The Experiment Research on the Performance of Low Speed Axial-Compressor by External Acoustic Excitation

Abstract

This paper investigates the control of large-scale separated flows inside a low-speed axial-compressor by using external acoustic excitations. Experiment studies on the characteristics of flow field and the performance of compressors under external unsteady acoustic excitations are carried out in a low speed axial-compressor. The results indicate that the excitation frequency and excitation amplitude are of key importance for controlling large-scale separated flows. When the unsteady excitation is of the most effective frequency with proper amplitude, the large-scale separated flow is controlled effectively and the flow field becomes more regular near the compressor’s stall margin. At the same time, the performances of the compressor are enhanced: the efficiency is increased by about 1∼2%, the pressure ratio is increased by 2∼3% and the stall margin of the compressor is broadened remarkably too.