Investigation of the formation and development dynamics of nonisothermal liquid injections in reacting systems

Abstract

Reacting systems involve the interaction between several processes occurring simultaneously over a wide range of time and space scales. The release of chemical energy during combustion generates pressure, temperature, and density gradients, which, in turn, are sources of processes in gases leading to the transfer of mass, momentum, and energy. The strong and ambiguous interaction between the dynamics of liquids and gases and their chemical reactions seriously complicates the experimental study of reacting flows and the creation of any more or less rigorous theory. Therefore, numerical simulation can be successfully used to predict and study the behavior of such complex systems. Experimental observations and approximate theoretical models provide laws that an open physical system must obey. Numerical experiments can be used to verify the fulfillment of these laws. In this paper, computational experiments were carried out on the influence of gas temperature in the combustion chamber on the processes of evaporation, combustion, and dispersion of liquid fuel droplets. As a result of the model experiments, dispersions of liquid fuel droplets along the height of the combustion chamber, the distribution of the temperature plume, and the dependence of the concentration of combustion products on the initial gas temperature were obtained. As a result of the experiments on modeling and studying the features of the implemented heat and mass transfer processes, an effective combustion mode was determined.

Key words: combustion, temperature, evaporation, spray, injector, dispersion, chemical transformation.