Multi Objective Optimization of a Supersonic Axial Turbine Blade Row Shape for a Rocket Engine Turbopump

摘要

A rocket engine should be small and low weight, therefore, a turbopump for a rocket engine must be smaller and have higher rotation speed than a conventional pump. However, to achieve high thrust, the required power of the pump should be high enough to achieve high specific impulse and thrust. To attain these requirements, a study of design optimization with generic algorithm was applied to blade row shape of the supersonic axial turbine. In this study, a multi-objective optimization was carried out to obtain a tradeoff tendency between multi-objective functions, turbine performance and turbine structural strength. In the present optimization, unsteady CFD was carried out in each optimization population to estimate turbine efficiency more clearly since shock interaction between stator and rotor is one of the most important points for supersonic turbine performance estimation. The optimized result showed that there is a strong tradeoff between turbine efficiency and diameter. The tradeoff information can be used to improve turbopump performance to satisfy requirements as a component of a rocket engine.