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Preliminary studies of autoignition and flashback in a premixing-prevaporizing flame tube using Jet-A fuel at lean equivalence ratiosLean equivalence ratios from 0.3 to 0.7 were observed. Combustor inlet air pressures were varied from 0.54 to 2.5 MPa, combustor inlet air temperatures from 550 to 700 K, and reference velocities from 8 to 35 meters per second. Autoignition delay times ranged from 15 to 100 milliseconds and varied inversely with pressure. The Arrhenius activation energy was 41,840 joules per mole. Temperature rise data were obtained in a long premixing-prevaporizing tube at a pressure of 0.56 MPa. Preflame temperature rise data were a function of equivalence ratio, inlet air temperature, and tube residence time. Significant temperature rise occurred above temperatures of 760 K, with autoignition occurring at 775 K for equivalence ratios greater than 0.47. The reactions were similar to cool-flame phenomena. Flashback velocities were measured at temperatures of 610 and 700 K, pressure of 0.56 MPa, and equivalence ratios from 0.6 to 1. Flashback velocities varied from 30 to 65 meters per second.
Document ID
19770015163
Document Type
Technical Memorandum (TM)
Authors
Marek, C. J. (NASA Lewis Research Center Cleveland, OH, United States)
Papathakos, L. C. (NASA Lewis Research Center Cleveland, OH, United States)
Verbulecz, P. W. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
May 1, 1977
Subject Category
AIRCRAFT PROPULSION AND POWER
Report/Patent Number
E-9039
NASA-TM-X-3526
Funding Number(s)
PROJECT: RTOP 505-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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