Low-pressure venturi tube group plane distribution structure and mounting method

Abstract

The invention discloses a low-pressure venturi tube group plane distribution structure and a mounting method. The low-pressure venturi tube group plane distribution structure comprises a first low-pressure venturi tube, a second low-pressure venturi tube and a third equivalent low-pressure venturi tube which are equal in area, the excircle of the first low-pressure venturi tube and the excircle of the second low-pressure venturi tube are tangent to each other and are respectively tangent to the equivalent excircle of the third equivalent low-pressure venturi tube, and the centers of the three circles form an equilateral triangle; the third equivalent low-pressure venturi tube comprises a plurality of low-pressure venturi tubes with unequal throat areas, a fourth low-pressure venturi tube with the largest throat area in the third equivalent low-pressure venturi tubes is taken as the center, and other low-pressure venturi tubes are distributed outside the circumference of the fourth low-pressure venturi tube; according to the low-pressure venturi tube group plane structure, under different working conditions, it can be guaranteed that flow in the box body is symmetrical and uniform, the flow measurement accuracy of the low-pressure venturi tubes is improved, measurement of jet flow thrust is not affected, and the flowing stability of the box body can be guaranteed.

Description

Technical field [0001] The present invention relates to the field of aerodynamic wind tunnels, and is specifically involved in a flat distribution structure and mounting method of low-pressure Wentian tube group. Background technique [0002] In some special experimental aerodynamics, traffic and thrust coefficients and thrust coefficients are obtained in a calibration box in a calibration box. In order to accurately measure the flow of the experimental model, install a set of low-pressure diameters in the calibration box, that is, set a low-pressure Wentian tube assembly installation plane in the calibration box outlet, installed on the installation plane of the low-pressure Wentian tube group. Low-pressure Wents, which different throat diameters, see figure 1 . When the calibration, the low-pressure Wenthopper entrance is connected to the calibration box. The exit is connected to the suction pipe. Under the suction of the suction pipe, the low-pressure Wents tube works in a cri...

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Problems solved by technology

[0003] However, the accurate measurement of the flow rate of the low-pressure venturi tube is closely related to the plane distribution of the low-pressure venturi tube group. The unreasonable distribution of the low-pressure venturi group will lead to asymmetrical and uneven flow inside the box. The uneven distribution of inlet pressure makes the flow measurement of the low-pressure venturi tube inaccurate. On the other hand, serious asymmetry and unevenness appear inside the box, which will affect the calibration of the jet thrust, and even cause flow irregularities in the box. Stability phenomenon, affecting experimental safety

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