The Linearization Method to Calculate the Equilibrium Composition of Combustion Products of Diesel Engine

Abstract

AbstractDuring the operation of locomotive power plants, a large number of various toxic substances are released into the environment with the products of fuel combustion, the concentration of which depends on numerous factors. The control and limitation of toxic pollution are regulated by the norms and methods established in railway transport, which are based on instrumental methods. In addition to instrumental methods, calculation methods for determining the composition of exhaust gases, for example, equilibrium, are becoming more widespread. To solve a complex nonlinear system of equations of equilibrium, material balance and Dalton, a linearization method is proposed by taking logarithms to calculate the equilibrium composition, taking into account the nature of heat release during fuel combustion in the cylinders of a diesel locomotive engine. The values of the partial pressures of the components of the combustion products of the fuel obtained as a result of solving the system of equations make it possible to determine the mass fractions at constantly changing values of the pressure and temperature of the working heat, taking into account the characteristics of heat release throughout the process of fuel combustion in the diesel cylinder. Some results of modeling the formation of fuel combustion products for diesel locomotive 2A-5D49 of diesel locomotives TEP70BS for the nominal operating mode are presented, which confirm the possibility of using the proposed method of equilibrium composition and ways of its implementation to assess the efficiency of an autonomous locomotive both in terms of fuel efficiency and environmental safety.KeywordsDiesel engineCombustion productsEquilibrium compositionNonlinear equation systemLinearization