A gas rectification structure inside the box

Abstract

The invention discloses a gas rectification structure inside a box, which includes a box, and the box includes a box inlet, a straight section of the box, and an outlet of the box, and is characterized in that: the straight section of the box is provided with Several layers of damping nets, all damping nets are perpendicular to the axis of the box body, and distributed between the box body inlet and box body outlet, the damping nets are divided into two parts in turn, and each layer of damping nets near the box body entrance part is provided with A hole other than the open mesh, each layer of the damping net near the box outlet has no holes other than the open mesh, and the hole of each layer of the damping net has an expansion angle relative to the box inlet caliber, from the box entrance At the beginning, the last layer has a damping net with holes, and honeycombs are arranged in the holes; the invention directs the jet flow, greatly reduces the lateral flow of the jet flow, controls the generation of large-scale vortices inside the box, and makes the airflow direction more accurate. Consistent, more even.

Description

technical field [0001] The invention relates to the field of aerodynamic wind tunnel tests, in particular to a gas rectifying structure inside a box body. 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 box to obtain the flow coefficient and thrust coefficient. During calibration, the jet flow generated by the experimental model will flow inside the box. Normally, the jet flow generated by the experimental model will flow from the box inlet to the box outlet. In the flow process, on the one hand, the jet flow itself under different working conditions may have complex unsteady flows such as Karman vortex street, shock wave, expansion wave, etc., which makes the jet flow have obvious unstable characteristics, which in turn affects the inside of the box. flow stability; on the other hand, the jet flow will form a shear layer inside the box, and the shear layer i...

AI Technical Summary

Problems solved by technology

There are obvious differences between the air flow inside the box and the flow of conventional pipes or wind tunnels. There is no standard specification to follow, and it is difficult to form a set of effective rectification methods for different influencing factors.

[0005] Second, the rectification device must consider the calibration test results, and cannot affect the accurate measurement of the jet flow and thrust, otherwise it will lead to wrong calibration results

In the case of low-speed flow, the flow has the characteristic of propagating forward. If the rectifier is arranged at the rear of the jet, if the design is unreasonable, it will cause obvious deviations in the thrust of the jet. If the flow is uneven, it will also affect the measurement of the suction flow, resulting in There are errors in the flow rate, which will affect the calibration results

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