基于均相流模型,利用质量守恒、动量守恒和能量守恒等基本定律以及传热学中一些基本概念,导出了计算两相临界流的差分方程组。该方程组考虑了管路截面变化、有热交换及有局部节流装置等因素对临界流量的影响。该方法适合于管路出口质量含汽率小于0.1或者大于0.75的管路系统。 Based on the homogeneous flow model and using some basic concepts of conservation of mass, conservation of momentum and conservation of energy, and some basic concepts in heat transfer, the differential equations for the calculation of two-phase critical flow are derived. The equations take into account the changes of the pipeline section, with heat exchange and partial throttling devices and other factors on the critical flow. The method is suitable for the pipeline outlet quality pipeline system containing less than 0.1 or more than 0.75.