Finite Element Analysis On Turbocharger Turbine Box Based On The Theory Of The Fluid-structure Coupling

With the development of turbocharger technology, the components in aturbocharger work under increasingly severe conditions. The parts, such as theturbine box, work under heavier thermal loads while the stability of turbocharger islargely dependent on the thermal stress of the turbine box. The researches around theworld focus mainly on the turbine blades and bearings while the researches ontemperature field and thermal fatigue in turbine box are not thorough enough. Basedon the principle of heat-transfer in the turbine box on a turbocharger, this thesispresent a numerical simulation of a turbine box applying fluid-solid coupling withproofs by tests. The research work and creativity of this thesis are as follows:(1) Based on the flow of high-temperature exhaust gas in the turbine box, theheat transfer on the box and the principle of conjugated heat transfer on the surfaceof fluid-solid coupling, this thesis established for the first time the mathematicalmodel of fluid-solid coupling in a turbine box and performed a numericalcomputation using the solving strategy of sequential coupling and the method ofserial coupling.(2) With the help of fluid software STAR-CCM+and FEM software ABAQUS,a simulation result of temperature field in the turbine box under steady workingcondition is obtained. The distribution of thermal stress field is derived by furtheranalysis.(3) According to the principle of turbocharger test, the layout of the test bedand the test process are determined. On the one hand, the validity of fluid-solidcoupling simulation result can be proved by the test, on the other hand, more preciseboundary conditions of the numerical simulation can be provided by the test. At thesame time, the influence on the turbine box caused by the flux and temperature ofexhaust gas and different intake conditions are analyzed.