The Aerodynamic Design Of An Axial Turbine And Strength Analysis

With the development of technology, the aviation engine becomes more and more important in the national economy and defense. The turbine is the main component of the aviation engine, whose design is paid increasingly attention to by many countries. With the development of the modern high load turbine, the flow condition in the blade channel becomes more and more complex and high speed, often associated with transonic flow and even supersonic flow. Therefore, the focus of attention is paid on the theories and methodologies of transonic turbine, as well as numerical simulation and performance improvement by the scholars at home and abroad in the recent years.The energy loss in the transonic turbine mainly include the end walls corner loss, tip leakage loss and the shock loss in the roots of the stator and the upper part of the rotor. In this paper, the controller vortex design is chosen, which can effectively improve the reaction degree in the roots, and can reduce it at the top. It can reduce the shock strength and shock region in the turbine guide vane by increasing the reaction degree in the roots. The decrease of the reaction degree at the top can weaken the shock strength and shock region. The results show that it's an important method to design a high aerodynamic performance transonic turbine, that blade angle and thickness are adjusted cross the blade section and along the meridian to make the profile aerodynamic load allocated rationally. Furthermore, a swept blade design is applied to show the C-type blade pressure distribution, which can make the fluid in the middle entrainment the loss energy fluid at in the end walls corner, enhance the trend of the fluid toward the middle from both ends. It can reduce the end walls corner loss at both ends to improve the turbine aerodynamic performance.In this paper, do the 1-D and 3-D aerodynamic design according to the design requirements, and apply the controlled vortex design to generate the blade geometry. With the commercial software CFX 3-D aerodynamic calculation results, trim the geometry to meet the design requirements. We analyze the 3-D flow field in the design conditions and study the improvements compared to the original design. Analyze the mass and efficiency performance off the design conditions. Finally, the strength analysis and check are done for the new design turbine coupled with the pressure and temperature field, which meet the strength requirements. The turbine design is successful.