Accession Number:

ADA586658

Title:

Dispersion, Mixing, and Combustion in Uniform- and Variable-Density Air-Breathing High-Speed Propulsion Flows

Descriptive Note:

Final performance rept. 15 Jun 2010-14 Jun 2013

Corporate Author:

CALIFORNIA INST OF TECH PASADENA GRADUATE AEROSPACE LABS

Personal Author(s):

Report Date:

2013-08-28

Pagination or Media Count:

28.0

Abstract:

This is a summary of significant accomplishments in investigations on the dispersion, mixing, and combustion in uniform- and variable-density air-breathing high-speed propulsion flows related to scramjet propulsion. In experimental work, progress made in the development of testsection modifications allowed inclined-jet injection in supersonic flow to be studied with and without chemical reactions and heat release. Work on hydrocarbon flames was completed and published, and preliminary investigations on high-pressure effects were conducted. Large-eddy simulations LES were performed on chemically reacting flows in complex geometries, achieving both grid convergence and agreement with experiment. The same computational framework was successfully applied to simulations of inclined-jet injection into a supersonic Mach 3.6 stream. A model for an ethylene-fueled scramjet was developed to facilitate parametric studies of ignition delays in flight-relevant environments. Accomplishments in diagnostic developments enabled many of the experiments and included high framing-rate schlieren digitalimaging technologies, two-dimensional temperature-field measurement technologies, advances in data processing and visualization, and advances in multi-component computer control of experiments.

Subject Categories:

  • Fluid Mechanics
  • Electric and Ion Propulsion
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE