Turbulent Flow Measurements by Laser-Doppler Anemometry in Motored Piston-Cylinder Assemblies

[+] Author and Article Information
A. P. Morse, J. H. Whitelaw, M. Yianneskis

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

J. Fluids Eng 101(2), 208-216 (Jun 01, 1979) (9 pages) doi:10.1115/1.3448937 History: Received July 14, 1978; Online October 12, 2010


Laser-Doppler anemometry has been used to quantify the mean velocity and turbulence characteristics of the isothermal, incompressible flow within a piston-cylinder arrangement motored without compression at 200 rpm and with idealized inlet geometries corresponding to a pipe and to an annular port located in the centre of the cylinder head. The results indicate that the pipe entry gives rise to a strong vortex near the piston as the indrawn air is deflected radially along the piston face and cylinder wall; this, in turn, gives rise to a weaker, counter-rotating vortex near the cylinder head which grows appreciably as the piston approaches bottom-dead-centre. With the annular-port entry, the inlet jet is angled and results in a flow pattern with a large vortex occupying nearly all of the flow space with much smaller vortices at the corners between the wall and the piston and cylinder heads. The effect of a piston bowl was also investigated for the port entry and is shown to be small.

Copyright © 1979 by ASME
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