Turbocharger Impeller Structure Strength Analysis In Multi Field Coupling Conditions

Turbocharger can greatly improve the engine power and torque , reduce harmful gas intail gas without increasing the delivery capacity of engine. It has become the gasoline engine,diesel engine with high performance matching device.The gas flow in vehicle turbocharger ispulsation of unsteady flow ,at the same time the temperature of the gas is high, greatlyimprove the turbine load becomes the current advanced turbine engine design importanttechnical pursuit. Using the fluid-solid coupling method in field under the condition of theturbine impeller structure strength analysis can simulate the actual situation, the calculatedresults are more accurate, credible.This paper argues that the blade deformation and other factors caused by the change offlow field phenomenon will not be considered with studying of the fluid structure Interactiontheory.It analysis the weakly interaction with CFX-ANSYS software.At first ,the papercalculate the flow field of the exhaust gas region in steady, through the comparison withexperimental results shows that the calculation results of the stability,then do transientcalculation on the basis of the result.The computational result is mapped to the turbine bladesby using surface effect element on the calculation of the temperature field of turbine impeller.In considering the centrifugal force of the rotation, thermal stress, leaf surface airflowexciting-vibration force of these three factors in the case of the turbine impeller structurestrength analysis. In the whole cycle of integral impeller exhaust, temperature fluctuations inthe range of 770K-1072K, stress fluctuation range in 131MPa-686MPa, strain fluctuationrange in 0.594mm-1.790mm.The conclusion of this paper has some reference value in analysis of the structurestrength and improved design of this type turbocharger.