Fuel Droplet Entrainment Studies for Minimization of Cold-Start Wall-Wetting

Abstract

A method of investigating intake-port wall-wetting via liquid phase entrainment into the gas phase was developed using a single-cylinder port fuel injected CFR engine and externally-clocked single-component phase-doppler anemometry. The effects of fuel drop size, injection timing and valve timing on drop trajectory and entrainment into the gas phase flow were examined. It was found that entrainment of the liquid phase into the gas phase is a function of both drop size and of the local rate of change of the gas phase velocity vector. It is suggested that drop size distribution instead of a simple mean size should be considered when evaluating the performance of an injector. It appears that for a fuel drop to be entrained, small drops must be generated and introduced during a period of time with low gas phase velocity vector gradients. © Copyright 1995 Society of Automotive Engineers, Inc.

Department(s)

Mechanical and Aerospace Engineering

International Standard Serial Number (ISSN)

0148-7191

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1995 SAE International (Society of Automotive Engineers ), All rights reserved.

Publication Date

01 Jan 1995

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