Advances and challenges in explaining fuel spray impingement: How much of single droplet impact research is useful?

The impingement of fuel spray onto interposed surfaces in an IC engine, equipped either with a direct or an indirect injection system, is a fundamental issue affecting mixture preparation prior to combustion and, therefore, also affecting engine performance and pollutant emissions. In this context,...

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Bibliographic Details
Published in:	Progress in energy and combustion science Vol. 36; no. 5; pp. 554 - 580
Main Authors:	Moreira, A.L.N., Moita, A.S., Panão, M.R.
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 01-10-2010 Elsevier
Subjects:	Applied sciences Combustion. Flame Droplet-wall collision Droplets Dynamical systems Dynamics Energy Energy. Thermal use of fuels Exact sciences and technology Fuel spray Fuel sprays Impingement Internal combustion engines Spray-wall impingement Sprayers Sprays Theoretical studies. Data and constants. Metering Fuel spray Spray-wall impingement Droplet-wall collision Fluid dynamics Combustion Review Droplet Flame propagation Pollutant emission Flame structure Fuel injection Performance Direct injection
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Summary:	The impingement of fuel spray onto interposed surfaces in an IC engine, equipped either with a direct or an indirect injection system, is a fundamental issue affecting mixture preparation prior to combustion and, therefore, also affecting engine performance and pollutant emissions. In this context, the development of fuel injection systems relies on accurate knowledge of the fluid dynamic and thermal processes occurring during spray/wall interaction. Injection systems however, are very complex and the background physics requires fundamental studies, performed at simplified flow geometries. In particular, the impact of individual droplets has been extensively used to describe the behaviour of spray impact and to predict its outcome, despite the known fact that a spray does not behave exactly as a summation of individual droplets; then, researchers incorporate all the governing parameters. The present paper offers a critical review of the investigations reported in the literature on spray-wall impact relevant to IC engines, in an attempt to address the rationale of describing spray-wall interactions based on the knowledge of single droplet impacts. Moreover, although the review was first aimed at fuel-spray impingement in IC engines, it also became relevant to provide a systematization of the current state of the art, which can be useful to the scientific community involved with droplet and spray impingement phenomena.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0360-1285 1873-216X
DOI:	10.1016/j.pecs.2010.01.002