Experimental Study of the Behavior of Confined Variable Density Jets in a Time Varying Crossflow

摘要: An experimental work and a physical analysis dedicated to the study of low density jet subjected time varying crossflow with high acceleration/deceleration levels are presented in this paper. Relevant nondimensional numbers derived show that unsteady effects associated presence acceleration field have noticeable consequences on flapping jet. The Schlieren technique is applied test section square duct obtain resolved images Analysis results focused influence global dynamic behaviour near field. interaction between analysed three contrasted situations corresponding different values outlet velocity U0. We predict observe an increase deflection during phase competition drag deceleration. This particularly clear for two lowest ejection velocities we shown initially deflected upstream nozzle. exit injection angle finally considered. or downstream injections induce very strong modification mixing process fluid pulsed crossflow.