Study on the effect of parameters of spray model on numerical simulations of liquid fuel injection into a supersonic flow

Abstract

A numerical simulation of liquid kerosene injection into a supersonic combustor flow field by the computational fluid dynamics software ANSYS FLUENT was performed The research on the effects of five model constants in K-H/R-T breakup model on the simulation results of spray the penetration height and the dissipation distance was presented The turbulence effects were accounted for by the SST k-? turbulence model The five model constants in K-H/R-T breakup model are B_0 B_1 C_RT C_τ and C_L B_0 and B_1 are the breakup radius constant and the breakup time constant of the K-H model respectively C_RT and C_τ are the breakup radius constant and the breakup time constant of the R-T model and C_L is Levich constant which is the constant of proportionality of the liquid core length The results showed that the influences of all model constants on the penetration height are limited if the constant values exceed certain ranges while the effects of each constant on the dissipation distance are more evident and the ranges of the constant values are more extensive The analysis also revealed that the constants of the K-H model B_0 and B_1 could affect the entire spray area however the constants of the R-T model C_RT and C_τ would mainly dominate the rear part of spray Furthermore the droplet size and the dissipation distance show greater sensitivity to B_0 and B_1 among the five model constants Comparison with experimental data is made in term of the penetration height and the dissipation distance with the aim of obtaining a set of appropriate model constant values The simulation results of the set of model constants showed good agreement with the experimental results

Date of Award	2019
Original language	English
Supervisor	Tsung-Leo Jiang (Supervisor)