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Analysis of Flow Distortion Effects in Two Dimensional Offset Diffusers
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English
Abstract
Conformal transformation analysis is used to define the potential flow variation along the walls of two-dimensional offset diffusers. The incompressible flow parameters are converted to compressible parameters by the Karman-Tsien approximation. The compressible velocity versus distance data from the transformation theory define the pressure gradients experienced by turbulent boundary layers along these walls. Solutions of the momentum and energy equations define the boundary layer separation characteristics.
Experimental water table studies of two offset diffuser models designed to produce separated and nonseparated flows, respectively, have been accomplished. The test results provide a preliminary substantiation of the theory.
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Brees, D., "Analysis of Flow Distortion Effects in Two Dimensional Offset Diffusers," SAE Technical Paper 620298, 1962, https://doi.org/10.4271/620298.Also In
References
- Churchill Ruel V. “Complex Variables and Applications,” 2nd New York McGraw-Hill Book Co., Inc. 1960
- Shapiro A. H. “The Dynamics and Thermodynamics of Compressible Fluid Flow,” 1 New York The Ronald Press Co. 1953
- Schlichting H. “Boundary Layer Theory.” New York Pergamon Press 1955
- Schlichting H. Pechau W. “Lift Increase of Wings by Continuously Distributed Suction.” Neffgen Franziska M. December 1960 Boeing Scientific Research Laboratories Translations, D1-82-0088T
- Sandborn V. A. Kline S. J. “Flow Models in Boundary-Layer Stall Inception,” J. Basic Eng. September 1961 317 ASME Paper No. 60-WA-149
- Moore C. A. Kline S. J. “Some Effects of Vanes and of Turbulence in Two-Dimensional Wide-Angle Subsonic Diffusers,” NACA TN 4080 June 1958