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Промышленность. Энергетика Промышленность. Энергетика
Химическая и лесная промышленность Химическая и лесная промышленность


A Numerical Investigation for the Prediction of the Stability Limits of Combustion Systems LES of the Pulsating, Non-Reacting Flow in Combustion Chambers.

Автор:   Balazs P.
мягкая обложка
116 страниц
2009 год
Издательство:   Книга по Требованию
2359 руб
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Описание:In the present work a numerical investigation of the pulsating, non-reacting flow in a model combustion chamber and a coupled system of burner plenum and combustion chamber is presented. It depends, however, on special boundary conditions. The prediction of the damping ratio by LES is very good. An analytical model was developed by Buechner [14] in order to predict the stability limits of combustion systems. The pulsating flow in the region of the exhaust gas pipe was analyzed and compared with the literature. The major damping mechanisms were identified in the system and a source of combustion instabilities could be localized. A significant input of this model is the damping ratio, which should be determined from experiment or numerical simulation. By means of the simulations the basic assumptions made by the analytical model could be confirmed. The results of the Large Eddy Simulations (LES) are compared with the analytical model and experimental data. The lean premixed combustion allows for reducing the production of thermal NOx, therefore it is largely used in industrial combustion. Lean premixed combustors are, however, prone to combustion instabilities.

Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

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The history of Rome. Book IV

But, when a vessel is emptying itself by constant efflux, the evil is to be remedied not by pouring in even considerable quantities, but only by the establishment of a constant influx - a remedy which was on various occasions attempted, but not with success. In the provinces, not even the smallest effort was made to save the farmer class there from being bought out by the Roman speculators; the provincials, forsooth, were merely men, and not a party. The consequence was, that even the rents of the soil beyond Italy flowed more and more to Rome. Moreover the plantation-system, which about the middle of this epoch had already gained the ascendant even in particular districts of Italy, such as Etruria, had, through the co-operation of an energetic and methodical management and abundant pecuniary resources, attained to a state of high prosperity after its kind. The production of Italian wine in particular, which was artificially promoted partly by the opening of forced markets in a portion of the provinces, partly by the prohibition of foreign wines in Italy as expressed for instance in the sumptuary law of 593, attained very considerable results: the Aminean and Falernian wine began to be named by the side of the Thasian and Chian, and the "Opimian wine" of 633, the Roman vintage "Eleven", was long remembered after the last jar was exhausted ...»

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