube 3 is arranged in the inner tube 2, and the other end is arranged on the outside of the outer tube 1, and the Pitot tube can be accurately measured. The velocity of the liquid in the inner tube.

The rear part of the inner tube 2 along the fluid flow direction is provided with a thermocouple embedding place 4 and a throttling net 6 in sequence, wherein the throttling net 6 is set at the rear end of the inner tube 2 . The purpose of setting the throttling net 6 is to reduce the flow velocity of the fluid in the inner tube, so that the inner tube 2 becomes full of liquid. A plurality of thermocouple embedding places 4 are arranged at intervals along the circumferential direction of the inner tube 2. In this embodiment, six thermocouple embedding places 4 are arranged. The thermocouples are fixed at the thermocouple embedding places, and the temperature of the fluid in the inner pipe 2 is collected by the thermocouples. field.

The outer surface of the inner tube 2 is wound with a resistance wire 7, and the fluid in the inner tube 2 is evenly heated by the resistance wire 7.

As shown in Figure 3 and Figure 4, at the inlet of the inner tube, the velocity changes significantly, indicating that the deceleration effect of the inner tube is obvious. Under appropriate conditions, the fluid in the inner tube can be changed to a laminar flow with a lower velocity, as shown in Figures 2 and 4.

The working principle of the present invention is as follows: when a fluid with a relatively high flow rate enters the pipeline in the form of turbulent flow, it first passes through the rectifying grid 8 near the mouth of the inner tube 2 to comb the fluid, and then the fluid entering the inner tube will pass through Throttle net 6, at this moment the flow velocity of fluid in the inner pipe will significantly reduce. When the fluid flows slowly in the inner tube, the resistance wire 7 is turned on for heating, so that the fluid in the inner tube has a more obvious temperature rise. At the same time, the thermocouple records the change of the fluid temperature field and the time, so that the physical properties of the fluid and other factors can be analyzed later. calculate.

Claims (5)

1. a turbulent flow change layer stream sleeve pipe heating-up temperature field harvester, it is characterized in that: include outer tube (1) and interior pipe (2), interior pipe (2) is arranged in outer tube (1), interior pipe (2) is arranged along fluid flow direction, interior pipe (2) is fixed in outer tube (1), interior pipe (2) sets gradually honeycomb screen (8) and throttling net (6) along the front portion of fluid flow direction, honeycomb screen (8) is arranged on the front end of interior pipe (2), the middle part of interior pipe (2) is provided with tachymeter, interior pipe (2) sets gradually thermocouple and buries place (4) and throttling net (6) underground along the rear portion of fluid flow direction, the net (6) that wherein throttles is arranged on the rear end of interior pipe (2), circumferencial direction interval along interior pipe (2) arranges several thermocouple and buries place (4) underground, thermocouple is fixed on thermocouple and buries place underground, the outer surface of interior pipe (2) is wound with resistance wire (7).

2. turbulent flow change layer stream sleeve pipe heating-up temperature field according to claim 1 harvester, it is characterised in that: described outer tube (1) and interior pipe (2) are quartz ampoule.

3. turbulent flow change layer stream sleeve pipe heating-up temperature field according to claim 1 harvester, it is characterised in that: said inner tube (2) is fixed in outer tube (1) by interior pipe bracing frame (5).

4. turbulent flow change layer stream sleeve pipe heating-up temperature field according to claim 1 harvester, it is characterised in that: described honeycomb screen is provided with staggered guide vane in (8).

5. turbulent flow change layer stream sleeve pipe heating-up temperature field according to claim 1 harvester, it is characterized in that: described tachymeter is Pitot tube (3), one end of Pitot tube (3) is arranged in interior pipe (2), and the other end is arranged on the outside of outer tube (1).