Article number2009-4038- Future launchers will use rocket propulsion systems burning CH4/LOx at supercritical conditions. Despite this new trend there are a lack in experimental data and numerical studies in literature using methane-oxygen combustion at these extreme conditions. Until now, only H2/LOx injection and combustion has been investigated deeply. The aim of this investigation is the numerical study of the CH4/LOx injection, mixing and combustion in liquid rocket engines with shear coaxial injectors, at supercritical conditions. A theoretical study on the great importance to account real gas effect at these conditions has been done. Properties as isobaric specific heat and density have been calculated using different equations of state, and they have been compared with ideal gas and NIST data. CFD simulations have been also performed by using different approaches: the Soave Redlich-Kwong real gas model has been implemented to model the physical properties of the species in the single step methane/oxygen reacting mixture. An E.D.M. model describes the turbulence-chemical kinetics coupling. The use of real gas equation of state is computational expensive so simulations have been also performed by the implementation of NIST data at 15MPa in the material database. The two approaches have been compared positively. The effect of activating LES model in cold flow simulations has been investigated.
Cfd Simulation Of Mixing And Combustion In Lox/Ch4 Spray Under Supercritical Conditions
DE GIORGI, Maria Grazia;
2009-01-01
Abstract
Article number2009-4038- Future launchers will use rocket propulsion systems burning CH4/LOx at supercritical conditions. Despite this new trend there are a lack in experimental data and numerical studies in literature using methane-oxygen combustion at these extreme conditions. Until now, only H2/LOx injection and combustion has been investigated deeply. The aim of this investigation is the numerical study of the CH4/LOx injection, mixing and combustion in liquid rocket engines with shear coaxial injectors, at supercritical conditions. A theoretical study on the great importance to account real gas effect at these conditions has been done. Properties as isobaric specific heat and density have been calculated using different equations of state, and they have been compared with ideal gas and NIST data. CFD simulations have been also performed by using different approaches: the Soave Redlich-Kwong real gas model has been implemented to model the physical properties of the species in the single step methane/oxygen reacting mixture. An E.D.M. model describes the turbulence-chemical kinetics coupling. The use of real gas equation of state is computational expensive so simulations have been also performed by the implementation of NIST data at 15MPa in the material database. The two approaches have been compared positively. The effect of activating LES model in cold flow simulations has been investigated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
