Effect of tip winglets on stable operating margin of transonic compressor stage
In order to reveal the influence mechanism of tip winglet on the aerodynamic performance of the transonic compressor stage,the aerodynamic characteristics and stability expansion mechanism of compressor stage rotors with different width pressure-side/suction-side tip winglets were studied by numerical method.At the same time,a more systematic structural design method of tip winglet was proposed to optimize the application of tip winglet technology in compressor and improve its stable operating margin on the premise that the pressure ratio and adiabatic efficiency of the compressor stage are kept basically unchanged.The results showed that with the increase of pressure-side tip winglet width,the stable operating margin of the compressor stage increased by 6.01％,9.90％,10.76％and 11.43％,respectively.The tip winglet changed the rotor tip flow angle,inhibited the generation of the leakage and the break of the leakage vortex at the tip of rotor blades,improved the flow capacity of the passage,and reduced the separation loss of suction-side stator blades.
tip wingletstransonic compressor stagetip leakage flowstable operating marginexpansion mechanism
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