CAJ | 학술논문

2 nd-order upwind TVD scheme was used to solve the laminar, fully Navier Stokes equations. The numerical simulations were done on the propagation of a shock wave with la 8 ＝ 2 and 4 into a hydrogen and air mixture in a duct and a duct with a rearward step. The results indicate that a swirling vortex may be generated in the lopsided interface behind the moving shock. Meanwhile, the complex shock system is also formed in this shear flow region. A large swirling vortex is produced and the fuel mixing can be enhanced by a shock wave at lov Mach number. But in a duct with a rearward step, the shock almost disappears in hydrogen for Mas = 2. The shock in hydrogen will become strong if Mas is large. Similar to the condition ofa shock moving in a duct full of hydrogen and air, a large vortex can be formed in the shear flow region. The large swirling vortex even gets through the reflected shock and impacts on the lower wall. Then, the distribution of hydrogen behind the rearward step is divided into two regions. The transition from regular reflection to Mach reflection vas observed as well in case Mas = 4 .