材料性能对双螺杆压缩机转子结构特性的影响

Influence of Material Properties on Rotor Structure of Twin Screw Compressor

为研究材料性能对双螺杆压缩机转子结构特性的影响,以LGY03型线为啮合型线的转子为研究对象,基于Realizable k-ε湍流模型,采用CFD/CSD(Computational Fluid Dynamics/Computational Structural Dynamics)耦合求解方法,对压缩机流场达到热平衡时的转子结构特性进行了研究。通过数值模拟分析,得到了40Cr、QT900-2、0Cr18Ni9等转子材料在排气压力为0.6 MPa下的热变形和热应力。研究结果表明转子的热应力、热变形主要与材料的热膨胀系数和弹性模量相关,泊松比对转子变形的影响较小,最后数值拟合得到了阴阳转子最大应变与热膨胀系数及弹性模量的公式,可为转子结构设计提供一定的理论依据。

Aiming at studing the influence of material performance on rotor performance,the rotor with LGY03 profile as meshing profile was taken as the research object.Based on the realizable k-εturbulence model,the CFD/CSD coupling solution method was used to study the rotor structure characteristics when the compressor flow field reached thermal balance.The thermal deformation and thermal stress of 40Cr,QT900-2 and 0Cr18Ni9 rotor materials under the exhaust pressure of 0.6 MPa were obtained by numerical simulation.The results show that the thermal stress and deformation of the rotor are mainly related to the thermal expansion coefficient and elastic modulus of the material,and Poisson's ratio has little effect on the deformation of the rotor.Finally,the formulas of the maximum strain,thermal expansion coefficient and elastic modulus of the yin-yang rotor are obtained by numerical fitting,which can provide a theoretical basis for the rotor structure design.