Measurements of the Tip-gap Turbulent Flow Structure in a Low-speed Compressor Cascade

作者: Genglin Tang , Roger L Simpson

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摘要: Abstract : Experimental results are presented from a study of the tip-gap turbulent flow structure in low-speed linear compressor cascade wind tunnel at Virginia Tech that includes moving belt system to simulate relative motion between tip and casing. Endwall pressure measurements surface oil visualizations were made on stationary endwall obtain some global features. A custom-made miniature 3-orthogonal-velocity-component fiber-optic laser-Doppler velocimeter (LDV) with 50 micron spherical measurement volume was used measure all three components instantaneous velocity within gap blade tip, mainly for wall 1.65% 3.30% chord gaps, as well initial experiments wall. The skin friction obtained by using viscous sublayer profiles, which verified presence an intense lateral shear layer observed visualizations. All second- third-order turbulence quantities presented. Tip flows complex, pressure-driven, unsteady highly skewed three-dimensional flows. crossflow normal is nearly uniform mid changes substantially suction side due local loading, different mid-span loading because leakage vortex influence. Normalized circulation independent size. interacts primary flow, separates endwall, rolls up form vortex, TKE transport vector Other than nearest regions, does not vary much gap. produces high intensities.

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