Skewness effects on the turbulence structure in a high-speed compressible and multi-component inert mixing layers

This work presents the analysis of the effects of the misalignment angle between two asymptotic streams of fluid, $\zeta$, whose interaction leads to a turbulent mixing region. In fact, spatially evolving mixing layers may see their turbulent structure statistics altered in the presence of the skew angle $\zeta$. The investigation is conducted by analyzing a new set of direct numerical simulations of spatially-developing compressible non-reactive hydrogen--air shear layers. To assess the effects associated to misalignment angle, the turbulent structure statistics of a skewed configuration with $\zeta=15^{\circ}$ are compared to the reference case where no skewness is introduced. The analysis of the mixing layer time-averaged statistics reveals the ability of the skewness to accelerate the inlet structures growth which, consequently, yields to a substantial enhancement of the mixing efficiency.