Tunnel Flow Breakdown from Inclined Jets
NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO) OTTAWA
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The document is concerned with surface flow stagnation arising from the deflection upstream of impinging jet flow from circular nozzles directed at an angle to the mainstream. The presence of two clearly defined stagnation regions implies the existence of a stable horseshoe vortex system with corresponding modification of the tunnel flow. Correlation is made for incipient stagnation, providing, at each angle an ultimate limit for vortex formation, i.e, for tunnel flow breakdown. Two additional jet configurations were assessed in a similar manner. These involved a jet-pair sd 4.3, in transverse and tandem alignment.