Cooling section of meteorological loop wind tunnel

Abstract

The utility model provides a cooling section of a meteorological loop wind tunnel, which comprises a cooling cavity positioned in the loop wind tunnel, a water injection port arranged at the bottom of the cooling cavity, a water outlet arranged at the top of the cooling cavity and used for continuously adding cooling liquid; the multiple cooling pipes are evenly distributed in the cooling cavity, the two ends of each cooling pipe penetrate out of the side wall of the cooling cavity, one end of each cooling pipe faces the air inlet side of the cooling cavity, and the other end of each cooling pipe faces the air outlet side of the cooling cavity; the cooling pipe is formed by sequentially communicating multiple special-shaped pipelines, each special-shaped pipeline comprises a diffusion pipe and a contraction pipe, the diameter of each special-shaped pipeline is smaller than that of the diffusion pipe, the special-shaped pipelines are connected to the tail of the diffusion pipe, and the diffusion pipe is in smooth transition connection with the contraction pipe. According to the technical characteristics, the diameter of the pipe body is repeatedly changed through the diffusion pipe and the shrinkage pipe, so that the flowing speed of the air body is changed, the air body collides with the inner wall of the cooling pipe in a reciprocating mode, the contact frequency is improved, the heat exchange efficiency of the air body is also improved, and the heat dissipation efficiency of the air body is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind tunnels, in particular to a cooling section of a meteorological closed-circuit wind tunnel. BACKGROUND

[0002] A closed-circuit wind tunnel is a special wind tunnel facility, which is characterized in that the air flow circulates in a closed loop. It generally comprises a driving section, a diffuser section, a test section and a return section. These sections are connected end to end to form a closed annular channel. Compared with an open-circuit wind tunnel, the closed-circuit wind tunnel has the advantage of providing stable and repeatable air flow conditions in a relatively small space.

[0003] During the operation of the closed-circuit wind tunnel, the temperature in the annular space increases due to factors such as friction with experimental devices or energy conversion during the test. Therefore, a cooling section is provided in the closed-circuit wind tunnel, which is generally located at the end of the diffuser section. The common cooling section can be air-cooled or water-cooled, which transfers the heat in the air outside the closed-circuit wind tunnel through heat conversion.

[0004] However, due to the structure of the closed-circuit wind tunnel, the length of the cooling section is limited, and the length of the cooling section affects the contact time and transfer efficiency of the hot air and the heat transfer mechanism inside the cooling section. Therefore, it is particularly important to improve the heat transfer efficiency of the cooling section per unit length. SUMMARY

[0005] In view of the problems existing in the prior art, the present application provides a cooling section of a meteorological closed-circuit wind tunnel, which comprises: a cooling cavity located in the closed-circuit wind tunnel, one end of which faces the air inlet side of the closed-circuit wind tunnel, and the other end faces the air outlet side of the closed-circuit wind tunnel; a water inlet is arranged at the bottom of the cooling cavity, and a water outlet is arranged at the top of the cooling cavity for continuously adding cooling liquid; a plurality of cooling pipes are arranged in the cooling cavity and are uniformly distributed, both ends of each cooling pipe pass through the side wall of the cooling cavity, one end of each cooling pipe faces the air inlet side of the cooling cavity, and the other end of each cooling pipe faces the air outlet side of the cooling cavity; the cooling pipes are connected by a plurality of special-shaped pipes, the special-shaped pipes comprise a diffuser pipe and a contraction pipe, the diameter of the contraction pipe is smaller than that of the diffuser pipe and is connected to the tail of the diffuser pipe, and the diffuser pipe and the contraction pipe are connected smoothly; adjacent special-shaped pipes are connected smoothly. Through the above technical features, the cooling pipe is used for conveying the flow of air, and the diameter of the pipe body is repeatedly changed through the diffuser pipe and the contraction pipe, so that the flow rate of the air body is changed, the air body repeatedly collides on the inner wall of the cooling pipe, the contact frequency is improved, and the heat exchange efficiency of the air body is improved, thereby greatly improving the heat dissipation efficiency of the air body.

[0006] In some embodiments, an independent pipe is arranged outside each cooling pipe, the independent pipe is arranged along the length direction of the cooling pipe, a gap is left between the independent pipe and the cooling pipe, one end of all the independent pipes is connected to a water supply cavity, the other end of all the independent pipes is connected to a water discharge cavity, and the water supply cavity and the water discharge cavity are located in the cooling cavity. Thus, the water supply cavity supplies cooling water into the interlayer of each independent pipe and the cooling pipe, and drives the liquid to flow at high speed in the independent pipe. Compared with the cooling liquid in the cooling cavity, the heat conversion efficiency is higher. Moreover, the excess heat can be transferred to the cooling liquid in the cooling cavity through the independent pipe, further improving the heat conversion efficiency.

[0007] In some embodiments, a plurality of spiral vanes are arranged in the cooling pipe, the spiral vanes are distributed from the air inlet end to the air outlet end of the cooling pipe, so that a central bundled air duct and a peripheral spiral air duct are formed in the cooling pipe. Thus, the spiral vanes form the spiral air duct, increase the contact range of the peripheral air with the inner wall of the cooling pipe, and improve the heat conversion efficiency. Moreover, the spiral vanes extend to the central part of the cooling pipe, accelerating the temperature transfer. The air flowing in the central part has less resistance, and can exchange heat with the environment. The air in the peripheral spiral air duct is affected by the high-speed airflow in the central part, and is gathered to the central part during the flow process, accelerating the heat transfer. Moreover, the reciprocating change of the inner diameter of the spiral air duct forms the contraction and diffusion of the air flow, accelerating the heat exchange efficiency.

[0008] In some embodiments, a plurality of limiting heat dissipation plates are reversely distributed along the length of the inner wall of the independent pipe, one side edge of the limiting heat dissipation plate is fixedly connected to the inner wall of the independent pipe, adjacent limiting heat dissipation plates are arranged at intervals, and are uniformly distributed along the peripheral side of the independent pipe. Thus, the limiting heat dissipation plates increase the contact range with the liquid, improve the heat transfer efficiency, and the plurality of limiting heat dissipation plates limit the flow direction of the liquid, making the liquid flow more efficient and the heat transfer efficiency higher.

[0009] In some embodiments, the other side edge of the limiting heat dissipation plate extends to the outer wall of the cooling pipe, and is fixedly connected to the outer wall of the cooling pipe. Thus, the limiting heat dissipation plate plays a role in assisting the support of the cooling pipe, avoiding the vibration caused by the impact of the reciprocating change of the inner diameter of the air in the pipe wall on the pipe body. Moreover, the limiting heat dissipation plate is directly connected to the cooling pipe and the independent pipe, can timely transfer the heat carried on the cooling pipe, accelerate the heat transfer efficiency, and limit the flow direction of the liquid cooling liquid on the peripheral side of the cooling pipe, improving the heat transfer efficiency.

[0010] In some embodiments, the water supply cavity is provided with an external independent water supply water inlet, and the water drainage cavity is provided with a water outlet for leading water out of the external environment. Thus, the cooling water in the water supply cavity and the cooling water in the cooling cavity are independent and do not communicate with each other. Since the cooling liquid in the independent pipe is adjacent to the hot air, the heat transfer efficiency is ensured by limiting the flow space and flow rate, and the external environment is adjacent to the cooling liquid in the cooling cavity, thereby improving the regional heat preservation capacity.

[0011] In some embodiments, the independent pipe is coaxially arranged with the cooling pipe. Thus, the uniformity of the flow of the cooling liquid in the independent pipe is ensured, the flow disturbance phenomenon caused by the non-uniform flow rate due to the flow space is avoided, and the stable heat carrying efficiency is ensured.

[0012] In some embodiments, the water supply cavity is located on one side of the cooling pipe outlet, and the water drainage cavity is located on one side of the cooling pipe air inlet. Thus, when the hot air enters the air inlet of the cooling pipe, it is affected by the ambient temperature and exchanges heat, and its own heat gradually decreases. Although the cooling liquid in the independent pipe on the side is at the end, it flows at a high speed and transfers out of the cooling cavity, so that the heat can be transferred to the outside of the cooling cavity in time. As the air flows to the end of the cooling pipe, the side is filled with fresh cooling liquid, and the cooling efficiency is higher, thereby accelerating the cooling efficiency of the air itself.

[0013] It should be understood that the content described in the summary is not intended to limit the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The overall structure of the cooling section of the meteorological return circuit wind tunnel is shown.

[0015] Figure 2 The structure of a single cooling pipe in the cooling section of the meteorological return circuit wind tunnel is shown.

[0016] Figure 3 The internal structure of the cooling pipe in the cooling section of the meteorological return circuit wind tunnel is shown.

[0017] Figure 4 The cross-sectional structure of the cooling pipe in the cooling section of the meteorological return circuit wind tunnel is shown.

[0018] Figure 5 The structure of the cooling pipe on the side of the cooling section of the meteorological return circuit wind tunnel is shown.

[0019] Figure 6 A cooling section side sectional view of a meteorological circuit wind tunnel is shown in the embodiment of the utility model;

[0020] Figure 7 A cooling tube peripheral side structure sectional view in a cooling section of a meteorological circuit wind tunnel is shown in the embodiment of the utility model;

[0021] Figure 8 A cooling tube peripheral side structure sectional view is shown in another embodiment of the utility model.

[0022] Symbol explanation

[0023] 1, cooling cavity; 2, cooling pipe; 21, diffusion pipe; 22, contraction pipe; 3, spiral blade; 41, cluster air duct; 42, spiral air duct; 5, independent pipe; 51, water supply cavity; 52, drainage cavity; 6, limit heat dissipation plate. DETAILED DESCRIPTION

[0024] Next, preferred embodiments (or implementation manners) of the present application will be described in detail in combination with the drawings.

[0025] Next, preferred embodiments (or implementation manners) of the present application will be described in detail in combination with the drawings. Figures 1-8 A meteorological circuit wind tunnel cooling section is shown in the new type of book.

[0026] Figure 1 A schematic diagram of the overall structure of a meteorological circuit wind tunnel cooling section is shown in the embodiment of the utility model. As shown in the figure, Figure 1 The cooling section of the meteorological circuit wind tunnel provided by the embodiment includes a cooling cavity 1. The cooling cavity 1 can be a cavity with a rectangular cross section or a cavity with a circular cross section. The specific setting can be made according to the position area of the cooling cavity 1. The purpose is to be installed in the air duct of the circuit wind tunnel and to shield the air flowing in the air duct. One side of the cooling cavity 1 is the air inlet side, and the side opposite to the air inlet side is the air outlet side. A plurality of cooling pipes 2 are densely arranged in the cooling cavity 1 from the air inlet side to the air outlet side. The cooling pipes 2 connect the air inlet side and the air outlet side of the cooling cavity 1 with each other, so that the air flowing in the circuit wind tunnel can only be transported through a single path of the cooling pipes 2.

[0027] The bottom of the cooling cavity 1 is provided with a water inlet that is in communication with the external environment, and the top of the cooling cavity 1 is provided with a water outlet that is in communication with the external environment. The cooling liquid can be pumped into the cooling cavity 1 by a pump body, so that the cooling liquid circulates and flows, thereby ensuring the overall temperature environment inside the cooling cavity 1. The temperature of the cooling liquid can be adjusted according to the wind speed of the circuit wind tunnel, the test purpose and other factors, so that the air passing through the cooling section can reach the set test parameters.

[0028] Figure 2A structure diagram of a single cooling pipe 2 in a cooling section of a meteorological return circuit wind tunnel is shown. Figure 2 As shown, the cooling pipe 2 is a long straight pipe body, which is connected by a plurality of special-shaped pipes. Among them, the special-shaped pipes include a diffusion pipe 21 and a contraction pipe 22, the diffusion pipe 21 and the contraction pipe 22 are both pipe bodies with circular cross sections, the diameter of the contraction pipe 22 is smaller than that of the diffusion pipe 21, one end of the contraction pipe 22 is coaxially fixed to the tail of the diffusion pipe 21, and the connection of the diffusion pipe 21 and the contraction pipe 22 is smooth, and the connection of adjacent special-shaped pipes is also smooth, thereby playing a guiding role on the air passing through it. In the process of high-speed flow of air in the cooling pipe 2, the diameter of the cooling pipe 2 changes, which also changes the speed of air flow, and repeatedly contacts the inner wall of the cooling pipe 2, thereby prolonging the residence time of air in the cooling pipe 2, easily affected by the ambient temperature in the cooling cavity 1, and accelerating the cooling efficiency of air.

[0029] Figure 3 A structure diagram of a single cooling pipe 2 in a cooling section of a meteorological return circuit wind tunnel is shown, Figure 4 A structure diagram of a single cooling pipe 2 in a cooling section of a meteorological return circuit wind tunnel is shown. Reference Figure 3 And Figure 4 As shown, in some embodiments, a plurality of spiral blades 3 are arranged in the cooling pipe 2 from the air inlet end to the air outlet end, one side edge of the spiral blade 3 is fixed to the inner wall of the cooling pipe 2, so that a central bundled air duct 41 and a spiral air duct 42 close to the inner wall of the cooling pipe 2 are formed when viewed from the cross section of the cooling pipe 2. When air flows at high speed in the cooling pipe 2, the flow rate in the bundled air duct 41 is fast due to less resistance; the spiral air duct 42 prolongs the air flow path and also makes the air fully contact with the inner wall of the cooling pipe 2, increases the heat conversion efficiency, and the change of the internal environment of the cooling pipe 2 also plays a guiding role on the air in the spiral air duct 42, thereby also driving the air to gather in the bundled air duct 41, accelerating the exchange between the air, and further improving the heat transfer efficiency.

[0030] Figure 5 A structure diagram of a single cooling pipe 2 in a cooling section of a meteorological return circuit wind tunnel is shown. Reference Figure 5As shown in the drawings, in some embodiments, each cooling pipe 2 is provided with an independent pipe 5 located in the middle region of the cooling cavity 1, one end of the independent pipe 5 is provided with a water supply cavity 51, the other end of the independent pipe 5 is provided with a water drainage cavity 52, the water supply cavity 51 and the water drainage cavity 52 are located in the cooling cavity 1, and each independent pipe 5 is connected and communicated with the water supply cavity 51 and the water drainage cavity 52. The two ends of the cooling cavity 1 pass through the water supply cavity 51 and the water drainage cavity 52 and are not communicated with the water supply cavity 51 and the water drainage cavity 52.

[0031] Figure 6 A cooling section side sectional view of a meteorological circuit wind tunnel is shown in the embodiment of the utility model. Referring to Figure 6 As shown in the drawings, the water supply cavity 51 is provided with an independent water supply interface, and the water drainage cavity 52 is provided with an independent water drainage interface. The water supply cavity 51 can supply cooling water independently. The cooling water is supplied to each independent pipe 5 from the water supply cavity 51, enters the gap between the independent pipe 5 and the cooling pipe 2 at high speed, transfers and concentrates the heat on the cooling pipe 2 to the water drainage cavity 52, and is finally discharged to the external environment. Since the liquid in the cooling cavity 1 is in contact with each cooling pipe 2 at the same time and in the same space, although it is in a flowing state, the local temperature may rise due to the slow circulation of the cooling water. Therefore, the independent cooling water supply in the independent pipe 5 can timely carry and transfer the heat, thereby accelerating the heat transfer efficiency.

[0032] In some embodiments, the independent pipe 5 is coaxially arranged with the cooling pipe 2, so that the gap between the independent pipe 5 and the cooling pipe 2 is more uniform, avoiding the influence of uneven gap on the flow rate of the cooling water and affecting the flow efficiency of the cooling water in the independent pipe 5. In order to ensure the overall heat exchange efficiency in the cooling cavity 1, the water supply cavity 51 is located on one side of the air outlet end of the cooling pipe 2, and the water drainage cavity 52 is located on one side of the air inlet end of the cooling pipe 2, so that the air entering the front end of the cooling pipe 2 is affected by the overall temperature environment of the cooling cavity 1, thereby cooling the air. As the air enters the end of the cooling pipe 2, the fresh cooling water ensures the cooling efficiency of the air outlet side of the cooling cavity 1.

[0033] Figure 7 A cooling pipe 2 peripheral side structure sectional view of a cooling section of a meteorological circuit wind tunnel is shown in the embodiment of the utility model. Referring to Figure 7 As shown in the drawings, in some embodiments, the inner wall of the independent pipe 5 is provided with a plurality of limiting heat dissipation plates 6 along the length direction thereof, the limiting heat dissipation plates 6 are uniformly distributed along the peripheral side of the independent pipe 5, and one side of each limiting heat dissipation plate 6 is fixedly connected with the inner wall of the independent pipe 5. During the flow of the cooling liquid in the independent pipe 5, the limiting heat dissipation plates 6 limit the flow path of the cooling liquid and increase the contact range with the cooling liquid, which is beneficial to transferring the heat of the cooling liquid to the independent pipe 5 and dispersing and carrying the heat.

[0034] Figure 8 The cooling pipe 2 is shown in the structure of the other embodiment of the utility model. Referring to Figure 8 As shown in the figure, in some embodiments, the other side edge of the limiting heat dissipation plate 6 extends to the edge of the cooling pipe 2 and is fixedly connected with the outer wall of the cooling pipe 2, so that a plurality of independent water channels are formed between the independent pipe 5 and the edge of the cooling pipe 2, while limiting drainage, the limiting heat dissipation plate 6 can timely carry and transfer the heat on the cooling pipe 2 and transfer to the cooling liquid and the independent pipe 5, thereby greatly increasing the efficiency of heat transfer.

[0035] The cooling pipe 2, the independent pipe 5, the limiting heat dissipation plate 6 and the spiral blade 3 are all copper material pipe or plate, because the thermal conductivity of copper is high, the heat passing through the unit area per unit time is more under the unit temperature gradient, which can quickly transfer the heat, thereby ensuring the overall cooling efficiency of the cooling section.

[0036] In the description of the present application, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling section for a meteorological loop wind tunnel, characterized in that, include: The cooling chamber (1) is located inside the loop wind tunnel, with one end facing the air inlet side of the loop wind tunnel and the other end facing the air outlet side of the loop wind tunnel. It has a water inlet at the bottom and a water outlet at the top for continuously adding cooling liquid; Multiple cooling pipes (2) are arranged evenly within the cooling chamber (1). Each cooling pipe (2) extends through the side wall of the cooling chamber (1) at both ends, with one end facing the air inlet side and the other end facing the air outlet side. Each cooling pipe (2) is formed by connecting multiple sets of irregularly shaped pipes sequentially. The irregularly shaped pipes include… Diffuser tube (21), A contraction tube (22) with a smaller diameter than the diffuser tube (21) is connected to the tail of the diffuser tube (21), and the diffuser tube (21) and the contraction tube (22) are smoothly connected. The adjacent irregularly shaped pipes are smoothly connected.

2. The cooling section of a meteorological loop wind tunnel according to claim 1, characterized in that, Each of the cooling pipes (2) has an externally arranged... Independent pipe (5) is arranged along the length of cooling pipe (2). There is a gap between independent pipe (5) and cooling pipe (2). One end of all independent pipes (5) is connected to a water supply chamber (51). The other end of all independent pipes (5) is connected to a drain chamber (52). Both water supply chamber (51) and drain chamber (52) are located in the cooling chamber (1).

3. The cooling section of a meteorological loop wind tunnel according to claim 2, characterized in that, The cooling pipe (2) is provided with multiple spiral blades (3), which are distributed from the air inlet end to the air outlet end of the cooling pipe (2), so that a central cluster air duct (41) and a peripheral spiral air duct (42) are formed in the cooling pipe (2).

4. The cooling section of a meteorological loop wind tunnel according to claim 2, characterized in that, The inner wall of the independent tube (5) has multiple limiting heat dissipation plates (6) distributed in the opposite direction along its length. One side edge of the limiting heat dissipation plate (6) is fixedly connected to the inner wall of the independent tube (5). Adjacent limiting heat dissipation plates (6) are spaced apart and evenly distributed along the periphery of the independent tube (5).

5. The cooling section of a meteorological loop wind tunnel according to claim 4, characterized in that, The other side edge of the limiting heat dissipation plate (6) extends toward the outer wall of the cooling pipe (2) and is fixedly connected to the outer wall of the cooling pipe (2).

6. The cooling section of a meteorological loop wind tunnel according to claim 2, characterized in that, The water supply chamber (51) is provided with an inlet for independent external water supply, and the drainage chamber (52) is provided with an outlet for leading water out of the external environment.

7. The cooling section of a meteorological loop wind tunnel according to claim 2, characterized in that, The independent pipe (5) is coaxially arranged with the cooling pipe (2).

8. The cooling section of a meteorological loop wind tunnel according to claim 2, characterized in that, The water supply chamber (51) is located on one side of the outlet of the cooling pipe (2), and the drain chamber (52) is located on one side of the air inlet of the cooling pipe (2).

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