天然气低温超音速流动过程的热力学模拟与分析

摘要

Thermo - dynamic simulation of supersonic flow of nature gas was conducted based on the SRK real gas equation of state. The comparison indicates that a obvious difference of the temperature decreasing process and section area between the re al and ideal gas existed. Furthermore, the liquefaction point was dependant on the inlet condition while the critical point kept in variable. The variation of Ma under different inlet condition was also very similar.%基于SRK实际气体状态方程,对天然气在高压低温条件下经过超音速分离管的高速膨胀过程进行了热力学的计算和模拟.通过将实际气体的计算结果与理想气体计算结果进行比较,发现两者降温及截面积有很大区别,但截面积变化规律相似.而且不同入口条件下达到临界点所需压比一致,但液化点差别很大.在两相区截面增速变缓,但马赫数相差不大.