Piston stopping device for gun wind tunnel

Abstract

The invention relates to a piston stopping device for a gun wind tunnel, and the device comprises a top rubber, a base body, a guide column connecting part, a guide column, a pedestal, a bottom cover,a bottom rubber, a spring, and a spring guide rod. The top rubber and the bottom rubber are made of fluororubber, and are enabled to be attached to the base body and the bottom cover in a mode of injection molding pressing. The base body employs a structure shaped like the Chinese character Tu, and is provided with a plurality of through holes, thereby increasing the adhesive force of the top rubber. The overall external diameter of the device is slightly greater than the internal diameter of a laser tube, and the internal tube of the device is greater than the diameter of the throat of a spraying pipe. Before testing, the device is placed at the tail end of the laser tube, and an air flow passes through the device along the internal diameter in a testing process. The device achieves thesoft landing of the piston at the tail end of the laser tube under the condition that a wind tunnel flow field is not affected through the simple and reasonable mechanical structure, solves a problemthat the piston is liable to be damaged in the operation process of the gun wind tunnel, and saves the operation cost.

Description

technical field [0001] The invention relates to a piston stop device used in a gun wind tunnel, belonging to the field of hypersonic shock wave wind tunnel engineering. Background technique [0002] The gun wind tunnel is a shock wave wind tunnel driven by a light piston. The piston driven by high pressure compresses the driven gas to generate a shock wave to increase the total temperature of the wind tunnel. The structure of the gun wind tunnel is very simple, and the cost is relatively low. With the development of modern testing technology, it can undertake most of the hypersonic aerodynamic and aerothermal measurement tests, and it plays an increasingly important role in the development of the new model's aerodynamic shape. role. The piston of the gun wind tunnel is very light, and the material is generally made of aluminum alloy. The "Σ" type thin-walled structure has a wall thickness of no more than 10mm. During the experiment, driven by the high-pressure gas behind th...

AI Technical Summary

Problems solved by technology

However, the piston is limited by weight, especially when the diameter of the shock tube is large, the required structural strength of the piston cannot withstand the impact force during the landing process, resulting in a short life of the piston, and it is easy to deform, crack or even break during the landing process.

Images