Experimental investigation of opposed rectangular impinging jets confined in an open cavity with vertical crossflow in a rectangular duct

摘要: Abstract An experimental investigation is carried out using stereoscopic time-resolved particle image velocimetry (TR-PIV) to study the dynamics of flow structure two turbulent planar water jets impinging normally against each other inside an open cubical cavity subjected external lateral flow. The depth equal channel and both crossflow are kept at ambient temperature T 0 . three-dimensional near field development has been investigated for fixed nozzle separation Reynolds number defined with hydraulic diameter 3000 three jets’ numbers based on inlet velocities ranging from 1500 5000. In this arrangement, jet impingement moves off center, fields asymmetric respect mid-span exhibit self-sustained oscillations a pronounced flapping motion. Based measured data in planes normal floor, mean instantaneous velocity vorticity distributions statistics have analyzed characterized. addition, spectral analysis oscillating instability performed analyze effects confinement boundaries interactions between spatio-temporal oscillatory motion vortex structures.