某型涡轮增压器轴流涡轮强度和模态分析

Strength and Modal Analysis of the Turbocharger Axial Flow Turbine

涡轮增压器提高发动机的功率和扭矩具有重大作用,在船舶和汽车领域广泛应用,研究涡轮增压器轴流涡轮的强度及模态是十分必要的。针对模型涡轮增压器轴流涡轮,通过简化拉筋丝孔的模型,利用有限元分析其在最高结构转速及温度场下的工况进行强度及模态计算。计算结果表明,轴流涡轮应力计算时最大应力出现在叶根背弧处,影响应力值的因素有离心载荷和温度载荷,但离心载荷仍占主导地位。同时,对涡轮叶片模态的分析可知,涡轮叶片一阶固有频率大于3.5倍叶片基频,满足使用要求。计算结果证明该简化方式既可以满足实际要求,也对高膨胀比轴流涡轮的设计和分析具有一定的工程应用价值和实际指导意义。

It is very important to improving the power and torque of engine by useing the turbocharger that It is widely used in ships and automobiles, studying the strength and the modal analysis are very necessary. The strength and modal calculation of a turbocharger axial flow turbine under the highest structural speed and temperature field are carried out by the FEA.By simplifying the model of the lacing wire hole, the calculation results prove that the simplified method meets the actual requirements.The calculation results show that the maximum stress of the axial flow turbine is calculated at the back arc of the blade root. The factors affecting the stress are centrifugal load and temperature load, but the centrifugal load still dominates. At the same time, the analysis of the turbine blade mode shows that the first-order natural frequency of the turbine blade is greater than 3.5 times the blade fundamental frequency, which meets the requirements for use.the analysis method adopted in this paper has certain engineering application value and practical guiding significance for the design and analysis of high expansion ratio axial flow turbine.