重活塞压缩器性能参数的数值解法

Numerical Method of Calculating Performance Parameters of a Heavy Piston Compressor

给出了一种精确计算重活塞压缩器性能参数的新方法，利用该方法可得到不同运行条件下自由重活塞运动的全过程和被压缩气体状态参数变化的全过程．该方法是对自由活塞激波风洞运行理论的发展，形成的计算软件可直接应用于自由活塞激波风洞的设计和状态调试．算例表明，活塞运动速度和被压缩气体特性主要依赖于活塞的单位面积质量。和活塞两侧的初始压力ｐ０和ｐ１；活塞与管壁之间的滑动摩擦力是次要因素，在滑动摩擦系数ｆ＝０．４～１．２范围内，摩擦力对活塞运动速度的影响很小．

A new method of calculating exactly Performance parameters of a heavy piston compressor has been investigated in this paper. From the theory of unsteady flow,the processes of the heavy piston motion and the variation of the compressed gas property have been obtained under various circumstances. The numerical method is a development from the operating principle of a heavy piston compressor and the utility program is very important to the design and calibration of a free-piston shock tunnel.Examples show that the piston velocity and compressed-gas property depend strongly on the unit area mass of the piston,σ,and the initial pressure on both sides of the piston ,p0 and p1,but the effect of the sliding friction between the piston and compress tube on the piston motion is very small in the range of sliding friction coefficients from 0.4 to 1.2.