A numerical study of high-pressure oxygen/methane mixing and combustion of a shear coaxial injector

Nan Zong, Vigor Yang

Research output: Contribution to conferencePaperpeer-review

9 Citations (Scopus)

Abstract

The mixing and combustion of cryogenic oxygen and methane in a shear coaxial injector operating under supercritical pressures are investigated numerically. The formulation accommodates full conservation laws and real-fluid thermodynamics and transport phenomena. The near-field fluid injection and mixing dynamics are characterized by the evolution of two mixing layers. The vigorous fluctuations generated from the inner mixing layer, which consists a string of large scale vortices emerging from the LOX post tip, provide a forcing on the outer shear layer. The formations of large structures do not follow the fundamental Kelvin-Helmholtz instability mechanism, but in a manner analogous to that produced at a backward-facing step. The effect of the momentum-flux ratio on the flow evolution is demonstrated. As the velocity of the methane stream increases, turbulent mixing is enhanced, and both the inner and outer potential cores are reduced. A diffusion dominated combustion occurs in the presence of large gradient of fluid properties. The work also identifies the flame anchoring mechanism.

Original languageEnglish
Pages11521-11535
Number of pages15
Publication statusPublished - 2005
Event43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: 2005 Jan 102005 Jan 13

Other

Other43rd AIAA Aerospace Sciences Meeting and Exhibit
CountryUnited States
CityReno, NV
Period05-01-1005-01-13

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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