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A method for measuring the thickness of the boundary layer

A technology of thickness measurement and boundary layer, which is applied in the field of aerodynamics in the aerospace industry, can solve the problems of limited number of measurement points and large measurement errors, and achieve the effects of improving measurement accuracy, reducing measurement errors, and small flow field interference

Active Publication Date: 2022-05-31
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the number of measuring points in this measurement method is very limited, and the distance between the total pressure detection tube and the static pressure probe is relatively short, there is a certain degree of flow interference, and the measurement error is relatively large

Method used

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  • A method for measuring the thickness of the boundary layer
  • A method for measuring the thickness of the boundary layer
  • A method for measuring the thickness of the boundary layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A pitot tube bracket is processed and installed on the measurement position of the sidewall boundary layer thickness of the wind tunnel test section. stand can

[0048] Step 2) paste or spray a plurality of special marking points for binocular vision ranging along the flow direction on the surface of the pitot tube.

[0049] On the surface of the pitot tube, 3-5 special marking points for binocular vision ranging are arranged along the flow direction. Markers can be picked

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Abstract

The invention discloses a method for measuring the thickness of a boundary layer, which is realized based on a pitot tube moving measurement device and a double-sided visual distance measuring system. Including the bracket and the pitot tube fixed on the bracket; mark several marking points on the surface of the pitot tube along the direction of the flow; move the pitot tube displacement measuring device; after each movement, measure the total pressure value and static pressure value, and measure each mark The position of the point; according to the position of each mark point before and after the movement, the deformation of the Pitot tube under the action of aerodynamic force is obtained, and the total pressure value and the static pressure value are corrected to obtain the corrected total pressure value and the corrected static pressure value ; and calculate the dimensionless velocity of this movement; according to the dimensionless velocity of each movement, the dimensionless velocity distribution in the boundary layer is obtained; from it, the corresponding movement distance when the dimensionless velocity is equal to the preset value is selected, and then the measured Boundary layer thickness of the segment.

Description

A kind of measurement method of boundary layer thickness technical field The present invention relates to aerospace industry aerodynamics technical field, relate in particular to a kind of boundary layer thickness measurement method [0001] Law. Background technique The boundary layer is a thin flowing layer whose viscous force close to the object surface cannot be ignored in the fluid flow around, also known as the flow boundary layer, boundary layer. This concept was first proposed in 1904 by Prandtl, the founder of modern fluid mechanics. In the boundary layer, close to The fluid on the object surface is completely adhered to the object surface, and the flow velocity is zero; from the object surface outward in the normal direction, the fluid velocity rapidly increases to the local Free stream speed. The development, transition, and separation of the boundary layer affect the aerodynamic properties of advanced aircraft and the flow field in large-scale production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02G01B11/26
CPCG01B11/02G01B11/26Y02T90/00
Inventor 吴继飞李国帅徐来武罗新福李阳
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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