Nikhil Jain, Mahavir Choudhary
Abstract: This paper revisits the literature pertinent to droplet combustion studies for liquid monopropellants as well as practical applications of monopropellants in internal combustion engines. A review is presented on the scope and different applications of the concept of droplet combustion in various applications, such as diesel engines, rocket engines, gas turbines, oil fired boilers, and furnaces etc. Our major objective is the numerical analysis of monopropellants droplet combustion. Combustion of a single monopropellant droplet in an oxidizing and a non-oxidizing atmosphere was studied in order to understand the basic mechanism by which combustion occurs in such systems. In this study a semi empirical model for hybrid combustion of hydrazine was implemented in order to extract the mass burning rate for hybrid combustion. Additionally, the temperatures and diameters of various flames were determined. The detailed theoretical studies characterizing the combustion of monopropellant blends in the form of droplets have been reported. At different droplet diameter and ambient oxygen mass fraction, both experimental and predicted mass burning rate were found to be similar. Also flame diameter and temperature were found to be of increasing nature with increase in droplet diameter and oxygen mass fraction.
Keywords: Monopropellant, Combustion, Droplet, Flame