Large Eddy Simulation of Flame-Turbulence Interactions in a LOX-CH4 Shear Coaxial Injector
Abstract
This paper deals with the Large-Eddy Simulation of a cryogenic flame issued from a LOX-CH4 shear coaxial injector. The operating pressure is above the critical pressure for both propellants but oxygen is injected below its critical temperature. Such a state is referred to as transcritical and is representative of the extreme conditions which prevail in liquid rocket engines. Transcritical flows also exhibits large variations of density and strong departure from the perfect gas behaviour. To handle this problem, the solver uses a hybrid upwind-central scheme able to capture the sharp density gradients and the real gas thermodynamics is modeled using a cubic equation of state. Finite-rate chemistry is modeled using a modified one step CH4/air mechanism. Then, the filtered reaction rate for each species is closed by correcting the resolved reaction rate with a subgrid turbulent contribution. Two simple forms of this closure have been tested and compared. Qualitative comparisons with experimental data show that the LES is able to capture the turbulent structure of the flame. A dominant diffusion mode of combustion is reported and the flame is observed to be attached to the LOX post.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2012
- Accession Number
- ADA587923
Entities
People
- Matthieu Masquelet
- Nicolas Guezennec
- Suresh Menon
Organizations
- Georgia Tech