Accession Number:

ADA459406

Title:

Ultra High Work, High Efficiency Turbines For UAVs

Descriptive Note:

Final rept. 1 Jan 1997-31 mar 2005

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE

Personal Author(s):

Report Date:

2006-06-01

Pagination or Media Count:

29.0

Abstract:

The opportunity for the reattachment and control of separated flows occurs in inlets, compressors, transition ducts and turbines. Passive and active control of separated flows has been demonstrated successfully by a number of techniques which employ the introduction of longitudinal or streamwise vortices. The role of these vortices is initially to reenergize the wall boundary layer flow by entraining and redistributing momentum from the primary flow to the wall layer and enhance early transition. A chain of non-linear interactions of these unsteady vortices with large scale unsteady separation vortices and the shed shear layer results in significant alteration of the circulation. The resulting increased circulation allows higher blade loadings, reduced part count, and improved performance at low Reynolds numbers.

Subject Categories:

  • Pilotless Aircraft
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE