| As the improvement of the engine power and economic performance and the increasingly strict emission regulations,the turbocharger is widely used in many areas. As an important part of turbocharger, the turbine directly contacts with high temperature,high pressure and high speed gas for a long time, and it works at the comprehensive action of centrifugal loads, aerodynamic loads and thermal loads,the working environment is harsh, and the reliability of the supercharge is the basis of the turbocharger working effectively, so it is necessary to analyze the work intensity of the turbine.In the previous studies about the work intensity,only single load was considered, while in reality, the turbine stresses many loads, so considering all loads is more practical. According to natural science foundation of Hunan province(10JJ6080) and state key laboratory of advanced design and manufacturing for vehicle body(61075002), a turbocharger equipped in an engine has been studied in this paper, and strength analysis of the turbine was carried out based on fluid-solid coupling method. Ignoring the impact of the blade deformation on the flow field, a fluid-solid coupling simulation model for turbine was established. With the help of fluid software STAR-CCM+ and FEM software ABAQUS, this paper calculated the turbine flow field in steady, and obtained the computational result of pressure and temperature in the turbine flow field. The simulation result is mapped to the turbine blades by a form of load, and then calculates the temperature field of turbine inner. Finally, respectively considering the changes of turbine stress in the centrifugal force, aerodynamic loads and thermal loads, getting the stress distribution in each area of turbine, then find out the dangerous stress area, which has a great reference value for the design and development of turbine structure reliability. This paper has some reference value in the reliability and design of the turbocharger structure. |
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