Gas Turbine Transpiration Cooling Research. Part I. An Experimental Study of Turbine Airfoil Wakes as Influenced by Upstream Nozzle Vanes.
Final rept. 1 Jan 73-30 Sep 75,
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
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An experimental study was made of the effects of stationary upstream wakes on the static pressure distribution and wake profiles of a downstream cascade of turbine blade models. The most significant cyclic static pressure changes on the downstream airfoils were found to take place along the suction surface and near the stagnation region of an instrumented airfoil. The wake minimum velocity was found to be displaced toward the suction side of the airfoil by the addition of an upstream cascade, although no significant change was found to occur when the relative position of the cascades was changed. The results suggest that an upstream cascade may effectively be modeled as an increase in free-stream turbulence for predicting its effects on the downstream wakes.
- Fluid Mechanics
- Jet and Gas Turbine Engines