Optimized Design Of Dual-piston Opposing Compression Wind Tunnel

The double pistons opposed compression tunnel is a hypersonic flow ground simulation test equipment,which is mainly used to carry out research work on fuel combustion in hypersonic flow.This article mainly performs the following work around the double pistons opposed compression tunnel:(1)The effective test time of most hypersonic airflow test equipment is very short at home and abroad,usually on the order of milliseconds.In order to prolong the effective experiment time,this article proposes an optimization scheme of the test equipment for the double pistons opposed compression tunnel.(2)This paper briefly introduces the optimization scheme of the double pistons opposed compression tunnel,simplifies the analysis of the test gas state parameter changes during the operation of the test equipment,and briefly analyzes the optimization design of each subsystem of the test equipment.It is theoretically proved that the optimized test equipment can prolong the effective test time.(3)The optimized content of the double pistons opposed compression tunnel includes a piston buffer device,a piston restraint system and a constant pressure system.The dissertation designs the subsystems in detail,and completes the constructions and debugging of the test equipment.(4)The thesis conducts test verification and analysis of the optimization scheme of the double pistons opposed compression tunnel.The double pistons opposed compression tunnel test results shows that the optimization in this paper is practical and effective.The total field pressure of the gas in the chamber and the flow field display at the nozzle exit of the laser shadowgraph proved that the effective time of the optimized double pistons opposed compression tunnel was at least 35 ms,which is more than double the test time compared to before.