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The tip clearance gap leakage flow is of continuing concern in reducing efficiency losses that occur within turbines. Active flow control using a blade-tip-mounted unsteady plasma actuator was implemented in a low pressure linear turbine cascade. Downstream flow velocity and pressure were acquired using a five-hole probe to document changes in leakage vortex size and strength. Due to the large flow angles seen in the leakagevortex at a 4% gap size, the probe was unable to acquire the downstream pressure becausethe calibration region of the probe was exceeded. The extensive three-dimensionality ofthe flow field in the tip region has proven difficult to measure for low velocities. However,for the smaller 1.56% gap, the leakage vortex size is reduced over the 4% gap, which allowsfor measurement of actuator effectiveness on the downstream flow field. The use of active flow control has shown a beneficial change in the downstream wake in the blade tipregion in a low pressure linear turbine cascade for Reynolds numbers of 105 and 5*104 at a tip gap height of1.56%. Changes in the location of the vortex structures is seen with vorticity contours and criterion forboth Reynolds numbers. 4.6. Control of laminar and turbulent shear flows using plasmaactuators Jamey D. Jacob and KarthikRamakumar The use of AC discharge plasma actuators in flow control applications is experimentally investigated using PIV. Experimental observations include actuators in quiescent flow, a flat plate boundary layer, and a low pressure turbine blade cascade. The actuators are shown to generate a high velocity region near the wall downstream of the interface withlarge fluctuating components. Even in cases where the velocity increase is small due to a fast free-stream flow, theactuator still produces velocity fluctuations of significant size. Plasma actuators, also known as discharge plasma, dielectric barrier discharge, and glow discharge actuators, offer unique options in shear flow control applications. A number of researchers have investigated plasma actuators over recent years, and the present work discusses further experimental investigations,both from a perspective of better 13PDF Image | PLASMA FUNCTIONALIZATION OF MULTI-SCALE STRUCTURES
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