Numerical simulation of enhanced mixing in jet plumes using pulsed blowing

Pulsed jet blowing for mixing enhancement in a hot jet is examined using nu merical simulation. Numerical simulations have been completed for a subscal e turbojet engine, a full-scale ground demonstration case, and a high-bpass -ratio engine. These simulations have shown that pulsed jet blowing can sig nificantly reduce jet plume potential core lengths at static and forward Ri ght conditions. The numerical scheme uses large time-step implicit integrat ion for efficiency and a second-order physical space algorithm for robustne ss. The pulsed jet disturbance is calculated directly, and a turbulence mod el is employed to represent the cascade to smaller length scales. Experimen tal data corresponding to the numerical simulations are also presented and indicate similar benefits from pulsed jet mixing.