Combustion of Liquid Fuel Sprays by Alan Williams

By Alan Williams

This paintings covers the elemental conception of spray combustion. even though the emphasis is at the basic facets, a few commercial functions were defined, and the place attainable the textual content is augmented by means of appendices increasing definite quantitative features of the e-book. the improvement of spray combustion has successfully separate paths, one curious about engine functions during which the aerospace functions have ruled the sphere, the second one has been focused on desk bound apparatus equivalent to furnaces and boilers. mostly, textbooks were eager about one zone or the opposite and the article of this e-book is to stipulate the basics of the combustion of sprays in a unified means that could be utilized to any present or destiny technological program. over the past decade the need of controlling the emission of pollution has assumed better value in all features of combustion. extra lately the necessities were for pollutants keep an eye on and elevated combustion potency. sooner or later it is going to be essential to burn fuels that are of low or variable caliber or man made fuels having homes differing enormously from present-day fuels. For these kinds of advancements a better figuring out of spray combustion is needed

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Whether jets or sheets are produced their breakup in a twin-fluid atomiser is now much more controlled by the air (or steam) flow than is the case in a pressure jet atomiser. 8) is the density of air, V the velocity of air relative to the liquid, D Q the orifice diameter and the liquid surface tension. The Weber number gives a good indication of the quality of atomisation and is invoked in many expressions (sometimes indirectly) to give the mean droplet size. Considerable research and development efforts have been devoted to two main application areas, the first being gas turbines and the second being power stations, and useful reference sources are Lefebvre (1989) and Lawn (1988) respectively.

CHAPTER 3 ATOMISATION PROCESSES In spray combustion it is necessary to atomise and distribute the liquid fuel in a controlled manner within the combustion chamber. The performance of the combustion unit is critically dependent upon the drop size produced by the atomiser and the manner in which the combustion air mixes with the droplets. In this chapter the process of atomisation and the means by which it is brought about will be considered. discussion of the mixing processes and the way the A detailed combustion process interacts with the atomisation process are discussed later in Chapter 10.

G. Dantec Electronics and Aerometrics) and this technique produces spatially resolved data on relative number and volume fraction (or size) distributions of the particle, size dependent velocity distribution and relevant statistical quantities. The instrument is similar to a LDA in which crossing laser beams are used to define a probe volume in which interference droplets. fringes cause Doppler signals to be generated by moving 4Ö The technique can be used as an add-on piece of equipment Gmbh) to a conventional LDA system.

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