Accession Number : AD0728167

Title :   Tunnel Flow Breakdown from Inclined Jets.

Descriptive Note : Aeronautical rept.,

Corporate Author : NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Tyler,R. A. ; Williamson,R. G.

Report Date : MAR 1971

Pagination or Media Count : 52

Abstract : 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 (s/d = 4.3), in transverse and tandem alignment. (Author)

Descriptors :   (*WIND TUNNELS, JET MIXING FLOW), MODEL TESTS, VORTICES, FLOW FIELDS, DOWNWASH, VELOCITY, WIND TUNNEL MODELS, WAKE, BOUNDARY LAYER, TEST METHODS, STATISTICAL ANALYSIS

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE