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Lean stability augmentation studyAn analytical conceptual design study and an experimental test program were conducted to investigate techniques and develop technology for improving the lean combustion limits of premixing, prevaporizing combustors applicable to gas turbine engine main burners. The use of hot gas pilots, catalyzed flameholder elements, and heat recirculation to augment lean stability limits was considered in the conceptual design study. Tests of flameholders embodying selected concepts were conducted at a pressure of 10 arm and over a range of entrance temperatures simulating conditions to be encountered during stratospheric cruise. The tests were performed using an axisymmetric flametube test rig having a nominal diameter of 10.2 cm. A total of sixteen test configurations were examined in which lean blowout limits, pollutant emission characteristics, and combustor performance were evaluated. The use of a piloted perforated plate flameholder employing a pilot fuel flow rate equivalent to 4 percent of the total fuel flow at a simulated cruise condition resulted in a lean blowout equivalence ratio of less than 0.25 with a design point (T sub zero = 600k, Phi = 0.6) NOx emission index of less than 1.0 g/kg.
Document ID
19790014073
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Mcvey, J. B. (United Technologies Research Center East Hartford, CT, United States)
Kennedy, J. B. (United Technologies Research Center East Hartford, CT, United States)
Date Acquired
September 3, 2013
Publication Date
May 1, 1979
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NASA-CR-159536
UTRC/R79-914104-18
Accession Number
79N22244
Funding Number(s)
PROJECT: RTOP 511-55-02
CONTRACT_GRANT: NAS3-20804
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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