High Frequency Boundary Layer Actuation by Fluidic Oscillators at High Speed Test Conditions

摘要: Detailed investigations of high frequency pulsed blowing and the interaction with boundary layer at speed test conditions were performed on a flat plate pressure gradient. This experimental testbed features imposed suction side flow an aerodynamically highly loaded low turbine profile. For actuation, newly developed coupled fluidic oscillator independent mass characteristic was tested successfully. Several operating points investigated one profile equivalent point Reynolds number 70,000, theoretical outflow Mach 0.6, inflow free stream turbulence level 4%. The examined range between 6.5 7.5 kHz actuation rates varied 0.68% 1.32% overall passage flow. As result, separation transition can be controlled losses even halved. Differences in different are also presented discussed.