The Research Of The Advanced Turbine Stage Design Rule

As an important component of gas-turbines, low-pressure turbines have a great influence on its quality and efficiency. At present, performance of turbines have reached a higher level, now, its target is more efficient and higher-loaded. With the development of application and the tremendous progress of CFD method in the calculation, we now have expanded to include the design and testing of a number of advanced vortex stage designs.Firstly, this thesis analyzed the first stage design data of the low-pressure turbine of one gas-turbine,and also achieve the simulation of the first stage by NUMECA software.Secondly, the overall stage redesign with the controlled vortex concept was carried out. In this paper, three types of controlled vortex schemes were presented. Through control the inlet and outlet flow angle and the stagger angle we computed the parameters for 7 sections along the wingspan. After the comparison of the new stages and the original one, it was represented that the controlled vortex techniques have the ability of equaling degree of reaction. After that, local swirl controlled technique was used on considering the viscous effects. Reasonable swirl redistribution nearby the endwalls has a special ability to improve local degree of reaction of drastic change due to the viscous effects nearby the endwalls, also improved the power of the turbines.Finally, numerical simulation was carried out to investigate the influence of blade bowing and sweeping technique which combined effects of bowing, sweeping and twisting controlled vortex flow on the aerodynamic performance. Simulation results are presented and it shows that swept stages have better aerodynamic performance than bowed one. The independence of computing grid is good, computing results in accord with design parameters well and the results are believable.