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单螺杆膨胀机基元容积膨胀过程两相流模拟研究
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Abstract:
本文通过采用CFD数值模拟分析法研究单螺杆膨胀机基元容积膨胀过程油气两相流的非稳态流动特性。考虑到单螺杆空间三维曲面结构的复杂性以及要实现单螺杆膨胀机基元容积膨胀过程的实时变化，利用STAR-CCM+软件对三维计算模型进行网格划分并采用变形网格技术实现动态膨胀过程的模拟仿真。模拟结果得到单螺杆膨胀机膨胀过程工质压力和温度变化规律，获得基元容积内流场的压力、温度和油气两相分布云图，并深入分析润滑油对工质状态的作用规律。
CFD simulation method has been used to investigate internal unsteady oil-gas two-phase flow characteristics of basic element volume of single screw expander during the expansion process. Due to the difficulty of three-dimension spacial curved surface of single screw structure and the real-time change of basic element volume of single screw expander during expansion process, the three-dimension computation model is meshed by using the STAR-CCM+ software and its morphing technology has been applied to simulate the dynamic two-phase flow of expansion process. The simulation results show that variation in the pressure and temperature of working fluid during the expander expansion process has been given, the cloudy chart of pressure, temperature and oil-gas two-phase distribution in the basic element volume has been obtained, and the effect of lubrication oil on the state of working fluid has been analyzed.
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