A wind tunnel device for direct current smoke line tests

Abstract

A DC smoke line test wind tunnel device relates to the technical field of wind tunnel test devices, including a base and an air suction device, wherein a test chamber for placing a test object is provided on the base, and a test space running through left and right is provided in the middle of the test chamber, an air inlet stabilizing section is provided at the air inlet end of the test space, and an air outlet stabilizing section is provided at the air outlet end, a smoke line generating device is provided at the air inlet stabilizing section relative to the inner end of the test chamber, and a rotating device that can drive the test object to rotate and adjust the angle and orientation is provided on the test space, the smoke line generating device generates smoke, and the air suction device drives the smoke straight from the air inlet stabilizing section to the air outlet stabilizing section to form a visible smoke line that can move along the surface of the test object, the present invention forms a horizontal, transverse, and stably flowing smoke line, which passes through the surface of the test object, so that the observer can intuitively and accurately obtain the experimental results of the wind direction flow, and the present invention has a simple and compact structure and high practicality.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel test devices, and in particular to a direct current smoke line test wind tunnel device. Background Art

[0002] Smoke line test wind tunnels are currently mostly used in test areas such as university classrooms and research centers. The test object is placed in the test wind tunnel and a fan is used to draw air from one side of the wind tunnel to the other. A smoke line generating device is set at the starting section. Generally, a heating wire is used. Glycerin seeps from the heating wire from top to bottom. The electric heating causes the glycerin to be atomized into smoke. The smoke drifts with the wind, so that if it passes over the surface of the test object, the smoke line can flow along its surface. Therefore, the observer can intuitively observe the direction of the wind flow on the test object and obtain the experimental results.

[0003] However, at present, general smoke line test wind tunnel devices are large in size, complex in structure, and difficult to operate. In addition, the speed and direction of the flowing wind inside are different, which leads to different speeds and directions of the smoke line. Therefore, due to the uncertainty of the flow of the smoke line, the test results are different. In addition, the current smoke line generating device is generally just an ordinary tensioning structure, which is easy to loosen, causing the heating wire to be skewed, resulting in different smoke generation positions, which also affects the test. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical defects in the prior art of the smoke line test wind tunnel device, that is, the wind flow speed and direction inside the device are different, resulting in uncertainty and instability of the smoke line flow, and the heating wire is not equipped with a tensioning device, which makes the heating wire skew, resulting in differences in test results.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A DC smoke line test wind tunnel device includes a base and an air suction device, wherein a test chamber for placing a test object is provided on the base, a test space running through left and right is provided in the middle of the test chamber, an air inlet steady flow section is provided at the air inlet end of the test space, and an air outlet steady flow section is provided at the air outlet end, a smoke line generating device is provided at the air inlet steady flow section relative to the inner end of the test chamber, a rotating device that can drive the test object to rotate and adjust the angle and orientation is provided on the test space, the smoke line generating device generates smoke, and the air suction device drives the smoke straight from the air inlet steady flow section to the air outlet steady flow section to form a visible smoke line that can move along the surface of the test object.

[0007] Furthermore, the air inlet stabilizing section and the air outlet stabilizing section are symmetrically arranged with respect to the test chamber, and the air inlet stabilizing section and the air outlet stabilizing section have the same structure, and the air inlet stabilizing section includes a honeycomb and a flow equalizing orifice plate arranged at the air inlet end of the test chamber from the outside to the inside.

[0008] Furthermore, the smoke line generating device includes an oil storage box assembly fixedly arranged on the top of the air inlet stabilizing section of the test chamber, an oil accumulation box assembly arranged below the oil storage box assembly, and a plurality of heating wires vertically stretched between the oil storage box assembly and the oil accumulation box assembly. The heating wires are electrically connected to an external power supply, and the oil inside the oil storage box assembly can seep along the upper end to the lower end of the heating wire. During the seepage process, the heating wires are electrically heated to generate smoke for the test.

[0009] Furthermore, the oil storage box assembly includes an oil storage box fixedly arranged on the top of the test chamber, and a plurality of tensioning mechanisms for automatically tensioning the heating wire are arranged inside the oil storage box, and the tensioning mechanism is fixedly connected to the upper end of the heating wire. The oil accumulation box assembly includes an oil accumulation tank fixedly connected to the lower end of the heating wire, and an oil accumulation box for collecting hot oil flowing out of the oil accumulation tank, and the oil accumulation box is fixed in the base.

[0010] Furthermore, the tensioning device includes a fixed plate fixedly arranged on the inner bottom surface of the oil storage box, a seepage column is fixedly and sealedly connected to the fixed plate, a tensioning plate is arranged directly above the fixed plate, the tensioning plate and the fixed plate are adjustably connected by a tensioning bolt, an upper functional plate is fixedly arranged on the top of the tensioning plate, a through hole is provided on the tensioning plate, one end of the heating wire is fixed on the upper functional plate, and the other end passes through the through hole and the seepage column in sequence to extend to the oil accumulation box assembly, and a fine hole for the heating wire to pass through is provided in the center of the seepage column.

[0011] Furthermore, a lower functional plate for fixing the lower end of the heating wire is fixedly provided at the bottom of the oil accumulation tank, and a flow hole for conveying the accumulated oil to the oil accumulation box is provided on one side of the oil accumulation tank.

[0012] Furthermore, an output hole is provided at the bottom end of the oil accumulation box, and the output hole is connected to the oil accumulation tank through a pipeline. The oil accumulation tank is fixedly arranged in the base, and heat dissipation holes are provided on both sides of the oil accumulation box.

[0013] Furthermore, the rotating device includes a rotating plate and a rotating motor arranged in the base for driving the rotating plate to rotate, and the rotating motor is fixed in the base through a motor fixing frame.

[0014] Furthermore, an air inlet guide cover is provided on the outside of the air inlet stabilizing section, and an air outlet guide cover is provided on the outside of the air outlet stabilizing section. The air suction device includes an air supply pipe connected to the air outlet guide cover at one end, and an air supply fan arranged in the air supply pipe.

[0015] Furthermore, the front and upper sides of the test chamber are provided with observation windows for easily observing the flow of internal smoke lines.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention proposes a direct current smoke line test wind tunnel device, which is provided with a test chamber on a base, an air inlet stabilizing section at the air inlet end of the test chamber, an air outlet stabilizing section, a smoke line generating device, a rotating device, and an air suction device at the air outlet end. When in use, a test object is placed on the rotating device and rotated to a required orientation and angle, smoke is generated by the smoke line generating device, and the wind flows through the air inlet stabilizing section to generate horizontal, lateral, and stable wind, driving the smoke to flow from the air inlet side to the air outlet side, forming a horizontal, lateral, and stable flowing smoke line, and the smoke line passes through the surface of the test object and the contour of the test object surface, thus forming a visible wind direction flow, so that the observer can intuitively and accurately obtain the experimental results of the wind direction flow. The present invention has a simple and compact structure and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 3 A schematic diagram of the three-dimensional structure of the present invention from another perspective;

[0022] Figure 4 A schematic diagram of the three-dimensional structure of the present invention from another perspective;

[0023] Figure 5 This is a schematic structural diagram of the smoke line generating device of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the smoke line generating device of the present invention;

[0025] Figure 7 This is a schematic structural diagram of the oil accumulation box of the present invention;

[0026] Figure 8 for Figure 6 A partial enlarged view of .

[0027] In the figure: 1. Base, 11. Oil accumulation tank, 2. Air inlet guide cover, 3. Air inlet steady flow section, 31. Honeycomb, 32. Flow equalizing orifice plate, 4. Smoke line generating device, 41. Oil storage box, 411. Fixing plate, 412. Seepage column, 413. Tensioning bolt, 415. Tensioning plate, 416. Through hole, 417. Upper functional plate, 42. Cover, 43. Handle, 44. Heating wire, 45. Oil accumulation tank, 46. Oil accumulation box, 461. Heat dissipation hole, 462. Output hole, 47. Flow delivery hole, 48. Lower functional plate, 5. Rotating device, 51. Rotating motor, 52. Rotating plate, 53. Motor fixing bracket, 6. Test chamber, 7. Air outlet steady flow section, 8. Air outlet guide cover, 9. Air supply pipe, 91. Air supply fan. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the elevator guide rail fixing structure of the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] like Figure 1-8 As shown, a DC smoke line test wind tunnel device includes a base 1 and a suction device, the base 1 is provided with a test chamber 6 for placing the test object, the middle of the test chamber 6 is provided with a test space running through left and right, the air inlet end of the test space is provided with an air inlet steady flow section 3, the air outlet end is provided with an air outlet steady flow section 7, the air inlet steady flow section 3 is provided with a smoke line generating device 4 relative to the inner end of the test chamber 6, the test space is provided with a rotating device 5 that can drive the test object to rotate and adjust the angle and orientation, the smoke line generating device 4 generates smoke, and the suction device drives the smoke from the air inlet steady flow section straight to the air outlet steady flow section to form a visible smoke line that can move along the surface of the test object.

[0032] The present invention proposes a direct current smoke line test wind tunnel device, which is provided with a test chamber 6 on a base 1, an air inlet steady flow section 3 is provided at the air inlet end of the test chamber 6, an air outlet steady flow section 7, a smoke line generating device, a rotating device, and an air suction device are provided at the air outlet end. When in use, the test object is placed on the rotating device and rotated to a required orientation and angle, smoke is generated by the smoke line generating device, and the wind flows through the air inlet steady flow section 7 to generate horizontal, lateral, stable wind, driving the smoke to flow from the air inlet side to the air outlet side, forming a horizontal, lateral, stable flowing smoke line, passing through the surface of the test object and the smoke line of the surface contour of the test object, that is, forming a visible wind direction flow, so that the observer can intuitively and accurately obtain the experimental results of the wind direction flow. The present invention has a simple and compact structure and high practicality.

[0033] Specifically, as shown in the figure, the inlet stabilizing section 3 and the outlet stabilizing section 7 are symmetrically arranged about the test chamber 6. The inlet stabilizing section 3 and the outlet stabilizing section 7 have the same structure, comprising a honeycomb 31 and a flow balancing orifice 32 spaced from the outside to the inside at the air inlet end of the test chamber 6. By symmetrically arranging the stabilizing sections, synchronous stabilization of the inlet and outlet airflow is achieved, resulting in more stable internal airflow and, consequently, a more stable smoke line flow, resulting in better experimental results.

[0034] Specifically, as shown in the figure, the smoke line generating device includes an oil storage box assembly fixedly mounted on the top of the air inlet stabilizing section 3 of the test chamber 6, an oil accumulation box assembly disposed below the oil storage box assembly, and a plurality of heating wires 44 vertically stretched between the oil storage box assembly and the oil accumulation box assembly. The heating wires 44 are electrically connected to an external power source. The oil inside the oil storage box assembly can flow from the upper end to the lower end of the heating wires 44. During the flow, the heating wires are electrically heated to generate smoke for testing. During use, glycerin is pre-set in the oil storage box assembly. The glycerin flows from top to bottom along the heating wires and is atomized into smoke through heating. The smoke flows with the internal airflow to form a smoke line. The unatomized glycerin flows into the oil accumulation box assembly directly below for storage and recycling.

[0035] Specifically, as shown in the figure, the oil storage box assembly includes an oil storage box 41 fixedly arranged on the top of the test chamber 6, and a plurality of tensioning mechanisms for automatically tensioning the heating wire 44 are arranged inside the oil storage box 41. The tensioning mechanism is fixedly connected to the upper end of the heating wire 44. The oil accumulation box assembly includes an oil accumulation groove 45 fixedly connected to the lower end of the heating wire 44, and an oil accumulation box 46 for collecting hot oil flowing out of the oil accumulation groove 45. The oil accumulation box 46 is fixed in the base 1. The tensioning mechanism includes a fixed plate 411 fixedly arranged on the inner bottom surface of the oil storage box 41, and a seepage column 412 is fixedly and sealedly connected to the fixed plate 411. A tensioning plate 415 is arranged directly above the fixed plate 411, and the tensioning plate 415 and the fixed plate 411 are adjustably connected by a tensioning bolt 413. An upper functional plate 417 is fixedly arranged on the top of the tensioning plate 415, and a through hole 416 is opened on the tensioning plate 415. One end of the heating wire 44 is fixed on the upper functional plate 417, and the other end passes through the through hole 416 and the seepage column 412 in sequence to extend to the oil accumulation box assembly. A fine hole 418 for the heating wire 44 to pass through is provided in the center of the seepage column 412.

[0036] By setting up a tensioning mechanism, the heating wire is kept in a tensioned state at all times. During implementation, the oil storage box 46 is set to a structure that can be flipped open to add glycerin, including an oil storage box 41, a cover body 42 and a handle 43. When in use, the cover body 42 can be easily opened by the handle to add glycerin. The glycerin seeps downward from the heating wire 44 and seeps from top to bottom through the central hole 418 of the seepage column 412. When the heating wire 44 becomes skewed, the tension of the heating wire 44 can be adjusted by adjusting the tensioning bolt 413.

[0037] Specifically, as shown in the figure, a lower functional plate 48 for fixing the lower end of the heating wire 44 is fixedly provided at the bottom of the oil accumulation groove 45, and a flow hole 47 for conveying the accumulated oil to the oil accumulation box 46 is provided on one side of the oil accumulation groove 45.

[0038] Specifically, as shown in the figure, an output hole 462 is provided at the bottom end of the oil accumulation box 46, and the output hole 462 is connected to the oil accumulation tank 11 through a pipeline. The oil accumulation tank 11 is fixedly arranged in the base 1, and heat dissipation holes 461 are provided on both sides of the oil accumulation box 46.

[0039] Specifically, as shown in the figure, the rotating device 5 includes a rotating plate 52 and a rotating motor 51 provided in the base 1 for driving the rotating plate 52 to rotate. The rotating motor 51 is fixed in the base 1 through a motor fixing bracket 53.

[0040] Specifically, as shown in the figure, an air inlet guide 2 is provided on the outside of the air inlet stabilizing flow section 3, and an air outlet guide 8 is provided on the outside of the air outlet stabilizing flow section 7. The air suction device includes an air supply pipe 9 connected to the air outlet guide 8 at one end, and an air supply fan 91 provided in the air supply pipe 9. The provision of the air inlet guide 2 and the air outlet guide 8 allows the air inlet and outlet to pass through the tapered guide before passing through the stabilizing flow section, thereby increasing the stability of the airflow.

[0041] Specifically, as shown in the figure, the front side and the upper side of the test chamber 6 are provided with observation windows 61 for observing the flow of internal smoke lines.

[0042] Specifically, the present invention operates as follows: Under the suction action of the air supply fan 91, ambient air passes through the inlet shroud 2, where it is gradually deflected and rectified. It then passes through a flow-balancing and stabilizing section equipped with a honeycomb 31 and a flow-balancing orifice plate 32, where it is evenly distributed and rectified, before being smoothly delivered to the test chamber 6, which houses the smoke line generator. Within the smoke line generator, smoke oil (glycerin) from the top oil reservoir slowly and evenly flows through the outer surface of a preloaded heating wire through fine pores until it returns to the oil reservoir. Electricity heats the oil on the heating wire, generating smoke, which is carried away by the passing air, forming a beautiful, straight smoke line across the entire cross-section. When the smoke line enters the test section, it encounters an obstruction placed on a rotating turntable. After detouring, it forms a well-defined flow pattern within the test section, clearly visible to the naked eye. The smoke line then enters the outlet stabilizing section, where the smoke is further regulated, aligning the inlet and outlet air of the test section, reducing obstructions and ensuring smoother airflow. Finally, the smoke passes through the fan and is discharged outdoors through the air supply duct. The flue gas flow rate and the rotation of the rotating disk can be freely adjusted, making the test smoke line closer to natural wind, which has high scientific research reference value. This invention has great practical application value: it provides significant scientific research support for pollutant diffusion research, building thermal environment research, and human living comfort environment research.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0044] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A DC smoke line test wind tunnel device, comprising a base (1) and an air suction device, characterized in that: The base (1) is provided with a test chamber (6) for placing the test object, and a test space that is through-through to the left and right is provided in the middle of the test chamber (6). The air inlet end of the test space is provided with an air inlet steady flow section (3), and the air outlet end is provided with an air outlet steady flow section (7). The air inlet steady flow section (3) is provided with a smoke line generating device (4) at the inner end relative to the test chamber (6). The test space is provided with a rotating device (5) that can drive the test object to rotate and adjust the angle and orientation. The smoke line generating device (4) generates smoke, and the air suction device drives the smoke from the air inlet steady flow section straightly to the air outlet steady flow section to form a visible smoke line that can move along the surface of the test object. The air inlet steady flow section (3) and the air outlet steady flow section (7) are symmetrically arranged with respect to the test chamber (6); the air inlet steady flow section (3) and the air outlet steady flow section (7) have the same structure; the air inlet steady flow section comprises a honeycomb (31) and a flow balancing orifice plate (32) arranged at an air inlet end of the test chamber (6) from outside to inside; The smoke line generating device comprises an oil storage box assembly fixedly arranged on the top of the air inlet steady flow section (3) of the test chamber (6), an oil accumulation box assembly arranged below the oil storage box assembly, and a plurality of heating wires (44) vertically stretched between the oil storage box assembly and the oil accumulation box assembly, wherein the heating wires (44) are electrically connected to an external power supply, and the oil inside the oil storage box assembly can seep along the upper end to the lower end of the heating wires (44), and the heating wires are electrically heated during the seepage process to generate smoke for the test; The oil storage box assembly includes an oil storage box (41) fixedly arranged on the top of the test chamber (6), and a plurality of tensioning mechanisms for automatically tensioning the heating wire (44) are arranged inside the oil storage box (41), and the tensioning mechanisms are fixedly connected to the upper end of the heating wire (44); The tensioning mechanism includes a fixed plate (411) fixedly arranged on the inner bottom surface of the oil storage box (41), a seepage column (412) is fixedly and sealedly connected to the fixed plate (411), a tensioning plate (415) is arranged directly above the fixed plate (411), the tensioning plate (415) and the fixed plate (411) are adjustably connected via a tensioning bolt (413), an upper functional plate (417) is fixedly arranged on the top of the tensioning plate (415), a through hole (416) is provided on the tensioning plate (415), one end of the heating wire (44) is fixed on the upper functional plate (417), and the other end passes through the through hole (416) and the seepage column (412) in sequence to extend toward the oil accumulation box assembly, and a fine hole (418) for the heating wire (44) to pass through is provided at the center of the seepage column (412).

2. A DC smoke line test wind tunnel device according to claim 1, characterized in that: The oil accumulation box assembly comprises an oil accumulation groove (45) fixedly connected to the lower end of the heating wire (44), and an oil accumulation box (46) for collecting hot oil flowing out of the oil accumulation groove (45), wherein the oil accumulation box (46) is fixed in the base (1); A lower functional plate (48) for fixing the lower end of the heating wire (44) is fixedly provided at the bottom of the oil accumulation groove (45), and a flow hole (47) for conveying the accumulated oil to the oil accumulation box (46) is provided on one side of the oil accumulation groove (45); The front and upper sides of the test chamber (6) are provided with observation windows (61) for conveniently observing the flow of internal smoke lines.

3. A DC smoke line test wind tunnel device according to claim 2, characterized in that: An output hole (462) is provided at the bottom end of the oil accumulation box (46), and the output hole (462) is connected to the oil accumulation tank (11) through a pipeline. The oil accumulation tank (11) is fixedly arranged in the base (1). Heat dissipation holes (461) are provided on both sides of the oil accumulation box (46).

4. A DC smoke line test wind tunnel device according to claim 2, characterized in that: The rotating device (5) comprises a rotating plate (52), a rotating motor (51) arranged in the base (1) for driving the rotating plate (52) to rotate, and the rotating motor (51) is fixed in the base (1) via a motor fixing frame (53).

5. The DC smoke line test wind tunnel device according to claim 1, characterized in that: An air inlet guide cover (2) is provided on the outside of the air inlet steady flow section (3), an air outlet guide cover (8) is provided on the outside of the air outlet steady flow section (7), and the air suction device comprises an air supply pipe (9) connected to the air outlet guide cover (8) at one end, and an air supply fan (91) provided in the air supply pipe (9).

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