Abstract
The impinging twin-jet flowfield is strongly three dimensional as well as turbulent. The k-e two-equation turbulence model and the control-volume integration formula for finite difference and SIMPLEST algorithm are employed to simulate the three-dimensional, isothermal, incompressible f1owfield. The effect of the cross flow, the nozzle-to-nozzle centerline spacing, the nozzle-to-impingement surface spacing and the jet-inlet velocity on the flowfield structure will be studied in this paper. The jets impinge upon the lower plate and create lower wall jets. Some of the wall jets collide with each other and turn upward to form an up-wash fountain which increases the lift force of the upper plate. The fluid surrounding is entrained at the boundaries of the jets which results an induced circulating flow. At some situation, this secondary flow causes the upper plate to have a suck-down force phenomenon.
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