Numerical Analysis of Specific Features of Droplet Breaking and Evaporation in Gas Dynamic Flow with Cyclic Shock Waves

A High-enthalpy flow generators (HEFG) have a wide range of applications in modern power systems, aircraft engines and technological installations. In a number of HEFGs the fuel mixture consists of liquid fuel and gaseous oxidizer. The study of the existing literature shows that the problem of developing a non-electric, reliable and environmentally friendly system of initiating working process in a HEFG is considered a key challenge. To solve the problem, a gas dynamic ignition system (GIS) is proposed, where the fuel is supplied in the liquid phase state, and the oxidizer in the gaseous state. The existing methods of the liquid phase ignition in the oxidizing environment on the resonator outer surface are not effective; they have long ignition time delays and limited applications. It warrants the development of a GIS with volume ignition of droplet aerosol of liquid fuel in the gaseous oxidizer inside the resonant cavity. To solve the specified problem, a series of investigations involving the study of fuel mixing and macro kinetic processes in GIS are required. The article presents a mathematical model and results of the numerical simulation of specific features of non-stationary gas dynamic flow as well as droplet breaking and evaporation processes in the GIS passage. The results obtained can be used when designing gas dynamic ignition systems for HEFGs.

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