Flow Separation Within the Engine Inlet of an Uninhabited Combat Air Vehicle (UCAV)

[+] Author and Article Information
Michael J. Brear

Department of Mechanical and Manufacturing Engineering, University of Melbourne, Australiae-mail: mjbrear@unimelb.edu.au

Zachary Warfield

Structures and Configuration Group, Mechanical Engineering Section, Jet Propulsion Laboratory

John F. Mangus, Jeffry S. Philhower

Integrated Systems, Northrop Grumman Corporation

Steve Braddom

Department of Civil & Mechanical Engineering, West Point

James D. Paduano

Gas Turbine Laboratory, Massachusetts Institute of Technology

J. Fluids Eng 126(2), 266-272 (May 03, 2004) (7 pages) doi:10.1115/1.1667885 History: Received March 17, 2003; Revised October 06, 2003; Online May 03, 2004
Copyright © 2004 by ASME
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Predicted velocity vectors and inferred flow topology a) along the inlet center-plane and b) near the top surface of the inlet
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An “owl-face of the first kind” 8
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Cross correlations at design massflow rate between a) the unsteady stagnation pressure probe 1 at the AIP in Fig. 3b and the hot-film sensor located at X in Fig. 7 and b) the two unsteady stagnation pressure probes at the AIP in Fig. 3b
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Predicted contours of a) Mach number and b) Pt/P along the center-plane of the inlet
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Experimental surface flow visualisation showing a) the bottom and b) the top surfaces of the inlet and c) the top surface’s separated region with inferred flow topology (lines) and the location of the hot-film sensor (white cross)
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Predicted static pressure along the top surface of the inlet
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Computed inlet flow showing contours of Pt/P at fixed axial locations (see Fig. 8 for scale) and Ps/P on the inlet surface
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Predicted a) secondary flow vectors and b) contours of Pt/P (see Fig. 3 for scale) at the AIP
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Contours of Pt/P at the AIP from experiment for a) low massflow rate (2.9 lb/s) and b) design massflow rate (3.6 lb/s), showing the location of the unsteady, stagnation pressure probes 1 and 2
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Measured and predicted πd as a function of the scaled inlet massflow
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Cross-section of experimental rig




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