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A Test Method and Its Application for Obtaining Darcy Coefficient of Hole Wall

A test method and coefficient technology, applied in the field of testing to obtain the Darcy coefficient of the hole wall, which can solve the problems of low accuracy of the results and the inability to evaluate the influence of the change of the boundary layer of the hole wall.

Active Publication Date: 2020-11-20
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

[0008] The purpose of the present invention is to obtain the Darcy coefficient at home and abroad mainly through the comparative measurement method of the test model, but this method can only obtain the characteristic parameters of a specific model and a single wall plate form, and cannot evaluate the hole caused by the blockage change of the model. Influenced by the change of the wall surface layer, and the measurement results include deviations caused by different trains and models, and the accuracy of the results is low. Provide a test method for obtaining the Darcy coefficient of the hole wall and its application

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  • A Test Method and Its Application for Obtaining Darcy Coefficient of Hole Wall

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[0040] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0041] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0042] In order to better understand the improvement made by the present invention compared to the prior art, before describing the specific implementation of the present invention in detail, the prior art mentioned in the background section will be described with reference to the accompanying drawings.

[0043] figure 2 A schematic diagram showing the measurement method of the flow characteristic parameters of the French S2 wind tunnel wall ( figure 2, from left to right: to be determined, solid ...

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Abstract

The invention discloses a test method for obtaining the Darcy coefficient of a hole wall, and application thereof, and aims to solve the problems as follows: the Darcy coefficient of the hole wall isobtained mainly through a comparative measurement method of a test model at home and abroad currently; but, only the Darcy coefficient in the forms of a specific model and a single wall plate can be obtained through the method; hole wall boundary layer change influence due to model blockage change cannot be evaluated; furthermore, a measurement result includes deviation due to different trains andmodels; and the result accuracy is relatively low. The invention provides the test method for conventional transonic wind tunnel hole wall Darcy coefficient measurement, and application thereof in asubsonic and transonic open-hole wind tunnel. Darcy coefficients different in Mach number and model attack angle state can be obtained in the invention; furthermore, influence of hole wall boundary layer characteristics, test running Reynolds numbers and the like can be included in the relation of the Darcy coefficient and a model lift coefficient; the method is suitable for a subsonic and transonic running range, the Mach number of which is less than 0.95; and a limiting condition is that large-area flow separation does not occur on a model lift surface.

Description

technical field [0001] The invention relates to the field of wind tunnels, in particular to the field of experimental fluid mechanics, in particular to a test method for obtaining the Darcy coefficient of a hole wall and its application. More specifically, the present invention provides a test measurement and data processing method for obtaining the Darcy coefficient of the hole wall of a conventional transonic wind tunnel test section. Background technique [0002] The wind tunnel is the most important ground simulation equipment that provides the data of the aerodynamic characteristics of the aircraft, and the accurate and reliable wind tunnel test data is the basis for the analysis and improvement of the aerodynamic performance of the aircraft. However, the current wind tunnel test cannot fully simulate the flight conditions in the atmosphere; among them, the interference of the tunnel wall is one of the important influencing factors. Therefore, if the wind tunnel test d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/06G01M9/02
Inventor 邓吉龙刘光远王瑞波杨可郑晓东张林魏志林学东陈学孔杨洋贾智亮杨昕鹏
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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