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Study of Vortices Embedded in Boundary Layers with Film Cooling.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Measurements are presented of boundary layers with embedded vortices and with filmcooling for freestream velocities of 15, and 11 ms. Measurements of a boundary layer with embedded vortex and no film cooling, and of a boundary layer with film cooling but no vortex are presented for freestream velocity of 15 ms. Plots of total velocity, V, streamwise velocity, V sub x, secondary flow vectors, total pressure, P sub o, and streamwise vorticity are presented for many of these test conditions. The results show that the embedded vortices completely dominate the flow field in boundary layers with film cooling. This is indicated from the plots of V, V sub x, and P sub o which show the effects of film cooling to be completely decimated in the vicinity of the vortex. In order to conduct this study, a five hole pressure probe was calibrated for pitch and yaw. The probe was then used to measure five pressures associated with the flow. From these pressures, total velocity and the x, y, and z components of velocity were determined. A boundary layer profile was conducted to verify the calibration of the pressure probe, measurement procedures, and velocity computations. The results show expected boundary layer behavior with a small V sub y and V sub z component. Theses
APPROVED FOR PUBLIC RELEASE