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Velocity Measurements In Motored Engines - Experience and Prognosis
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English
Abstract
Measured values of velocity and associated turbulence properties have been obtained in a motored single-cylinder Diesel engine and in a plexiglass simulation engine. The quality of the signals obtained from thereal engine and the corresponding useful data rate are quantified and discussed. As a consequence, it is shown that measurements in real engines are likely to relate to crank-angle intervals of the order of 10 degrees. The implications of this conclusion are quantified by analysis and by measurements in the plexiglass engine.
The results, from the motored Diesel engine, also show that values of velocity cannot be measured throughout the cylinder cavity. It is argued that best advantage can be obtained from laser-Doppler anemometry by conducting a small number of measurements in a real engine; demonstrating that these correspond closely to corresponding measurements in a plexiglass engine with the same geometrical arrangement; and using the plexiglass engine to determine the influence of important parameters such as piston-crown shape, head shape, valve arrangements etc.
Authors
Citation
Hutchinson, P., Morse, A., and Whitelaw, J., "Velocity Measurements In Motored Engines - Experience and Prognosis," SAE Technical Paper 780061, 1978, https://doi.org/10.4271/780061.Also In
References
- Gosman A.D. Melling A. Watkins A.P. Whitelaw J.H. “Axisymmetric laminar flow in a motored reciprocating engine” Imperial College, Mech. Eng. Dept. 1977
- Melling A. “Axisymmetric turbulent flow in a motored reciprocating engine.” Imperial College, Mech. Eng. Dept. 1977
- Morse A. “The effect of crank-angle broadening on laser-Doppler measurements in reciprocating engines.” Imperial College, Mecha. Eng. Dept. 1977
- Melling A. Whitelaw J.H. “Design of laser-Doppler anemometers for reciprocating engines.” Imperial College, Mech. Eng. Dept. 1976
- Wigley G. Hawkins M.G. “Three-dimensional velocity measurements by laser anemometry in a Diesel-engine cylinder under steady state inlet flow conditions” SAE Meeting Detroit 1977
- Gosman A.D. Watkins A.P. “A computer prediction method for turbulent flow and heat transfer in piston/cylinder assemblies” Proc. of Symposium on Turbulent Shear Flows Penn. State University 1977
- Self S.A. whitelaw J.H. “Laser anemometry for combustion research.” Comb. Sci. and Technology 13 171 1976