The Thermo-mechanical Coupling Analysis And Test Research Of Turbine Housing

Turbochargers can effectively improve engine performance,emission and fuel economy.The working intensity of the engine becomes more higher,the working environment of the turbocharger becomes more worse,the thermal load of related parts is also increasing,the thermal stress of the turbine box largely determines the structural reliability of the turbocharger.In this paper,the cracking phenomenon of the exhaust valve hole is made in the test of a turbocharger,the method of numerical simulation and experiment is studied,the rationality of numerical simulation process in the design and development of turbine box is discussed.The structure optimization design is mainly carried out on the Angle of the vent valve hole;Based on the heat transfer mechanism of turbocharger turbine box,the flow-solid coupling method is used to simulate the turbine box,calculation and analysis of turbine box temperature field,turbine box heat-mechanical stress and strain,the temperature field and the dependent variable of the turbine box are measured.The test results show that:the results of coupled heat transfer,thermal stress and strain calculation in this paper are consistent with theactual situation,the numerical simulation process can provide some reference for the design and development of turbine box.The research work and innovation of the thesis are as follows:(1)Compared with the one-way coupling calculation used in the past,this paper uses the third-party software MPCCI to carry on the two-way flow solid coupling analysis,and does not require multiple artificial results mapping,the flow simulation of high-temperature exhaust gas in the FLUENT turbine box and the thermal analysis of ABAQUS turbine box structure can be carried out simultaneously,the independent calculation of the two independent calculations provides a more accurate boundary condition for the calculation of the thermal stress of the turbine box.(2)This paper uses a more complete boundary condition for the simulation of the turbine box(front temperature of the turbine,the rear temperature of the turbine,the front pressure of the turbine,and the rear pressure of the turbine),at the same time,the opening degree of the turbine box exhaust valve under different working conditions is controlled,so that it is closer to the actual working condition,which effectively guarantees the accuracy of simulation results.(3)Compared to the previous simulation of single turbine box parts,in this paper,considering that the adjacent parts of the turbine box produce thermal expansion at high temperature,extruding and deformingeach other,in the process of calculation,the simplified exhaust manifold,exhaust pipe,turbine rotor,air discharge valve and other heating components are added to make the temperature field simulation more accurate,moreover,the effect of thermal stress and thermal strain on the turbine box is simulated effectively,and the results are closer to the real working condition.