Analyses for turbojet thrust augmentation with fuel-rich afterburning of hydrogen, diborane, and hydrazine Page: 2 of 22
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DECLASSIFIED- US: 1688
Ak;1t-TATNE TO ROBERTSON MEMO
.. .. . . ..DA.T.ED 9/28/66
NACA RM E57D22: :" . oo0.
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
RESEARCH MEMORANDUMDeclassified by authority of NASA
-iassification Change Notices No. _
Dated ** - aI ---
ANALYSES FOR TURBOJET THRUST AUGMENTATION WITH FUEL-RICH
AFTERBURNING OF HYDROGEN, DIBORANE, AND HYDRAZINE
By James F. Morris
Turbojet-engine net thrusts augmented with fuel-rich afterburning
during takeoff and flight were computed. When compared at equal liquid
weights, hydrogen, diborane, or hydrazine, burned at higher than stoichi-
ometric fuel-air ratios, can produce thrusts that are, to some limit,
greater than those for a 220-second specific-impulse rocket combined with
stoichiometric afterburning of the turbojet fuel. At the conditions
analyzed, this limit for liquid hydrogen is a liquid-air ratio of 0.16;
the corresponding thrust is 27 percent greater than that for stoichiometric
Fuel-rich afterburning of 7000 K hydrogen can yield augmented thrusts
greater than those for stoichiometric combustion of 7000 K hydrogen and
4000 K air augmented with a 321.6-second specific-impulse rocket.
Turbojet-propelled aircraft can take off with heavier loads and fly
at higher speeds if thrust is augmented. Afterburners and rockets are
often used for this purpose. Afterburning is generally limited to near-
stoichiometric fuel-air ratios because hydrocarbon-rich combustion offers
only slight thrust gains. However, rich afterburning may be practical
with some of the fuels being considered for future aircraft use. Hydrogen
and diborane are among the fuels that can increase flight range and
altitude. Rich combustion of these fuels may produce high values of
If fuel-rich afterburning is effective, it will be a simple method
for increasing turbojet-engine thrust. Rich combustion should require,
at most, a second afterburner fuel system and an exhaust nozzle capable
of larger area changes.
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Morris, J. F. Analyses for turbojet thrust augmentation with fuel-rich afterburning of hydrogen, diborane, and hydrazine, report, June 18, 1957; (digital.library.unt.edu/ark:/67531/metadc53092/m1/2/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.