Accession Number:

ADA463272

Title:

Mixing Effects of Pylon-Aided Fuel Injection Located Upstream of a Flameholding Cavity in Supersonic Flow (Postprint)

Descriptive Note:

Conference paper

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS

Report Date:

2005-07-01

Pagination or Media Count:

24.0

Abstract:

An investigation into the non-reacting flow associated with the pylon-aided gaseous fuel injection upstream of a flame holding cavity is described. Characteristics of penetration and mixing were measured in a Mach 2 freestream environment. The downstream combustion cavity had an LID of 4.7 and an aft ramp angle of 22.5 degrees. A circular injection port was placed upstream of the cavity, and a series of three pylons medium, tall, wide geometries were in turn fitted just upstream of the port to examine changes in mixing and penetration of the fuel into the core airflow. The main goals of this experiment were to characterize the mixing ability of injected fuel with the core flow as it propagated downstream of the pylon and to analyze the effects, if any, of this mixing strategy on cavity flow and overall efficiency compared to a no pylon case. Visual measurements were obtained using Planar Laser-Induced Fluorescence PLIF, and Mie scattering techniques. Of the three pylon geometries tested, the wide pylon 1.6 jet diameters wide, 4 diameters high provided a 135 increase in penetration. All pylons lifted the fuel from the injection wall in the farfield a flashback related issue, and all pylons demonstrated distinctive mixing characteristics when compared to the flat reference, although quantifying experiments on this subject are recommended.

Subject Categories:

  • Fluid Mechanics
  • Combustion and Ignition
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE