Three-dimensional honeycomb structure for direct-current blowing type low-speed wind tunnel

Abstract

The utility model discloses a three-dimensional honeycomb structure for a direct-current blowing type low-speed wind tunnel, which comprises a honeycomb body, the incoming flow side of the honeycomb body is a concave curved surface, and the outgoing flow side of the honeycomb body is a plane. On the basis of a traditional honeycomb device, the concave curved surface is designed on the incoming flow side of the honeycomb device, the shape and the size of the concave curved surface can be adjusted according to actual requirements, meanwhile, other optimization design can be combined, the flow characteristic of airflow in the honeycomb device can be effectively improved, the uniformity and the stability of a flow field are improved, and the honeycomb device is suitable for being used for a large-scale honeycomb device. Therefore, experimental results are more accurate and reliable, the method can be widely applied to the fields of low-speed wind tunnels and the like, and a more efficient and more accurate airflow control and flow field uniformity improvement scheme is provided for experimental research.

Description

Technical Field

[0001] The utility model relates to the technical field of honeycombs, in particular to a three-dimensional honeycomb structure used in a DC blowing low-speed wind tunnel. Background Art

[0002] Low-speed wind tunnels are experimental equipment used to simulate air flow, and are usually used to test the performance of aircraft, cars, buildings, etc. in low-speed airflow. Low-speed wind tunnels usually use a direct-current blowing structure, which generates airflow through a fan and then evenly distributes and adjusts the airflow speed through a honeycomb.

[0003] A honeycomb is a device with a regular pore structure that can evenly distribute the airflow to the test area and adjust the airflow speed and direction. The smaller the honeycomb aperture and the longer the length, the better the rectification effect, and the corresponding resistance coefficient will also increase, resulting in greater energy loss, less air energy, and lower speed. For some complex experiments with high requirements for airflow distribution and speed regulation, the traditional honeycomb structure has problems such as uneven distribution and inflexible airflow speed regulation.

[0004] The non-uniformity of wind speed in the flow field of a low-speed DC blowing wind tunnel is mainly reflected in the fact that the wind speed in the wind tunnel gradually decreases from the tip to the root of the fan blade. With the continuous development of science and technology and the increase in experimental needs, the performance and precision requirements for low-speed wind tunnels are becoming higher and higher. Therefore, in response to the needs of DC blowing low-speed wind tunnels, a new type of three-dimensional honeycomb structure is needed to better achieve uniform distribution and speed regulation of airflow and improve the experimental accuracy and reliability of low-speed wind tunnels. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the utility model aims to provide a three-dimensional honeycomb structure for a DC blowing low-speed wind tunnel, so as to improve the flow characteristics of the airflow in the honeycomb, improve the uniformity and stability of the flow field, and thus make the experimental results more accurate and reliable.

[0006] In order to achieve the above object, the utility model proposes a three-dimensional honeycomb structure for a DC blowing low-speed wind tunnel, comprising a honeycomb body, wherein the incoming flow side of the honeycomb body is a concave surface, and the outgoing flow side of the honeycomb body is a plane, and the equation of the concave surface is:

[0007]

[0008] H is the maximum length of the honeycomb body in the z direction, h is the minimum length of the honeycomb body in the z direction, R is the radius of the concave surface, (x, y, z) are the coordinates of the concave surface, and the coordinate system takes the center of the plane on the outflow side of the honeycomb body as the origin, wherein the z direction is the axial direction of the honeycomb body.

[0009] In the above scheme: the size of the honeycomb holes of the honeycomb body gradually decreases from the center to the edge, and the flow field distribution of the traditional air-blowing wind tunnel shows a phenomenon that the wind speed increases continuously from the center to the surroundings. A structure with a smaller aperture and a longer length is used at the edge of the honeycomb, while the aperture is correspondingly increased and the length is reduced at the center. In this way, while achieving the same effect, the energy loss of the flow field and the material cost are reduced.

[0010] In the above scheme: the concave surface is a parabola, which is longer at the edge and shorter at the center. The design of this surface is conducive to optimizing the propagation path of the airflow in the honeycomb, so that the airflow can be more evenly distributed to the test area when passing through the honeycomb.

[0011] In the above scheme: the honeycomb body is made by 3D printing technology, and suitable 3D printing materials are selected, usually materials that are resistant to high temperatures, wear and have good mechanical properties, to ensure that the honeycomb can operate stably in the experiment.

[0012] In the above scheme: the honeycomb body includes multiple segmented structures divided along the radial direction, each segmented structure is printed separately, and each segmented structure is assembled into a honeycomb body by slot fitting and glue bonding. The honeycomb body is large in size and cannot be printed in one go by a 3D printer, so segmented printing is adopted.

[0013] The beneficial effects of the utility model are:

[0014] On the basis of the traditional honeycomb, a curved surface was designed on the incoming flow side of the honeycomb to improve the uneven wind speed from the tip to the root of the blade in the flow field of the DC blowing wind tunnel. The flow field distribution of the traditional blowing wind tunnel shows that the wind speed increases continuously from the center to the surroundings. Based on this, the use of traditional solutions to make the flow field meet the uniformity requirements will inevitably use honeycombs with smaller apertures and longer lengths, but at the same time it will lead to increased wind speed losses and increased material costs. Therefore, we proposed to improve the honeycomb, using a longer structure at the edge of the honeycomb and reducing the length at the center accordingly, so that while achieving the same effect, the energy loss of the flow field and the material cost are reduced. The design of this curved surface is intended to optimize the propagation path of the airflow in the honeycomb, so that the airflow can be more evenly distributed to the test area when passing through the honeycomb.

[0015] Specifically, the shape and size of the concave surface can be adjusted and optimized according to the characteristics of different flow fields and experimental requirements. Through this design, the flow characteristics of the airflow in the honeycomb can be effectively improved, and the uniformity and stability of the flow field can be improved, thereby making the experimental results more accurate and reliable. It can be widely used in fields such as low-speed wind tunnels, providing more efficient and precise airflow control and flow field uniformity improvement solutions for experimental research. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, a three-dimensional honeycomb structure for a DC blowing low-speed wind tunnel includes a honeycomb body 1, the inflow side of the honeycomb body 1 is a concave curved surface 2, and the outflow side of the honeycomb body 1 is a plane.

[0019] The equation of the concave surface 2 is:

[0020]

[0021] H is the maximum length of the honeycomb body 1 in the z direction, h is the minimum length of the honeycomb body 1 in the z direction, and R is the radius of the concave surface 2. (x, y, z) are the coordinates of the concave surface, and the coordinate system takes the center of the plane on the outflow side of the honeycomb body 1 as the origin, wherein the z direction is the axial direction of the honeycomb body 1.

[0022] Preferably, the size of the honeycomb holes of the honeycomb body 1 gradually decreases from the center to the edge. The flow field distribution of the traditional air-blowing wind tunnel shows a phenomenon in which the wind speed increases continuously from the center to the surrounding areas. A structure with a smaller aperture and a longer length is used at the edge of the honeycomb, while the aperture is increased and the length is reduced accordingly at the center. In this way, while achieving the same effect, the energy loss of the flow field and the material cost are reduced.

[0023] Preferably, the concave surface 2 is a parabola, which is longer at the edge and shorter at the center. The design of this surface is conducive to optimizing the propagation path of the airflow in the honeycomb, so that the airflow can be more evenly distributed to the test area when passing through the honeycomb.

[0024] Preferably, the honeycomb body 1 is made by 3D printing technology, and suitable 3D printing materials are selected, usually materials that are resistant to high temperatures, wear and have good mechanical properties, to ensure that the honeycomb can operate stably in the experiment.

[0025] Preferably, the honeycomb body 1 includes a plurality of split structures divided radially, each split structure is printed separately, and each split structure is assembled into the honeycomb body 1 by slot fitting and glue bonding. The honeycomb body 1 is relatively large in size, and the 3D printer cannot print it all at once, so a segmented printing method is adopted.

[0026] The manufacturing method of the utility model is:

[0027] Design the concave surface structure: First, according to the experimental requirements and flow field characteristics, design the concave surface structure that needs to be made on the incoming flow side of the honeycomb. Use computer-aided design software to draw the specific shape and size of the concave surface.

[0028] Software modeling: Three-dimensional modeling of the designed concave surface structure is performed, including fusing the concave surface with other parts of the honeycomb to ensure that the concave surface can be seamlessly integrated into the honeycomb structure.

[0029] Select 3D printing materials: Select suitable 3D printing materials according to the experimental requirements and the use environment of the honeycomb. Usually, materials with high temperature resistance, wear resistance and good mechanical properties are selected to ensure that the honeycomb can operate stably in the experiment.

[0030] Complete assembly: Assemble the 3D printed segments together to obtain a three-dimensional honeycomb structure. Perform necessary tests and adjustments to ensure that the overall performance and airflow uniformity of the honeycomb meet the experimental requirements.

Claims

1. A three-dimensional honeycomb structure for a DC blowing low-speed wind tunnel, comprising a honeycomb body (1), characterized in that: The incoming flow side of the honeycomb body (1) is a concave curved surface (2), and the concave curved surface (2) is a parabola. The outgoing flow side of the honeycomb body (1) is a plane, and the equation of the parabola is: H is the maximum length of the honeycomb body (1) in the z direction, h is the minimum length of the honeycomb body (1) in the z direction, and R is the radius of the concave curved surface (2).

2. The three-dimensional honeycomb structure of the DC blowing low-speed wind tunnel according to claim 1 is characterized in that: The size of the honeycomb holes of the honeycomb body (1) gradually decreases from the center to the edge.

3. The three-dimensional honeycomb structure of the DC blowing low-speed wind tunnel according to claim 1 is characterized in that: The honeycomb body (1) is manufactured using 3D printing technology.

4. The three-dimensional honeycomb structure of the DC blowing low-speed wind tunnel according to claim 3 is characterized in that: The honeycomb body (1) comprises a plurality of split structures divided along the radial direction, each split structure is printed separately, and each split structure is assembled into the honeycomb body (1) by fitting in slots and bonding with glue.

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