Effects of pressure and inlet temperature on coaxial gaseous methaneliquid oxygen turbulent jet flame under transcritical conditions.pdf

J. of Supercritical Fluids 81 (2013) 164–174

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The Journal of Supercritical Fluids

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Effects of pressure and inlet temperature on coaxial gaseous methane/liquid


oxygen turbulent jet flame under transcritical conditions
a a,∗ b

Taehoon Kim , Yongmo Kim , Seong-Ku Kim
a

Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea
b

Combustion Chamber Department, Korea Aerospace Research Institute, 169-84 Gwahak-ro, Yuseong-gu, Daejeon 305-806, Republic of Korea
a
r t a b

i s

c l e i n f o t r a c t



Article history: This study has investigated numerically turbulent flames of cryogenic oxygen and methane under

Received 25 March 2013

supercritical pressures relevant to liquid propellant rocket engines. A real-fluid version of the flamelet

Received in revised form 16 May 2013

equations is employed to modate simultaneously non-equilibrium chemistry of hydrocarbon fuel


Accepted 20 May 2013

and non-ideal thermodynamics in local flame structures while the effect of turbulent fluctuations is

accounted for via a presumed probability density functions. The present model reproduced qualitatively
Keywords:

well the experimentally observed unique feature of a transcritical flame of coaxial gaseous methane/liquid

Real-fluid flamelet model

oxygen injector, which is characterized by sudden flame expansion, abruptly terminated flame tip, and
Transcritical flames

expansion induced flow recirculation. Numerical results reveal that pseudo-boiling phenomena occurred

Effects of chamber pressure

in the transcritical mixing layer between the cryogenic oxygen core and the surrounding hot gas play

Effects of oxidizer temperature

Turbulence–chemistry interaction a crucial role in mixing bustion processes. It is also found that the tr