Обґрунтування вибору форми камери згоряння при застосуванні каталітичного покриття на поверхні поршня

Abstract

The analysis of the existing forms of combustion chambers for diesels with direct injection of fuel with levels of pressure of fuel from 100 MPa to 180 MPa is carried out. The main requirements and peculiarities regarding the influence of the shape of the combustion chamber on the processes of mixture formation, combustion, and the kinetics of the course of chemical reactions during the deposition of a catalytic coating layer on the surface of the combustion chamber of a piston are considered. The most common designs of combustion chamber shapes have been analyzed and reasonable recommendations have been provided to increase the surface area of the chambers to increase the formation of active particles, reduce the energy of fuel activation, accelerate chain reactions, and reduce the heterogeneity of combustion in the near-wall zones. It is advisable to increase the surface area of the chamber in the piston. Variants of constructions of forms of combustion chambers when using a catalytic covering on the surface of the piston which provide a qualitative mixing in case of increase in the surface of the camera for two levels of maximum pressure of injection of fuel have been suggested.