By Alan Williams
This paintings covers the elemental concept of spray combustion. even if the emphasis is at the basic points, a few business purposes were defined, and the place attainable the textual content is augmented through appendices increasing convinced quantitative points of the ebook. the improvement of spray combustion has successfully separate paths, one curious about engine purposes within which the aerospace functions have ruled the sector, the second one has been fascinated with desk bound gear akin to furnaces and boilers. often, textbooks were serious about one sector or the opposite and the item of this ebook is to stipulate the basics of the combustion of sprays in a unified means that could be utilized to any latest or destiny technological software. over the past decade the need of controlling the emission of toxins has assumed higher 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 will likely be essential to burn fuels that are of low or variable caliber or artificial fuels having homes differing vastly from present-day fuels. For some of these advancements a better figuring out of spray combustion is needed
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Extra info for Combustion of Liquid Fuel Sprays
The problems have been discussed by Dombrowski and Munday (1968), and although a number of empirical expressions have been put forward they are all geometry-dependent and only apply to the system from which they were derived. 58 However performance. empirical expressions can be used to optimise atomiser For example, in recent studies at the CEGB it has been shown that the droplet sizes produced by large capacity power station atomisers employing traditional swirl chamber geometry can be reduced by reducing the size of the swirl chamber and by changing the shape of the front face to prevent droplet-droplet interaction in the spray (Lawn et al, 1986).
10) Thus a plot of in in (1/(1-V^)) against in d yields the value of η from the slope, and D' is the value of d for which Finally it should be noted that = 1/e. 1. Another approach to the problem of size distribution has resulted from the application of a statistical analysis of the breakup of liquids and has led to the logarithmic-normal equation. 12) - Where Μ is the median for the logarithmic-normal distribution and σ is the standard deviation. Whilst this method is useful for a number of applications in spray characterisation it is difficult to apply to spray combustion systems and has not been widely used except in complex computer models.
The spatial distribution, whilst as far as spray combustion is concerned the need is for the temporal distribution, that is the size through a particular plane over a period of time. distribution passing Spatial distributions can be converted to temporal distributions if the velocity of each drop is 38 known. A development of this technique is laser holography but this involves a lengthy analytical procedure. Laser Diffraction Techniques A number of optical and thus non-intrusive techniques were developed in the 1950's which utilised scattering or attenuation of a beam of light passed through the spray.
Combustion of Liquid Fuel Sprays by Alan Williams