MIXING ENHANCEMENT IN ROUND JET EXHAUST USING PULSED BLOWING: 3-D NUMERICAL SIMULATIONS
The 3-D flow fields of the round jets with pulsed jet blowing for mixing enhancement were simulated numerically,this work uses a technique for injecting high frequency and high intensity signals into subsonic shear layers for the purpose of jet mixing enhancement. In this study, numerical simulations of low Mach 0.23 and high Mach number 0.9 jets exhausting into quiescent fluid are conducted. Three cases are considered respectively in detail: a baseline unforced case and two cases that are forced with flapping modes at Strouhal numbers 0.2 and 0.4.These simulations have shown that pulsed jet blowing at either frequency causes the jet to expand rapidly in the plane parallel with the actuators and to contract in the plane perpendicular to the actuators, the intensity of motion and associated mixing are higher when the excitation Strouhal number is around 0.2, and little injection flow rates can provide tremendous increases in velocity decay rates.
LI Jia-jun Eriqitai
School of Jet Propulsion, Beijing University of Aeronautics & Astronautics, Beijing 100083
国际会议
昆明
英文
591-596
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）