Hybrid Flow Control on Boundary Layer Ingestion Inlet

Abstract

For the boundary layer ingestion (BLI) inlet, how to control the flow is very important to improve the quality of the air flow at the outlet. In this paper, the research on the passive flow control is carried out by using rectangular straight spoiler blades, and the active flow control is carried out by using the blowing pipes. Finally, the effect of hybrid flow control is explored by combining the passive flow control device and the active flow control device. The results show that the spoiler blades can squeeze the low pressure zone to both sides of the outlet and reduce the area of the low pressure zone. The steady-state circumferential distortion coefficient of the outlet can be reduced by 66.7% by adopting the appropriate passive flow control scheme. The blowing rate of active flow control has a significant effect on the flow control effect. The optimal hybrid flow control scheme is obtained by optimization and the steady-state circumferential distortion coefficient can be reduced by 76.8% when the blowing flow rate is 0.67% of the inlet flow.