A low-pressure venturi group plane distribution structure and installation method

Abstract

The invention discloses a plane distribution structure and installation method of a low-pressure venturi tube group, which comprises a first low-pressure venturi tube, a second low-pressure venturi tube and a third equivalent low-pressure venturi tube with equal areas; the first low-pressure venturi tube Venturi tube, the outer circle of the second low-pressure venturi tube are tangent to each other, and the equivalent outer circle of the third equivalent low-pressure venturi tube is tangent to each other, and the centers of the three circles form an equilateral triangle; the third The equivalent low-pressure venturi tube includes several low-pressure venturi tubes with different throat areas. In the third equivalent low-pressure venturi tube, the fourth low-pressure venturi tube with the largest throat area is the center, and the other low-pressure venturi tubes Distributed outside the circumference of the fourth low-pressure venturi tube; the flat structure of the low-pressure venturi tube group invented by this patent can ensure that the flow inside the box is symmetrical and uniform under different working conditions, and improve the flow rate measurement of the low-pressure venturi tube. Accuracy, does not affect the measurement of jet thrust, and can ensure the stability of the box flow.

Description

technical field [0001] The invention relates to the field of aerodynamic wind tunnel tests, in particular to a plane distribution structure and installation method of low-pressure venturi tube groups. Background technique [0002] In some special experimental aerodynamic fields, it is required to calibrate the flow and thrust of a specific experimental model in a calibration box to obtain the flow coefficient and thrust coefficient. In order to accurately measure the flow rate of the experimental model, a group of low-pressure venturi groups with different throat diameters are installed in the calibration box, that is, a low-pressure venturi group installation plane is set at the outlet of the calibration box, and the low-pressure venturi group is installed on the installation plane. Low pressure venturi tubes with different throat diameters, see figure 1 . During calibration, the inlet of the low-pressure venturi is connected to the calibration box, and the outlet is conn...

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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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