TURBULENT-FLOW MEASUREMENTS BY LASER-DOPPLER ANEMOMETRY IN MOTORED PISTON-CYLINDER ASSEMBLIES

被引：37

作者：

MORSE, AP

WHITELAW, JH

YIANNESKIS, M

机构：

[1] Imperial College of Science and Technology, Department of Mechanical Engineering, Fluids Section, London

来源：

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 1979年 / 101卷 / 02期

关键词：

D O I：

10.1115/1.3448937

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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. © 1979 by ASME.

引用

页码：208 / 216

页数：9

共 9 条

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