In this paper the influence of various parameters of the primary and secondary zones of a small-sized combustion chamber on its environmental characteristics was studied. The study of the environmental characteristics of the combustion chamber was carried out in two ways. The first method consisted of two steps. The first step was a 3D simulation of combustion processes using FGM combustion model. The second step was based on results of the first step using reactors network implemented in the ANSYS Fluent 18.2 software. The construction of the reactors network in this approach occurred automatically according to a temperature and mixture fraction. The number of reactors in the result was about 500. The second method was a simple model of a reactors network in which the primary zone was simulated by a perfectly stirred reactor, and the secondary zone was a plug flow reactor. Methane was used as a fuel. The influence of the residence time of the mixture and fuel-air equivalence ratio in each zone on the emission of CO and NOx at the combustion chamber exit was studied. The residence time and fuel-air equivalence ratio for the first method were changed using the design parameters of the combustion chamber. For a simple reactors network, these parameters are set as input data, so this method can be used at the preliminary design stage. As a result of the work, a method was obtained that allows to find the parameters of the primary and secondary zones of the combustion chamber in order to minimize pollutant emissions at the preliminary design stage.
The object of the study is a straight-flow annular combustion chamber (CC) with toroidal recirculation-mixing zone which has significant reserves of minimization in size. The workflow of the CC has a number of problems, which arise due to the lack of experimental and calculated data. The aim of the study is to refine the design of the CC with toroidal recirculation-mixing to obtain the necessary workflow parameters. The first step of maturation involved the organization of swirl structure at primary zone. On the second step there were conducted the refining of the flame shape in primary combustion zone. The third step was devoted to the formation of the necessary temperature field at the outlet of the CC. As a result, an acceptable design of the combustion chamber was obtained.
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