Abstract
To overcome the limitations posed by three-dimensional corner separation,this paper proposes a novel flow control technology known as passive End-Wall(EW)self-adaptive jet.Two single EW slotted schemes(EWS1 and EWS2),alongside a combined(COM)scheme featuring double EW slots,were investigated.The results reveal that the EW slot,driven by pressure differ-entials between the pressure and suction sides,can generate an adaptive jet with escalating velocity as the operational load increases.This high-speed jet effectively re-excites the local low-energy fluid,thereby mitigating the corner separation.Notably,the EWS1 slot,positioned near the blade leading edge,exhibits relatively low jet velocities at negative incidence angles,causing jet separation and exacerbating the corner separation.Besides,the EWS2 slot is close to the blade trailing edge,result-ing in massive low-energy fluid accumulating and separating before the slot outlet at positive inci-dence angles.In contrast,the COM scheme emerges as the most effective solution for comprehensive corner separation control.It can significantly reduce the total pressure loss and improve the static pressure coefficient for the ORI blade at 0°-4° incidence angles,while causing minimal negative impact on the aerodynamic performance at negative incidence angles.Therefore,the corner stall is delayed,and the available incidence angle range is broadened from-10°--2° to-10°-4°.This holds substantial promise for advancing the aerodynamic performance,operational stability,and load capacity of future highly loaded compressors.
基金项目
National Natural Science Foundation of China(52106057)
National Major Science and Technology Projects of China(2017-Ⅱ-0001-0013)
Fundamental Research Funds for the Central Universities of China(D5000210483)
Foundation of State Level Key Laboratory of Airfoil and Cascade Aerodynamics of China(D5150210006)
Foundation of State Level Key Laboratory of Airfoil and Cascade Aerodynamics of China(D5050210015)
Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University of China(CX2023012)
NETL
NSTL
万方数据