Accession Number : ADA190406

Title :   Investigation of Combustion in Large Vortices.

Descriptive Note : Annual technical rept. Sep 86-Sep 87,

Corporate Author : CALIFORNIA INST OF TECH PASADENA

Personal Author(s) : Marble, Frank E

PDF Url : ADA190406

Report Date : 12 Oct 1987

Pagination or Media Count : 22

Abstract : The investigations of non-steady and unstable combustion in a dump combustor have been completed. The large amplitude driving mechanism centers on the periodic formation and combustion of a large vortex, the phase of heat release being governed by both gas dynamic and chemical delay times. This mechanism is now very well understood, both in principle and in quantitative detail. These results make it a prime candidate for investigations into active control of unstable combustion. The unsteady combustion facility is now being modified to study the details of combustion processes in large vortices utilizing a CID image intensified camera and an LDV for velocity measurements in the hot gas. This study constitutes an essential element in a larger study of shock enhancement for combustion of hydrogen in supersonic burners. Keywords: Unsteady combustion; Vortex burning; Pressure oscillations; Combustion instability.

Descriptors :   *COMBUSTION STABILITY, BURNERS, COMBUSTION, HOT GASES, HYDROGEN, OPTIMIZATION, OSCILLATION, SUPERSONIC CHARACTERISTICS, VARIABLE PRESSURE, VELOCITY, VORTICES, FUEL AIR RATIO, MATHEMATICAL ANALYSIS

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE