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Unformatted text preview: rs caused large changes in performance. The Bernoulli equation seemed highly suspect as a useful tool. Neglecting losses and gravity effects, the incompressible Bernoulli equation predicts that | e-Text Main Menu | Textbook Table of Contents | Study Guide 382 Chapter 6 Viscous Flow in Ducts 100 b 1 2 2θ W1 c Jet flow 70 W2 Transitory stall a 2 θ , degrees 20 L (a) Bistable steady stall c b 40 b Maximum unsteadiness 10 7 Cp max 4 L No stall 2 2θ D De a 1 1 2 4 7 Throat 10 L W1 20 40 100 Exit (c) (b) Fig. 6.26 Diffuser geometry and typical flow regimes: (a) geometry of a flat-walled diffuser; (b) geometry of a conical diffuser; (c) flatdiffuser stability map. (From Ref. 14, by permission of Creare, Inc.) 1 2 p V2 p0 const (6.112) where p0 is the stagnation pressure which the fluid would achieve if the fluid were slowed to rest (V 0) without losses. The basic output of a diffuser is the pressure-recovery coefficient Cp, defined as pe p0t Cp pt pt (6.113) where subscripts e and t mean the exit and the throat (or inlet), respectively. Higher Cp means better performance...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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