Heat transfer wind tunnel test bed
By designing a heat transfer wind tunnel test rig in the wind tunnel, and using equipment such as honeycomb rectifiers and damping nets, combined with a high-power heating film, the problem of slow heating speed in the wind tunnel was solved, achieving rapid and uniform heating and airflow stability, while reducing noise and energy loss.
Patent Information
- Application Number
- CN202420464908.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-03-12
AI Technical Summary
When using electric heating technology, existing wind tunnels have short contact time between air and the heating device, resulting in poor heating speed and difficulty in quickly achieving the expected heating effect.
A heat transfer wind tunnel test bench was designed, including a centrifugal fan power section, a diffusion section, a heater, a stabilization section, a contraction section, a test section, and a corner section. It adopts rectification equipment such as honeycomb rectifiers and damping nets, combined with a high power density heating film, to improve airflow quality and increase heating efficiency.
It achieves rapid and uniform air heating, improves the heating speed and airflow stability of the wind tunnel, reduces noise and energy loss, has a compact structure, is easy to operate, and is highly safe.
Smart Images
Figure CN223756287U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of direct current wind tunnel device, specifically relates to a kind of heat transfer wind tunnel test bench. BACKGROUND
[0002] Wind tunnel, namely wind tunnel laboratory, is a kind of pipeline-shaped experimental equipment to simulate the flow of gas around aircraft or entity in artificial way and control airflow, and can measure the effect of airflow on entity and observe physical phenomena, and it is one of the most commonly used and effective tools for aerodynamic experiment. With the development of industrial aerodynamics, wind tunnel is used more and more widely, not only aerospace, but also transportation and construction will use wind tunnel.
[0003] The existing wind tunnel has certain defects when heating air; the current part of the object needs to be in high temperature environment when testing in wind tunnel, so in order to create high temperature environment, the air in the wind tunnel is generally heated, the common wind tunnel heating technology is combustion heating and electric heating, in the two technologies, combustion heating will produce pollutants, so it is less used, and the more commonly used is electric heating technology. However, when the current wind tunnel uses electric heating technology to heat air, the inside of the wind tunnel mostly has only one electric heating device, and the air in the wind tunnel has a certain flow rate, so that the air contacts the electric heating device for a short time, which leads to that the electric heating device has poor heating speed when heating the air in the wind tunnel, and it is difficult to quickly achieve the expected heating effect, so the existing wind tunnel has certain defects. UTILITY MODEL CONTENT
[0004] The utility model aims at overcoming the defects of prior art, and provides a kind of heat transfer wind tunnel test bench, which has the characteristics of less occupied area, compact structure, simple operation, high safety level and good visibility.The honeycomb straightener 12:1 compression ratio of the inlet contraction section can ensure that the airflow smoothly enters the working section, which is beneficial to improve the airflow quality of the test section.
[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of heat transfer wind tunnel test bench, including centrifugal fan power section, diffusion section, heater, stable section, contraction section, first test section, first corner section, second test section, second corner section, third test section, exhaust diffusion section, the stable section is equipped with honeycomb and several layers of damping net.
[0006] Preferably, the hole body structure of the heat transfer wind tunnel test bench is a steel structure.
[0007] Preferably, the centrifugal fan power section is made of Q235 material.
[0008] Preferably, the honeycomb rectifier and a plurality of layers of damping nets are arranged in the stable section in sequence along the airflow direction; the honeycomb rectifier is composed of small grids of regular hexagons; the stable section is provided with a maintenance door.
[0009] Preferably, the cross section of the diffusion section is trapezoidal, the diffusion section is provided with a door, and the downstream end of the diffusion section is provided with a safety net.
[0010] Preferably, the contraction section adopts a modified double quintic curve.
[0011] Preferably, different numbers of guide vanes are arranged in the first corner section and the second corner section, respectively.
[0012] Preferably, the bottom plate of the first test section and the second test section is respectively provided with a uniform temperature plate and a heating film, and the power density of the heating film is above 3500W / ㎡.
[0013] The beneficial effects of the utility model are:
[0014] (1) The test section provides three kinds of channel configurations: straight channel, U-shaped channel and S-shaped channel.
[0015] (2) The device improves the airflow quality of the test section through the compression ratio of 12:1 of the honeycomb rectifier of the inlet contraction section, improves the uniformity of the wind speed of the device, reduces the turbulence degree, reduces the airflow deflection angle and reduces the noise of the device. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is the front view schematic diagram of the utility model;
[0017] Mark: 1, centrifugal fan power section, 2, diffusion section, 3, heater, 4, stable section, 41, honeycomb rectifier, 42, damping net, 5, contraction section, 6, first test section, 7, first corner section, 8, second test section, 9, second corner section, 10, third test section, 11, exhaust diffusion section. DETAILED DESCRIPTION
[0018] The technical scheme of the utility model embodiment will be described clearly and completely in combination with the drawings of the utility model.
[0019] As Figure 1 shown, the utility model discloses a heat transfer wind tunnel test bench, including centrifugal fan power section 1, diffusion section 2, heater 3, stable section 4, honeycomb rectifier 41, damping net 42, contraction section 5, first test section 6, first corner section 7, second test section 8, second corner section 9, third test section 10, exhaust diffusion section 11.
[0020] A heat transfer wind tunnel test bed comprises a centrifugal fan power section, a diffusion section, a heater, a stable section, a contraction section, a first test section, a first corner section, a second test section, a second corner section, a third test section, an exhaust diffusion section, and a honeycomb device and a plurality of layers of damping nets arranged in the stable section.
[0021] The tunnel body structure of the heat transfer wind tunnel test bed is a steel structure.
[0022] The centrifugal fan power section is made of Q235 material.
[0023] The honeycomb device and the plurality of layers of damping nets are arranged in the stable section along the airflow direction in sequence; the honeycomb device is made of fine grids in the shape of regular hexagons; and a maintenance door is arranged on the stable section.
[0024] The diffusion section has a trapezoidal cross section, a door is arranged on the diffusion section, and a safety net is arranged at the downstream end of the diffusion section.
[0025] The contraction section adopts a modified double quintic curve.
[0026] Different numbers of guide vanes are arranged in the first corner section and the second corner section respectively.
[0027] The bottom plates of the first test section and the second test section are respectively provided with uniform temperature plates and heating films, and the power density of the heating films is above 3500 W / ㎡.
[0028] Specifically, the working principle is that the centrifugal fan power section 1 is installed with a diffusion section 2 between the heater 3, the diffusion section 2 is a diffusion pipeline, so that the airflow is uniformly diffused, and the downstream of the diffusion section 2 is connected with the heater 3. The heater 3 is connected downstream of the diffusion section 2, and located between the diffusion section 2 and the stabilization section 4. The stabilization section 4 is an equal-diameter pipeline, and the downstream is connected with the contraction section 5. The stabilization section 4 is installed with a honeycomb device 41 and a plurality of layers of damping nets 42 and other rectifying equipment, and the airflow gradually stabilizes and attenuates the residual small vortex after passing through the honeycomb device 41 and the damping net 42, so that the airflow remains uniform and stable. The contraction section 5 is a contraction pipeline, so that the airflow is uniformly accelerated, and the airflow does not appear separation on the hole wall when flowing along the contraction section 5. The airflow at the outlet of the contraction section 5 is required to be uniform, flat and stable, so the contraction section 5 should not be too long, and the appropriate length of the contraction section 5 can reduce the cost of wind tunnel construction and reduce energy loss. The first test section 6 is placed with a test model, which is used for testing the wind speed. In the embodiment, the wall surface of the second test section 6 is provided with a diffusion angle shielding effect. The first test section 6 is provided with front and rear transparent doors and windows, which are made of transparent glass, so as to facilitate observation and replacement of test products. The first corner section 7 is located between the first test section 6 and the second test section 8, which is required for forming a closed loop on one hand, and on the other hand, mainly to prevent airflow separation, improve airflow flow and reduce loss. The second test section 8 is placed with a test model, which is used for testing the wind speed. In the embodiment, the wall surface of the second test section 8 is provided with a diffusion angle shielding effect. The second test section 8 is provided with front and rear transparent doors and windows, which are made of stepped organic tempered glass, so as to facilitate observation and replacement of test products. The second corner section 9 is located between the second test section 8 and the third test section 10, which is required for forming a closed loop on one hand, and on the other hand, mainly to prevent airflow separation, improve airflow flow and reduce loss. The third test section 10 is placed with a test model, which is used for testing the wind speed. In the embodiment, the wall surface of the third test section 10 is provided with a diffusion angle shielding effect. The third test section 10 is provided with front and rear transparent doors and windows, which are made of stepped organic tempered glass, so as to facilitate observation and replacement of test products. The exhaust diffusion section 11 is located downstream of the third test section 10, and the main function is to restore the kinetic energy of the airflow to pressure energy, and reduce the energy loss of the airflow in the downstream sections of the diffusion section.
[0029] As Figure 1As shown, the contraction section 5 is a contraction pipeline, which makes the airflow uniformly accelerated to meet the flow rate requirement of the first test section 6. The airflow at the outlet of the contraction section 5 is required to be uniform, flat and stable, so the contraction section 5 is not too long, and the appropriate contraction section length can reduce the cost of wind tunnel construction and energy loss. The inlet of the contraction section 5 (i.e. the port close to the first test section 6) is preferably 1.8mφ1.8m, and the outlet (i.e. the port close to the first test section 6) is preferably 1.2mφ1.2m. The size of the inlet and outlet of the contraction section 5 can be designed according to actual needs. Moreover, the contraction section 5 adopts the modified double quintic curve to ensure that the flow field technical quality is excellent.
[0030] As shown in Figure 1 As shown, the honeycomb device 41 and a plurality of layers of damping nets 42 are arranged in the stable section 4 in sequence along the airflow direction, wherein the honeycomb device 41 is used for guiding and dividing the airflow vortex, which is beneficial to accelerate the decay of the vortex. The cross-sectional shape of the honeycomb cells on the honeycomb device 41 can be selected from one of a circle, a rectangle and a hexagon, and of course, other shapes can also be selected. In the embodiment, the cross-sectional shape of the honeycomb cells is a regular hexagon.
[0031] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses or adaptive changes of this application following in general the principles of the application and including such departures from the present disclosure that come within known
[0032] It should be understood that the present application is not limited to the precise structures described above and illustrated in the drawings and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the claims that follow.
Claims
1. A heat transfer tunnel test stand, characterized in that, It comprises centrifugal fan power section, diffusion section, heater, stable section, contraction section, first test section, first corner section, second test section, second corner section, third test section and exhaust diffusion section.
2. A heat transfer tunnel according to claim 1, characterised in that The tunnel structure of the heat transfer wind tunnel test platform is a steel structure.
3. A heat transfer tunnel according to claim 1, wherein The centrifugal fan power section is made of Q235 material.
4. A heat transfer tunnel according to claim 1, wherein The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction.
5. A heat transfer tunnel according to claim 1, wherein The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction.
6. A heat transfer tunnel according to claim 1, wherein The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction.
7. A heat transfer tunnel according to claim 1, wherein The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction.
8. A heat transfer tunnel according to claim 1, wherein The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction. The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction. The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction. The stable section is provided with a honeycomb device and a plurality of layers of damping nets along the airflow direction.