A Volume-of-Fluid (VOF) methodology for prediction of Direct Contact Condensation (DCC) of gaseous oxygen jets in subcooled flowing liquid oxygen

A Volume-of-Fluid (VOF) interface capturing method used for modeling Direct Contact Condensation (DCC) of gaseous oxygen in liquid oxygen at the inlet duct to the main LOX pump of India's indigenous semi-cryogenic rocket engine SCE-200. The numerical simulations were performed for 60%, 100% and 105% thrust conditions in 3-D inlet duct geometry with 16 orifices for gas injection, which is an extension of the previous work [1] where 2-D simulations with a single orifice were performed. Lee [2] phase change model has been implemented to predict the condensation effects. The isovolumes of gaseous oxygen volume fraction were plotted at different instants of time to predict the nature and extent of condensation. Further, the variation in amount of gaseous oxygen with time at the exit of the inlet duct estimated to provide design recommendations.