Abstract
Abstract : The periodic fluctuation of velocity in the boundary layer due to forcing of Vortex Generator Jets (VGJs) injected over the suction surface of the Pack-B turbine blade is reported. Blade Reynolds numbers in the turbine cascade match those that occur in aircraft engines while at high altitude cruise. The blowing ratio, a ratio of the jet velocity to the freestream velocity, was set to 2. The VGJs are pitched at 30 degrees and have a skew angle of 90 degrees to the freestream and are located in two rows at 45% and 63% axial chord. PIV data phase locked to the VGJ forcing was used to obtain planar velocity data around the blade. The phase locked PIV images reveal the fluctuation of the flow velocity in the boundary layer with respect to the pulsing period of the VGJ. This sheds light on the mechanism by which the VGJs suppress laminar separation over the blade suction surface.
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