Download e-book for iPad: Advanced Combustion Science by K. Ohtake (auth.), Professor Tsuneo Someya (eds.)

By K. Ohtake (auth.), Professor Tsuneo Someya (eds.)

ISBN-10: 4431682287

ISBN-13: 9784431682288

ISBN-10: 4431682309

ISBN-13: 9784431682301

Non-uniform combustion, as encountered in diesel and fuel turbine engines, furnaces, and boilers, is chargeable for the conversion of fossil gasoline to power and likewise for the corresponding formation of pollution. despite nice examine efforts long ago, the mechanism of non-uniform combustion has remained much less explored than that of alternative combustion kinds, because it includes many, commonly temporary procedures which impact one another. In view of this heritage, a bunch learn venture, "Exploration of Combustion Mechanism", used to be demonstrated to discover the mechanism of combustion, in particular that of diffusive combustion, and in addition to discover effective how you can keep an eye on the combustion technique for larger usage of gasoline and the relief of pollutant emission. the gang examine used to be began, after preparatory task of two years, in April 1988, for a interval of three years, as a undertaking with a Grant-in-Aid for medical learn of precedence zone backed via the Ministry of schooling, technological know-how and tradition of Japan. the complete team of forty three participants used to be organize as an organizing committee of thirteen individuals, and 5 study teams, such as 36 contributors. The examine teams have been: (1) regular combustion, (2) Unsteady spray combustion, (3) keep an eye on of combustion, (4) Chemistry of combustion, and (5) results of fuels. initially of the venture it used to be agreed that we should always pursue the mechanism of combustion from a systematic perspective, particularly, the objective of the undertaking used to be to acquire the basics, or "know why", instead of "know how" of combustion.

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The laminar flamelet concept can be applied to turbulent diffusion flames as well. However, there have been reported no experimental evidence so far that the flamelet surface exhibit the fractal character. If we can visualize the instantaneous flamelet surface by some simple means, it would be possible to make the fractal analysis of the surface. One possible technique is the laser tomography, which has successfully been applied to the premixed flame. In the technique, some fine solid particles are introduced into a mixture, and a thin laser sheet is passed through the flame to illustrate the seeding particles present in the section cut by the sheet.

Combustion occurs preferentially at those locations in the flow field where mixing is stoichiometric. 12) v' r··. uF where M j is the molecular weight. 13) where v:v /o Mo I V'F MF is the stoichiometric mass ratio. Away from the 2 2 stoichiometric location, the mixture is either fuel lean or fuel rich and therefore leaves either some oxygen or the fuel (which may partially be oxidized to CO and H2) unreacted. Therefore it cannot produce a high enough temperature to maintain a reaction rate, since combustion chemistry is very temperature sensitive.

And the scattering intensity should exactly be proportional to the local particle number density and, the latter should be exactly proportional to the local gas density. In the connection, there is one problem to be considered seriously. When small particles are suspended in a gas with a temperature gradient, they experience a force in the direction down to the gradient [26]. This is called thermophoresis, and there is a possibility that the behavior of seeding particles near the flame front may be affected by this effect, since the front is accompanied by a steep temperature gradient.

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Advanced Combustion Science by K. Ohtake (auth.), Professor Tsuneo Someya (eds.)

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