Direct numerical simulation of sonic jet in reacting hypersonic crossflow*

At very large Mach numbers, fluid flows are strongly influenced by non-equilibrium gas effects such as finite-rate chemical reactions or internal mode excitation arising from extreme temperatures region. These effects have an order-one influence on quantities of interest, such as stability properties, transition and heating and must be taken into account to achieve effective designs, reliable predictions and successful flow control. 

However, due to challenging flow conditions, most experimental studies are carried out at low temperature to achieve hypersonic speeds and thus remain within the perfect gas regime. Similarly, many simulations have been performed by resorting to simplifying assumptions. There remain, therefore, many open questions regarding the effect of such high-temperatures on the overall behaviour of the flow. In this project, we examine such effects by performing direct numerical simulations of sonic jet injection in a Mach 5 hypersonic crossflow with finite-rate chemistry. The results are then compared to the state-of-the-art modeling approaches (considering perfect gas assumptions) to quantify high temperature effects.