双螺杆膨胀机的有限元仿真与试验研究

Finite Element Simulation and Experimental Study of Twin Screw Expander

构建了双螺杆膨胀机的数学模型,借助计算流体力学中的网格界面法实现双螺杆膨胀机吸气、膨胀以及排气的周期性变化过程仿真,借助ANSYS中的CFX模块对膨胀机进行流场分析,得到压力云图以及速度云图。为了验证构建模型的合理性以及仿真结果的准确性,通过搭建膨胀机的内部压力测试系统,完成对该模型的p—V变化规律的试验研究。结果表明:仿真数据与试验数据基本吻合,为双螺杆膨胀机的性能以及结构优化提供了参考。

This study constructs a mathematical model of a twin-screw expander. The model realizes the cyclical variation of the suction , expansion and exhaust of the twin-screw expander by means of the grid interface method in computational fluid dynamics.The flow field analysis of the expander was carried out by the CFX module in ANSYS, and the pressure cloud map and the velocity cloud map were obtained. In order to verify the rationality of the model and the accuracy of the simulation results, an internal pressure test system of the expander was built to complete the experimental study on the p-V variation of the model. The results show that the simulation data are basically consistent with the experimental data, which provides a reference for the performance and structure optimization of twin screw expander.