Valve and In-Cylinder Flow Generated by a Helical Port in a Production Diesel Engine

[+] Author and Article Information
C. Arcoumanis, C. Vafidis, J. H. Whitelaw

Imperial College of Science and Technology, Department of Mechanical Engineering, Fluids Section, London SW7 2BX, United Kingdom

J. Fluids Eng 109(4), 368-375 (Dec 01, 1987) (8 pages) doi:10.1115/1.3242675 History: Received January 21, 1986; Online October 26, 2009


The flow generated by the helical port of a production Diesel engine has been investigated by laser Doppler anemometry under steady flow and operating conditions at ∼ 900 rpm and compression ratio of 8. The flow around the valve periphery was found to be non-uniform with the axial velocity distribution being more sensitive to valve lift. The in-cylinder swirl distribution at inlet valve closure exhibited an axial stratification in the disc-chamber while turbulence intensity remained constant in the clearance volume during the rest of the compression stroke with levels of 0.5 v p and a minimum of about 0.4 v p at top-dead-center following a rapid decay at θ=340°.

Copyright © 1987 by ASME
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