Pressure Losses in Combining Subsonic Flows Through Branched Ducts

[+] Author and Article Information
N. I. Abou-Haidar

Department of Engineering, University of Leicester, Leicester, United Kingdom

S. L. Dixon

Department of Mechanical Engineering, The University of Liverpool, Liverpool, United Kingdom

J. Turbomach 114(1), 264-270 (Jan 01, 1992) (7 pages) doi:10.1115/1.2927994 History: Received January 16, 1990; Online June 09, 2008


An investigation of the “additional” total pressure losses occurring in combining flow through several sharp-edged three-leg junctions has been made. Experimental results covering a wide speed range up to choking are presented for three flow geometries of a lateral branch off a straight duct using dry air as the working fluid. A new theoretical flow model provided results in fairly good agreement with the experimental data obtained. Flow visualization of the high-speed flow using the Schlieren method revealed the presence of normal shock waves in the combined flow about one duct diameter downstream of the junction. The highest attainable Mach number (M3 ) of the averaged downstream (combined) flow was 0.66 for several of the flow geometries. This value of M3 appears to be the maximum possible and is the result of a combination of flow separation and local flow choking.

Copyright © 1992 by The American Society of Mechanical Engineers
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