CAJ | 학술논문

利用二阶迎风TVD格式求解多组分、层流全N_S方程.针对直通道和突扩直通道，研究了马赫数为2和4的激波在H2和空气界面上的传播及诱导的燃料剪切混合.计算结果表明：（1）直通道中，剪切层中的激波阵面要发生畸变，存在对混合起主要作用的卷吸涡，激波马赫数不同，卷吸涡结构和横向混合的尺寸也不同.激波马赫数低，剪切混合效果好.（2）在突扩直通道中，马赫数为2和4的激波在H2中产生不同强度激波，在剪切层中都能产生顺时针、尺度较大的卷吸涡，后台阶增强了剪切层的混合.
이용이계영풍TVD격식구해다조분、층류전N_S방정.침대직통도화돌확직통도，연구료마혁수위2화4적격파재H2화공기계면상적전파급유도적연료전절혼합.계산결과표명：（1）직통도중，전절층중적격파진면요발생기변，존재대혼합기주요작용적권흡와，격파마혁수불동，권흡와결구화횡향혼합적척촌야불동.격파마혁수저，전절혼합효과호.（2）재돌확직통도중，마혁수위2화4적격파재H2중산생불동강도격파，재전절층중도능산생순시침、척도교대적권흡와，후태계증강료전절층적혼합.
2nd order upwind TVD scheme was used to solve the laminar, fullyNavier-Stokes equations. The numerical simulations were done on the propagation of a shock wave with MaS＝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 low 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 of a 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 was observed as well in case MaS＝4.