多工况下离心压缩机叶片承载的流固耦合效应分析

Analysis of the Blade Loading of Centrifugal Compressor with the Effect of Fluid-solid Interaction Under Variable Conditions

针对国内某大型离心压缩机叶轮叶片利用流固耦合技术,通过求解流体和固体的耦合方程,对冬季和设计工况下的叶轮叶片的应力应变分别进行了计算:分析。理论分析表明,叶轮叶片的应力主要由离心力引起的拉应力和气动载荷引起的叶片弯应力构成。数值计算表明:对所研究的离心叶轮而言,离心力产生的拉应力是构成叶片应力的和要因素,而气动载荷引起的叶片应力相对较小;但单独进行力学分析其危险工作面的位置会发生变化,计算结果显示应力应变异常区域与实际叶片发生断裂的部位相一致。本文研究结果为实际运行发生事故的原因分析提供一定的依据。

In this paper, in order to compute and analyze stress and strain of the impeller blade of a large type centrifugal compressor, the fluid-solid coupling technique is adopted to solve the fluid and solid coupling equation of design condition and winter condition. The blade stresses mainly include tensile stress caused by centrifugal force, and bending stress caused by flow-field pressure in theory. In numerical simulation, the major influence factor is tensile stress caused by centrifugal force but it is also important that is bending stress caused by flow-field pressure. The simulation results indicate that there is an error of the situation of dangerous work face in single mechanical analysis; the fracture position of blade conforms to reality, and this provides a＆nbsp;certain numerical simulation basis for the accident analysis in practice.