Near wall recombination eects on the prediction of heat flux in O2/CH4 combustion chambers

Dealing with oxygen/methane thrust chambers, in case of extremely cooled walls, the near wall recombination plays a non-negligible role in predicting the wall heat transfer from the hot gas to the wall. Referring to the ISP1 oxygen/methane thrust chamber test case, the numerical solution obtained under the frozen flow assumption is compared to that of reacting flow taking into account the recombination of dissociated species. Comparing the numerical solution obtained by means of simplified and global kinetic mechanisms, the results show that the global Jones-Lindstedt kinetic mechanism is able to catch the recombination heat increase but, if boundary layer details are needed, the simplified mechanism must be taken into account.