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Method for confirming wind tunnel shrink section curve

A method for determining the contraction section, which is applied in the field of fluid power, can solve the problems of steep contraction of the contraction section curve, unequal, and the radius of curvature that cannot be smoothly connected with the stable section at the entrance, so as to achieve complete curvature continuity, perfect connection, and uniform distribution of airflow Effect

Inactive Publication Date: 2014-01-08
BEIJING AEROSPACE YISEN WIND TUNNEL ENG TECH
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Problems solved by technology

[0004] The technology of the present invention solves the problem: overcomes the deficiencies of the prior art, and provides a method for determining the contraction curve of the wind tunnel, which overcomes the contraction curve of the prior art at the front or the rear that shrinks very steeply, and the entrance cannot be smooth with the stable segment The radius of curvature of the connection and the outlet is not equal to the radius of curvature of the supersonic expansion curve, and the contraction curve is obtained by setting the cylindrical curve, the first quartic curve, the conic curve and the second quartic curve

Method used

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  • Method for confirming wind tunnel shrink section curve
  • Method for confirming wind tunnel shrink section curve
  • Method for confirming wind tunnel shrink section curve

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Embodiment Construction

[0028] The method of the invention obtains the contraction segment curve by setting the cylinder segment curve, the first quartic curve, the conic segment curve and the second quartic curve.

[0029] A method for determining the curve of the contraction section of a wind tunnel, such as image 3 shown, including the following steps:

[0030] (1) Divide the shape curve of the shrinkage section of the wind tunnel into four parts, namely the cylindrical section curve, the first quartic curve, the conical section curve and the second quartic curve, as shown in figure 1 As shown, 1 in the figure represents the cylinder segment, 2 represents the first quartic curve segment, 3 represents the conical segment, 4 represents the second quartic curve segment, and 5 represents the exit of the contraction segment.

[0031] (2) if figure 2 As shown, establish a coordinate system, take the line connecting the entrance and exit center points of the contraction section as the x-axis, the dir...

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Abstract

The invention provides a method for confirming a wind tunnel shrink section curve. According to the method, once an inlet size, an outlet size, a shrink section length and a curvature radius of a shrink section outlet are given, a cylindrical curve, a first biquadratic curve, a conic curve and a second biquadratic curve are sequentially arranged from an inlet of the shrink section, and the shrink section curve is obtained. The shrink section curve designed in the method is suitable for a subsonic speed wind tunnel and a supersonic speed wind tunnel, the whole curve curvature is completely continuous, the curvature of the inlet and the curvature of an outlet are the same as the curvature of a front element and the curvature of a rear element, and perfect connection is achieved. The front of the curve cannot shrink abruptly, an overshoot phenomenon cannot occur to the outlet, and defects of an existing shrink curve are overcome. Air flows of the outlet are evenly distributed.

Description

technical field [0001] The invention relates to a method for determining the curve of a contraction section of a wind tunnel, which belongs to the technical field of fluid power. Background technique [0002] The function of the shrinking section of the wind tunnel is to uniformly accelerate the airflow, accelerate the airflow in the stable section to the flow velocity required in the subsonic wind tunnel test section, or accelerate the airflow to the speed of sound in the super / hypersonic wind tunnel. In the 1940s, people studied the design of the curve of the contraction section of the wind tunnel, and obtained a variety of algorithms for the curve of the contraction section. The common point of these algorithms is that given an axial velocity distribution, the entire flow field is calculated according to the basic equation of ideal flow, and then a streamline that meets the shrinkage ratio requirement is selected in this flow field as the shrinkage section. Even some met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01M9/02
Inventor 黄炳修王铁进孙勇堂崔春
Owner BEIJING AEROSPACE YISEN WIND TUNNEL ENG TECH
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