Numerical Simulation Of Two-Dimensional Compressible Single-phase And Gas-Solid Two-phase Mixing Layer

The development of a two-dimensional planar gas-phase mixing layer in time and space is simulated numerically, and gas-solid two-phase planar mixing layer flow in time is studied weightily on the basis of this. The two-dimensional compressible unsteady N-S equations are solved by WNND scheme which is three-order accuracy in space.At first, numerical simulation are made on the temporal developing gas-phase mixing layer where the convective mach number( Mc) is in the region of subsonic(0.5) and transonic(0.8). For the temporal problem where Mc is 0.5, researches where the computational field contains different numbers of initial disturbances(so-called n period problem) are made respectively, and vortex's types of evolution in mixing layer including different numbers of initial disturbances are investigated; For the temporal problem where Mc is 0.8, the distinct shock let structure is obtained, and its mechanism is analyzed at the same time. Then, numerical simulation are made on the spatial developing gas-phase supersonic mixing layer where Mc is in the region of subsonic(0.5) and transonic(0.8). For the spatial problem where Mc is 0.5, vortex's types of evolution in space which are like different period problems in temporal developing mixing layer are gained by adding different disturbance frequencies at inlet; For the spatial problem where Mc is 0.8, the spatial developing structure of shock let is obtained.On the basis of the study of gas-phase mixing layer, solid particles are added into the mixing layer and compressible gas-solid two-phase mixing layer flow in time is simulated by using two-way coupling method between flow fields and particles. For the two-phase mixing layer where Mc is 0.5, the interactions between particles and flow field in compressible gas-solid two-phase mixing layer flow are studied about two period problem, and the influence of Stokes number,particle's size,particle's density and particle thickness on the development of flow field and the motion of particles is analyzed. In addition, the influence which is Basset force to the motion of particles is investigated roundly by following a single particle at different initial position. For the two-phase mixing layer where Mc is in the region of transonic(0.8), the influence of particle thickness,particle's size and particle's relative density to gas on shock let structure in flow field is analyzed.