Wind tunnel rack
The modular wind tunnel test bench enables high-precision and low-cost grid leakage rate testing under laboratory conditions, solving the problems of test results being limited by the external environment and high cost in existing technologies, and providing a grid testing solution applicable to multiple scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU SUBO TESTING TECH SERVICE CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-05
AI Technical Summary
Existing technologies cannot simultaneously collect pressure and flow data based on simulated real wind speeds, lack a quantitative basis for calculating grid leakage rates, and test results are limited by external environment and equipment conditions. They are costly, time-consuming, and lack small, universal testing devices, making it difficult to meet the needs of rapid development and evaluation of diverse components.
A modular wind tunnel rig was designed, including a duct, a cone-shaped shroud, an air supply assembly, and a testing assembly. It uses a blower that simulates real vehicle speed and precision sensors, adjusts the wind speed through a frequency converter, and combines a differential pressure conversion algorithm to achieve high-precision leakage rate calculation, supporting multi-scenario deployment and rapid testing.
It achieves high-precision, low-cost grid leakage rate testing under laboratory conditions, is applicable to various grid structures, covers different vehicle speed conditions, has good scalability and versatility, and supports testing of multiple product categories.
Smart Images
Figure CN224202703U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts testing and aerodynamic measurement technology, specifically a wind tunnel test bench. Background Technology
[0002] As modern automobiles continue to increase their requirements for energy conservation and emission reduction, overall vehicle performance improvement, and NVH control, the optimization of vehicle aerodynamic performance has become particularly important. As an important ventilation channel at the front of the vehicle, the structure, opening ratio, and arrangement of the front grille directly affect the airflow organization in the engine compartment, the heat exchange efficiency of the cooling system, and the drag coefficient of the entire vehicle.
[0003] Especially at high speeds, the leakage characteristics of the grille will determine the direction and flow distribution of airflow, thereby affecting the fuel economy and thermal management capabilities of the entire vehicle. Therefore, accurately determining the leakage rate of the grille at different vehicle speeds is of great significance for the aerodynamic performance analysis and component structure optimization of the entire vehicle.
[0004] Traditional understanding of grille performance largely relies on wind tunnel or road test data for the whole vehicle, making it difficult to conduct independent and quantitative research on this component. Wind tunnel experiments, due to the scarcity of equipment, high cost of resources, and long booking cycles, severely limit R&D efficiency.
[0005] Currently, the main testing methods for grid leakage rate in the industry include the following, each of which has certain technical or application limitations.
[0006] 1. Whole vehicle wind tunnel testing method
[0007] By placing the entire vehicle in a closed wind tunnel and measuring parameters such as the pressure distribution on the vehicle surface and the wind speed and flow rate in the engine compartment under constant wind speed conditions, leakage behavior at the grille can be indirectly analyzed. Although this method can provide global aerodynamic information, it is not suitable for frequent iterations and component-level testing due to its high testing cost (generally in the tens of thousands of yuan per hour) and limited test window. In addition, the long testing cycle and high assembly complexity often delay the development schedule.
[0008] 2. Road test data collection method
[0009] During actual vehicle operation, pressure sensors and wind speed probes are installed in front of and behind the grille to obtain the fluid characteristics during operation. The leakage rate is then calculated by combining environmental variables such as vehicle speed and wind direction. However, this method is limited by external climate conditions, has large measurement errors, poor repeatability, and cannot be used for standardized and quantitative testing. Furthermore, it is inconvenient to operate due to limitations such as road conditions, safety, and testing time.
[0010] 3. Simplified static sealing test method
[0011] Using a closed chamber or closed air box, static pressure or suction pressure is applied to the grille, and pressure changes are observed or leakage paths are observed through smoke to evaluate sealing performance. Although this method is simple to operate and low in cost, it is completely divorced from the simulation of real air flow field and vehicle speed. The test results cannot guide design improvements under actual working conditions and have poor technical reference value.
[0012] In summary, existing technologies still have the following shortcomings:
[0013] 1. Incomplete testing dimensions: Traditional devices cannot simultaneously collect pressure and flow data while simulating real wind speed, lacking a basis for quantitative calculation of leakage rate;
[0014] 2. High environmental dependence: Whether it is road testing or large wind tunnel testing, the test results are limited by the external environment or equipment conditions, and are not suitable for independent verification under laboratory conditions;
[0015] 3. The contradiction between cost and efficiency is prominent: wind tunnel or road testing of whole vehicles is costly, time-consuming, and has low iteration efficiency, making it difficult to meet the needs of rapid development and evaluation of a large number of prototypes;
[0016] 4. Lack of a general-purpose platform: Most existing testing methods are developed for specific purposes, and there is a lack of a compact, fully functional, and easy-to-operate small device that can meet the testing needs of different grid structures. Utility Model Content
[0017] In order to solve the above problems, the purpose of this utility model is to provide a wind tunnel test bench.
[0018] To solve the above technical problems, the present invention adopts the following technical solution: a wind tunnel test bench, including a wind duct, a conical cover fixedly provided at one end of the wind duct, a pipe head fixedly provided at the other end of the wind duct, an air supply component provided at one end of the conical cover, and a test component provided at the wind duct and the pipe head;
[0019] The air supply assembly includes a blower, and an air valve is installed at the air inlet of the blower. One end of the conical cover is fixedly installed at one end of the air valve.
[0020] The testing assembly includes a parallel air grille and a test slot. The parallel air grille is mounted on the inner wall of the duct, and the test slot is located in the middle of one end of the duct. The test slot is parallel to the parallel air grille, and several pressure sensors are mounted on the duct.
[0021] Preferably, the air valve is equipped with a flow sensor.
[0022] Preferably, an anemometer is installed at the upper end of the air duct.
[0023] Preferably, a plurality of the pressure sensors are evenly distributed on the pipe head.
[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0025] 1. In this utility model, the modular design makes operation convenient: the whole device consists of a fan module, a control module, a sensor module, a duct system and a test chamber. The modules are connected by standard interfaces, which facilitates quick assembly, disassembly and maintenance and is suitable for deployment in multiple scenarios.
[0026] 2. In this utility model, the simulation of real vehicle speed is accurate: the blower speed is precisely adjusted by the frequency converter, and the pressure difference conversion algorithm can simulate the wind field of the whole range of vehicle speed from low speed to high speed, making the test closer to the actual driving conditions and improving the reference value of data engineering.
[0027] 3. In this utility model, the high-precision leakage rate calculation method is as follows: the leakage rate is calculated by the ratio of theoretical flow rate to measured flow rate, and data redundancy verification is achieved through a precision flow meter and a multi-point pressure sensor to ensure the reliability and repeatability of the results;
[0028] 4. The present invention features a compact structure and a small footprint: The overall size of the device is small, making it suitable for use on laboratory benches. It can operate without relying on large testing sites, greatly reducing the testing threshold and cost.
[0029] 5. This utility model has good scalability and adaptability: the size of the device test chamber is adjustable, which is suitable for grid testing of various specifications and structures, supports quick switching of different samples, and meets the testing needs of multiple product categories.
[0030] 6. This utility model is applicable to a variety of application scenarios: in addition to grille leakage rate testing, it can also be extended to cooling module ventilation performance testing, airflow component efficiency evaluation, wind resistance component aerodynamic characteristic analysis, etc., and has strong versatility and commercial expansion potential. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is a schematic diagram of the structure of a wind tunnel platform according to the present invention.
[0033] Figure 2 This is a schematic diagram of the separation structure of the pipe head and the air duct of this utility model.
[0034] Figure 3 This is a schematic diagram of the connection between the test grid and the pipe head in an embodiment of this utility model.
[0035] In the diagram: 1. Air duct; 11. Conical shroud; 12. Pipe head; 2. Air supply assembly; 21. Blower; 22. Air valve; 23. Flow sensor; 3. Test assembly; 31. Parallel air grille; 32. Test slot; 33. Anemometer; 34. Pressure sensor; 10. Test grille. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0037] Example: Figure 1-3 As shown, this utility model provides a wind tunnel test bench, including a duct 1, a conical shroud 11 fixedly installed at one end of the duct 1, a pipe head 12 fixedly installed at the other end of the duct 1, an air supply assembly 2 installed at one end of the conical shroud 11, and a test assembly 3 installed on the duct 1 and the pipe head 12.
[0038] The air supply assembly 2 includes a blower 21, and a damper 22 is installed at the air inlet of the blower 21. One end of the conical cover 11 is fixedly installed at one end of the damper 22, and a flow sensor 23 is installed on the damper 22.
[0039] The test assembly 3 includes a parallel air grille 31 and a test slot 32. The parallel air grille 31 is mounted on the inner wall of the air duct 1. The test slot 32 is located in the middle of one end of the pipe head 12 and is parallel to the parallel air grille 31. The test grille 10 is mounted inside the test slot 32. An anemometer 33 is mounted on the upper end of the air duct 1. Four pressure sensors 34 are mounted on the pipe head 12 and are evenly distributed on the pipe head 12.
[0040] Working principle: When it is necessary to test the leakage of the test grille 10 of the car, the blower 21 is driven by its own frequency converter. The frequency of the blower 21 and the size of the air valve 22 are adjusted together to adjust the flow rate / wind speed inside the air duct 1.
[0041] The connection between the blower 21 and the air duct 1 is the air intake of the blower 21. It draws air from the atmosphere through the closed test grille 10. The parallel air grille 31 ensures that the airflow is uniform inside the air duct 1, which is used to simulate the working state of the test grille 10 under real vehicle conditions.
[0042] The flow sensor 23, the anemometer 33, and the four pressure sensors 34 are all collected by the board and used to test the pressure difference between the rear end of the grille 10 and the front end under different flow rates or wind speeds. The pressure difference can be calculated by formula to show that the test grille 10 is equivalent to the simulated vehicle speed condition.
[0043]
[0044] Where: P0 is the stagnation pressure;
[0045] P stat Due to environmental pressures;
[0046] P dyn This refers to dynamic pressure or differential pressure.
[0047] v represents the car's speed, measured in m / s;
[0048] ρ is the flow rate detected by the flow sensor 23 under the condition of recording the vehicle speed, because the grille has a certain leakage rate. The flow rate of the flow sensor 23 will be used as the actual test flow rate and compared with the calculated flow rate in the formula to obtain the leakage rate air density under different vehicle speed conditions.
[0049]
[0050] Where A is the theoretical cross-sectional area of the test grid 10 with open blades, determined based on CAD data;
[0051] v represents the car's speed, measured in m / s;
[0052] This device can simulate the leakage of the test grille 10 at different vehicle speeds from 50 to 210 km / h, and generate speed-leakage rate curves of the test grille 10 at different simulated vehicle speeds, covering common test conditions.
[0053] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.
[0054] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. A wind tunnel test bench, comprising a duct (1), characterized in that: A conical hood (11) is fixedly installed at one end of the air duct (1), and a pipe head (12) is fixedly installed at the other end of the air duct (1). An air supply assembly (2) is installed at one end of the conical hood (11), and a test assembly (3) is installed on the air duct (1) and the pipe head (12). The air supply assembly (2) includes a blower (21), and a damper (22) is installed at the air inlet of the blower (21). One end of the conical cover (11) is fixedly installed at one end of the damper (22). The test assembly (3) includes a parallel air grille (31) and a test slot (32). The parallel air grille (31) is mounted on the inner wall of the air duct (1). The test slot (32) is located in the middle of one end of the pipe head (12). The test slot (32) is parallel to the parallel air grille (31). Several pressure sensors (34) are mounted on the pipe head (12).
2. A wind tunnel test bench as described in claim 1, characterized in that, A flow sensor (23) is mounted on the air valve (22).
3. A wind tunnel test bench as described in claim 1, characterized in that, An anemometer (33) is installed at the upper end of the air duct (1).
4. A wind tunnel test bench as described in claim 1, characterized in that, Several pressure sensors (34) are evenly distributed on the tube head (12).