Observations of Tunnel Flow Separation Induced by an Impinging Jet,
Abstract
Single jets were directed towards, and perpendicular to, the boundary of the 10-ft x 20-ft test section of the NRC V/STOL Propulsion Tunnel. The position of tunnel flow separation, arising from jet impingement and forward penetration, was determined from wool tuft observations for various conditions of jet geometry, jet velocity, and tunnel speed, relevant to V/STOL models involving discrete jets. The results indicated the separation position, relative to the jet nozzle, to be a simple function of the product of effective mainstream/jet velocity ratio and nozzle height/diameter ratio. A value of this product greater than 1.5 was found to be necessary to ensure tunnel flow separation downstream of the jet nozzle. An approximate extension to inclined jets, based on limited test data, is included. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1970
- Accession Number
- AD0714938
Entities
People
- R. A. Tyler
- R. G. Williamson
Organizations
- National Research Council Canada