Experimental Studies of Inverted-Profile Coaxial Jet Flows

A getieric single coaxial jet model uias designed. constructed. and tested in a water tunnel specially designed for STOVL (Short Take Off and Vertical Landing Aircraft) flow applications. Laser Doppler Anemometry (LDA) surveys and Laser Induced Florescence (LIF) image capture were used to visualize the global flow. patterns and identify the mean velocity and turbulence structure of an incerted-projilc coaxial impinging jet. with and withoiut a crossflow Effects of the outer/inner jet velocity ratio and uertical jet/ horizontal crossjioui velocity ratio on the development of the coaxial jet flow field uiere studied. The results 000presented are suitable for CFD validation purposes.