某型号双螺杆压缩机流场分析及试验验证

Flow Field Analysis and Experimental Verification for a Certain Type of Twin Screw Compressor

针对双螺杆压缩机内部流体域结构复杂且呈周期性变化的特点,提出一种针对5~6齿双螺杆压缩机流场仿真研究的方法。该方法利用Scorg和Pumplinx软件联合对双螺杆压缩机流场进行仿真分析,避免了出现动网格负体积现象,解决了通过编写复杂的UDF函数定义阴、阳旋转方式的难题。仿真分析结果表明:作用于转子上的流体压力从进气口到出气口沿着轴线方向呈逐渐递增趋势,压力较高的压缩、排气域与压力较低的吸气域以接触线为界限两侧分布,压力呈波动性变化;温度变化呈非稳态特性,越靠近排气口变化越剧烈。通过试验的方式对双螺杆压缩机出口温度、压力的变化进行测试,试验结果表明,仿真数据与试验数据吻合度较好。因此,该仿真方法为螺杆压缩机的设计与深入研究提供了参考。

Aiming at the complex and cyclical variation of the internal fluid domain structure of the twin-screw compressor,a numerical simulation method for the flow field simulation of the 5~6 tooth twin-screw compressor was proposed.In the method,Scorg software and Pumplinx software were used to jointly analyze the flow field of twin-screw compressor,the negative volume phenomenon of moving mesh was avoided,and the problem of defining the negative and positive rotation modes by writing complex UDF functions was solved.The simulation results show that the fluid pressure acting on the rotor gradually increases from the inlet to the outlet in the axial direction,the compression and exhaust areas with higher pressure and the lower pressure suction area are bounded by the contact line,the pressure changes fluctuationally;the temperature change is non-steady-state,and the closer it is to the exhaust port,the more severe the change.The temperature and pressure of the twin-screw compressor outlet were tested.The test results show that the simulated data agree well with the experimental data.The research provides reference for the design and in-depth study of screw compressors.