Minimizing the Loss Produced by a Turbulent Separation Using Vortex Generator Jets

作者：Evans Simon^*; Coull John; Haneef Ibraheem; Hodson Howard

来源：AIAA Journal, 2012, 50(4): 778-787.

DOI：10.2514/1.J050790

Vortex generator jets have been applied to control a separating, turbulent boundary, layer on the suction surface of compressor blades in a linear cascade at high incidence. With the jets operating in a steady blowing mode, loss measurements were taken over a range of jet velocities, yielding a loss reduction of 61 % relative to the uncontrolled case for a blowing ratio of 70%. Higher jet velocities yielded a slight increase in the loss coefficient. To explore the behavior of the boundary layer over this range of blowing ratios, a comprehensive set of experiments was performed, including static pressure measurements, wall shear stress measurements, stereoscopic particle image velocimetry, and a smoke-flow visualization study. The experiments showed that the minimum loss coefficient is achieved for a blowing ratio required to just keep the boundary layer attached. A vortex that migrates in the span wise direction was identified downstream of each jet. Shear stress is elevated beneath the vortex core and in a secondary flow region between the vortices created by adjacent jets, suggesting the importance of the secondary flow in contributing to the separation delay and loss reduction achieved by vortex generator jets.

• 出版日期2012-4