An Experimental Investigation of the Effect of Freestream Turbulence on the Wake of a Separated Low-Pressure Turbine Blade at Low Reynolds Numbers
Author:
Murawski C. G.1, Vafai K.2
Affiliation:
1. AFRL/PRTT, Bldg 18, 1950 Fifth Street, WPAFB, OH 45433-7251 2. Ohio State University, Department of Mechanical Engineering, 206 W. 18th Avenue, Columbus, OH 43210-1107
Abstract
An experimental study was conducted in a two-dimensional linear cascade, focusing on the suction surface of a low pressure turbine blade. Flow Reynolds numbers, based on exit velocity and suction length, have been varied from 50,000 to 300,000. The freestream turbulence intensity was varied from 1.1 to 8.1 percent. Separation was observed at all test Reynolds numbers. Increasing the flow Reynolds number, without changing freestream turbulence, resulted in a rearward movement of the onset of separation and shrinkage of the separation zone. Increasing the freestream turbulence intensity, without changing Reynolds number, resulted in shrinkage of the separation region on the suction surface. The influences on the blade’s wake from altering freestream turbulence and Reynolds number are also documented. It is shown that width of the wake and velocity defect rise with a decrease in either turbulence level or chord Reynolds number. [S0098-2202(00)00202-9]
Publisher
ASME International
Subject
Mechanical Engineering
Reference7 articles.
1. Sharma, O. P., Ni, R. H., and Tanrikut, S., 1994, “Unsteady Flows in Turbines-Impact on Design Procedure,” AGARD-LS-195, Paper No. 5. 2. Baughn, J. W., Butler, R. J., Byerley, A. R., and Rivir, R. B., 1995, “An Experimental Investigation of Heat Transfer, Transition and Separation on Turbine Blades at Low Reynolds Number and High Turbulence Intensity,” ASME Paper No. 95-WA/HT-25. 3. Qiu, S., and Simon, T. W., 1997, “An Experimental Investigation of Transition as Applied to Low Pressure Turbine Suction Surface Flows,” ASME Paper No. 97-GT-455. 4. Bons, J. P., Sondergaard, R., and Rivir, R. B., 1999, “Control of Low-Pressure Turbine Separation Using Vortex Generator Jets,” AIAA Paper No. 99-0367. 5. Murawski, C. G., Sondergaard, R., Rivir, R. B., Vafai, K., Simon, T. W., and Volino, R. J., 1997, “Experimental Study of the Unsteady Aerodynamics in a Linear Cascade with Low Reynolds Number Low Pressure Turbine Blades,” ASME Paper No. 97-GT-95.
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