Mira separation structure model for air automotive aerodynamics research

A technology of structural model and experimental research, applied in the field of automotive aerodynamics, can solve the problems of increased labor intensity and time consumption, increased test error, interference with measurement data, etc., to achieve the effect of light structure, reduced test error, and guaranteed volume

Pending Publication Date: 2019-08-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, in the wind tunnel test, because the model is solid as a whole, the pressure valve when measuring the surface pressure can only be installed outside the car body model through the lead wire, which will cause disturbance of the object and interfere with the measurement data; the solid model has been moved many times. Manual adjustment is also time-consuming and laborious; when the model is installed, it is not considered how to eliminate the problem of moving up and down after the model is connected to the balance measurement system
The existence of these problems increases the experimental error, labor intensity and time consumption

Method used

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  • Mira separation structure model for air automotive aerodynamics research
  • Mira separation structure model for air automotive aerodynamics research
  • Mira separation structure model for air automotive aerodynamics research

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A Mira split structure model for automobile wind tunnel experimental research, including main body 1, tail cover 2, middle plate 3, and bottom plate 4; figure 2 As shown, the main body is a car body model frame, and its front half is an engine compartment and a driver's compartment, and its interior is a cavity; 4 Splicing with the main body 1 to close the cavities, the outer surfaces of the joints are all flush, and the joints between the plates have no grooves, such as image 3 Shown; The lower part of the main body of the vehicle body is symmetrically arranged with four semicircular wheels 6, the tread of the wheels 6 is provided with a vertical hole 9, and the wheel disc of the wheels 6 is provided with a threaded hole 10; the threaded hole 10 and the vertical hole 9 crosses, such as figure 2 , which is convenient for later model fixing.

[0030] Such as figure 1 , 2 , 3, 4; the tail cover 2 is placed on the middle plate 3; the tail cover 2 is in the shape of ...

Embodiment 2

[0036]The difference between this embodiment and Embodiment 1 is that, based on the mortise and tenon connection between the tail cap and the main body, and the tail cap is a shell-like structure, which is light and easy to disassemble, the Mira split structure model provided by the present invention has multiple replaceable For the installed tail caps 2 of different shapes, each tail cap can be evenly spliced ​​on the main body and fixed. During the test, the tail cover 2 can be easily replaced to realize the replacement of the back. Compared with the traditional solid model, this model is convenient for comparative research and saves materials. It only needs one main body to cooperate with different tail covers to transform into multiple models. Model.

[0037] Such as Figure 5 , 6 As shown, tail covers 21, 22, and 23 with different inclination angles are respectively assembled on the main body 1, so that the vehicle type can be set as a sedan, a fastback hatchback, and a...

Embodiment 3

[0039] In this embodiment, a method for installing and fixing the models described in Embodiment 1 and Embodiment 2 is provided.

[0040] When testing in a wind tunnel, if the model is not installed firmly, it is very likely to cause inaccurate test results or even accidents. Therefore, the car model must be firmly installed on the balance measurement system. In this embodiment, four neatly arranged pillars (not shown in the figure) are arranged on the supporting surface of the strain balance, and at the same time, as figure 2 The vertical holes 9 are respectively provided on the treads of the four wheels 6 of the model shown, and the vertical holes can be connected with the pillars on the balance in a manner of hole shaft cooperation, that is, the pillars on the support surface of the balance are respectively inserted into the corresponding support pillars. The initial fixation of the model can be completed in the hole, but for the convenience of installation, the diameter o...

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PUM

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Abstract

The invention proposes a Mira separation structure model for air automotive aerodynamics research. The Mira separation structure model comprises a main body, a tail cover, an intermediate plate and abottom plate, wherein the main body is an automotive body model framework, a front half part of the main body is an engine cabin and driver cabin, the engine cabin and the driver cabin both are cavities, a passenger cabin and a rear compartment position of a rear half part of the main body are cavities, the intermediate plate, the bottom plate and the main body are spliced to seal the cavity, a mortise is arranged on a back surface of a front row part of the passenger cabin, the tail cover is arranged on the intermediate plate, a tenon is arranged at a front end of the tail cover and is inserted into the mortise on the back surface of the front row part of the passenger cabin, an outer surface is flush after an edge of a lower end of the tail cover is spliced with a rear half part framework of the main body, and a plurality of pressure measurement holes are formed in each surface of the automotive body. By the model, the model weight is greatly reduced, and carrying and adjustment arefacilitated; and meanwhile, a measurement device is also convenient to install in the model, turbulent flow caused by an external measurement device to intervene experiment data can be prevented, thetail cover can be replaced, and comparison research is performed.

Description

technical field [0001] The invention relates to the technical field of automobile aerodynamics, and more particularly relates to a Mira split structure model used for automobile wind tunnel experimental research. Background technique [0002] Automobile aerodynamics is an important branch of aerodynamics. With the development of China's automobile industry, the role of automobile aerodynamics has become increasingly prominent. [0003] Collecting data such as aerodynamic force, surface pressure, and flow field information through wind tunnel experiments is the basic data for current automotive aerodynamics research. Due to the many working conditions of the data collected in the experiment, it is necessary to adjust the attitude of the model many times. [0004] The Mira model is a body-like model used in the research of automobile aerodynamics in the world. At present, when processing this model, it is generally an integral solid model. Obviously, in the wind tunnel test, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/08
CPCG01M9/08
Inventor 张勇谷正气龚金科刘水长郑乐典韩征彤
Owner HUNAN UNIV
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