Effect and Suppression of Throat Jet Flow of Volute on Excitation Force of Radial Turbine Blades
The turbine blades of turbocharger are subject to periodic aerodynamic excitation during rotation,and excessive aerodynamic excitation may lead to high cycle fatigue(HCF)of turbine blades.In bladeless volute,the aerodynamic excitation mainly comes from pressure fluctuations at the volute tongue position.To reduce the excita-tion force of turbine blades,a pressure fluctuation suppression measure by diverting the high-pressure gas from the inlet section of the volute housing to the low static pressure region upstream of the volute tongue was proposed based on the source of excitation generation.The improvement of turbine blade excitation force and its effect on the turbine performance of high-pressure gas introduced through the volute throat jet flow were investigated using an unsteady flow field numerical simulation method.The results show that the measure can significantly weaken the radial turbine blade excitation force.The excitation amplitude of the measuring point in the high amplitude region of the blade is reduced by up to 34%,and the effect of the jet hole on the turbine efficiency can be negligible while weakening the excitation force.
万方数据
维普
