Dynamic features of closed combustion systems

A rational approach to dynamic features of closed combustion systems is of direct relevance to the interpretation of exothermic processes in enclosures, such as the cylinders of piston engines, as objects of control. For this purpose they have to be expressed in terms of non-linear dynamics. The paper presents a method developed in this respect on the basis of the principles of thermostatics and kinetics, supported by heat transfer. The dynamic stage of combustion, manifested by monotonic pressure augmentation, is then carved out of the whole by separating it from the initial stage of ignition and the final stage of decay. Formulated thereupon is an inverse problem: the determination of the dynamic properties of the exothermic process, in terms of the history of fuel consumption, from a measured pressure profile. Particularly instrumental in this respect are: (1) the life function expressing these variables in analytic form, and (2) the correlation, deduced from heat transfer studies, permitting the energy lost by heat transfer to the walls to be evaluated from pressure records. The implementation of the method is illustrated by a diagnosis of the effectiveness with which the exothermic process of combustion is executed in piston engines.

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