Numerical Simulation of Enhanced Mixing in Jet Plumes Using Pulsed Blowing

Abstract

Pulsed jet blowing for mixing enhancement in a hot jet is examined using numerical simulation. Numerical simulations have been completed for a subscale turbojet engine, a full-scale ground demonstration case, and a high-bypass-ratio engine. These simulations have shown that pulsed jet blowing can signie cantly reduce jet plume potential core lengths at static and forward e ight conditions. The numerical scheme uses large time-step implicit integration for efe ciency and a second-order physical space algorithm for robustness. The pulsed jet disturbance is calculated directly, and a turbulence model is employed to represent the cascade to smaller length scales. Experimental data corresponding to the numerical simulations are also presented and indicate similar benee ts from pulsed jet mixing.