Resonant Jets for Turbine Cooling
Abstract
The objective of this investigation is to enhance the effectiveness of jet-impingement cooling, used in the hot turbine sections of jet aircraft engines, by exploiting the recently recognized capacity of the large-scale structures to alter the total temperature of jets. In this report, the results obtained from a newly constructed air-jet facility and from a water-jet test rig built separately for flow visualization study are described. In each, a jet discharged from a circular nozzle impinges on a plate. The results appear to substantiate the following speculations previously advanced: The secondary vortices, which are induced by the bombardment of the primary vortices formed initially by the nozzle exhaust, are responsible for the cooling on the impingement surface. The degree of cooling is, however, significantly affected by the competition between the primary and secondary vortices and the occurrence of acoustic resonance. The effect of the curvature of the impingement plate and the jet Mach number is also described.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 25, 1991
- Accession Number
- ADA236755
Entities
People
- M. Kurosaka
Organizations
- University of Washington