Impact of Boundary Layer Suction on Clearance Leakage Flow in a Cantilever Stator of Transonic Compressor

Abstract

To control secondary flow effects and enhance the aerodynamic performance of the compressor, the flow control effects of the flow suction at the endwall with different circumferential positions and at the blade tip were numerically investigated in the cantilever stator of an axial single-stage transonic compressor. The main purpose was to gain a better understanding of the application of boundary layer suction and the associated control mechanisms in the cantilever stator. The studies show that the optimal position of the endwall suction slot should be located up the stator blade, in terms of the leakage flow structures and the blade tip unloading effect. In addition, the flow control effects of the suction at the blade tip on leakage flow upstream is better than that of the endwall flow suction with the same structure. Further, the studies of compressor aerodynamic performance curves illustrate that the efficiency and pressure ratio is increased by 0.34% and 1.09% at the peak efficiency point, and are increased by 0.39% and 0.14% at the near stall point, respectively.

Passive Control with Blade-End Slots and Whole-Span Slot in a Large Camber Compressor Cascade

“…The internal flow control methods of compressors are mainly divided into: (1) Active control methods, which include boundary layer suction (Mao et al 2018;Zhang et al 2020), plasma excitation (Akcayoz et al 2016), etc. (2) Passive control methods, which include end-bend blade (Kan et al 2020), casing treatment (Cevik et al 2016)，vortex generator (Hergt et al 2012;Ma et al 2018) and slotted blade, etc. However, compared with the active control methods, the passive control methods don't need extra complicated additional devices.…”