Numerical simulation of the effects of pulsed injection on combustion and flow processes in a supersonic combustor

This paper describes two-dimensional numerical simulations of pulsed injection to a hydrogen-fueled air-breathing ramjet using the Reynolds-averaged Navier–Stokes method. We analyze the effects of sinusoidal pulsed injection on the start-up ignition time, start-up ignition range, combustion efficien...

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Bibliographic Details
Published in:Physics of fluids (1994) 2024-10, Vol.36 (10)
Main Authors: He, Zan, Tian, Ye, Le, Jialing
Format: Article
Language:English
Subjects:
Combustion chambers
Combustion efficiency
Equivalence ratio
Hydrogen
Ignition
Ramjet engines
Reynolds averaged Navier-Stokes method
Two dimensional analysis
Two dimensional flow
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Summary:This paper describes two-dimensional numerical simulations of pulsed injection to a hydrogen-fueled air-breathing ramjet using the Reynolds-averaged Navier–Stokes method. We analyze the effects of sinusoidal pulsed injection on the start-up ignition time, start-up ignition range, combustion efficiency, and flow field evolution of the ramjet and compare the performance with that of steady injection. The results show that pulsed injection shortens the ignition time and optimizes the ignition equivalence ratio of hydrogen. Pulsed injection also improves the combustion efficiency of hydrogen, increasing the thrust of the engine by 7.79% compared with steady injection under the same equivalence ratio. We find that pulsed injection can cause oscillations in the ramjet combustion flow field, and show that the oscillation frequency is affected by the pulsed injection frequency.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0234223