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自由活塞激波风洞是一种高焓值的高超声速地面试验设备,其运行时间十分短暂。提高自由活塞激波风洞有效试验时间的一个可行途径是延长定压驱动时间。以此为目的,本文探索了活塞压缩器中活塞速度对定压驱动时间的影响。研究结果表明,在不同的初始参数下,定压驱动时间关于活塞速度存在极大值,这些极大值形成了一条脊线(局部极值曲线)。随后,通过数值计算的结果归纳出脊线的若干性质。这些结果表明,在活塞压缩器的理论设计中,设计参数应选择在靠近这条脊线的区域,并且该处的定压驱动时间关于参数的梯度应该相对较小。
Free piston shock wind tunnel is a high enthalpy hypersonic ground test equipment, its run time is very short. One possible way to improve the effective test time of a free-piston shock wind tunnel is to extend the constant pressure driving time. For this purpose, this paper explores the piston compressor piston speed on the constant pressure drive time. The results show that under different initial parameters, there is a maximum value of the fixed pressure driving time with respect to the piston speed, and these maximum values form a ridge line (local extreme curve). Afterwards, several results of the numerical calculation are summarized. These results show that in the theoretical design of the piston compressor, the design parameters should be chosen close to this ridgeline, and the constant pressure driving time at this point should be relatively small with respect to the gradient of the parameters.