Methods Available at ONERA To Calculate Combustion Chambers.

Presents a survey of calculation methods available at ONERA for combustors. The studies carried out for five or six years were oriented with a view to obtaining several quite detailed calculation methods, concerning each one or several parts of the combustor, rather than an overall modelling; we present successively:-the principle of the decomposition of the combustor into sub-assemblies to which the methods are adapted- the various physical and chemical phenomena concerned, which should be schematized at best to yield a calculation as exact and as general as possible, but also the shortest and least costly- the programmes of two-dimensional, steady calculation, without recirculation, which have been extensively utilized, various examples of use are described- one method of two-dimensional, unsteady calculation with recirculation, recently developed- it is applied here to the study of ignition in a recirculation core. These calculation methods can be used for two purpose: either to allow the design or improvement of a particular zone of the combustor, furnace or burner, or to obtain, by a parametric exploitation, detailed industrial results which could be later introduced into an overall calculation model of an entire, but particular combustor.