模型是建立在压力能量消耗率最小的原理上的，其基本原理是：在气-液两相流的流型中，环状流具有相当稳定的流动状态。
Its basic principle is that there is a quite steady flow state of annular flow in the flow pattern of gas-liquid two-phase flow.
动力元件：把原动机输出的机械能转变为液体压力能的能量转换装置。
Power element: an energy conversion device for converting mechanical energy output from a prime mover into a liquid pressure energy.
有效压力系统是宏观动力能共同作用于煤储层而形成的压力体系，是联系煤储层地层能量与煤层气成藏的桥梁和纽带。
Effectual stress system, as the bridge of relating stratum energy and CBM reservoir formation, is formed by macroscopical dynamical energies which act on coal-bed.
有效压力系统是宏观动力能共同作用于煤储层而形成的压力体系，是联系煤储层地层能量与煤层气成藏的桥梁和纽带。
Effectual stress system, as the bridge of relating stratum energy and CBM reservoir formation, is formed by macroscopical dynamical energies which act on coal-bed.
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