Accession Number:

ADA537272

Title:

Performance of Pylons Upstream of a Cavity-Based Flameholder in Non-Reacting Supersonic Flow (POSTPRINT)

Descriptive Note:

Conference paper 1 Sep 2005-31 Jul 2006

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Report Date:

2006-07-01

Pagination or Media Count:

22.0

Abstract:

Cavity-based fuel injection and flame holding, typically found in hydrocarbon-fueled scramjet applications, are of current interest for use in supersonic combustors. Both the Air Force Research Lab AFRL and the Air Force Institute of Technology AFIT at Wright- Patterson Air Force Base in Ohio are investigating the enhancement of fuel-air mixing with small pylons that project into the supersonic flow upstream of a flame holder cavity. The pylons were of three sizes medium, tall, and wide and shaped as a thin triangular wedge with a 30-degree inclination angle. The goal was to measure the mixing efficiency and shock loss of each pylon setup for comparison to the baseline condition of transverse injection without pylons. Non-reacting flow was measured using intrusive and non intrusive techniques to obtain pitot pressure, total temperature, cone-static pressure and laser induced Raman spectroscopy to determine species concentration over the cavity downstream of the injection port. Results demonstrated that pylons increase fuel penetration, while not adding significantly to shock losses or overall mixing compared to baseline.

Subject Categories:

  • Lasers and Masers
  • Fluid Mechanics
  • Combustion and Ignition
  • Fuels
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE