Numerical Study Of Richtmyer-Meshkov Instability Of Shock Wave’s Interaction With The Density Of Interface

Richtmyer-Meshkov (RM) instability results when shock wave’s interaction with a liquid orgas will accelerate mixed together between the fluids. It has a significant application on thefields of astrophysics, Inertial confinement fusion (ICF), inertial fusion energy, underwaterexplosion, the space rocket engine fuel mixing and combustion, defense sophisticated weapons.Numerical simulation of RM instability, is an important means of international research on thecurrent instability problems. Based on references of instability experiments, the interactionprocesses shock wave with bubbles and flame are numerically studied and analyzed.Two-dimensional axisymmetric model was established based on ANSYS FLUENT and ICEMas the numerical model in the thesis. Using this model and reference test parameters, thenumerical simulations on the evolution process of at Mach of1.2,1.5and2.0shock wave’sinteraction with diameter of3mm He with SF6gas bubbles and flames. Gives the shock-inducedbubble and flame deformation and development process are carried out, and with the relevantexperimental results were compared to obtain special structural process of the deformation anddevelopment. We got conclusions here: For he bubbles, small mach shock-induced bubblesdeformation process is slow, and the rear will form spike structure. For the late instabilitydevelopment, he bubbles will mainly gather the head and rear of bubble. The big machshock-induced bubbles deformation process is soon, but spike structure is not formed in the rear,he bubbles will mainly gathered in the middle of bubble. For SF6bubbles, the big machshock-induced bubbles deformation process is soon, and will produce shorter jet structure, thedevelopment of instability impact’s is smaller. Small mach shock-induced bubbles deformation isslow, jet and spike structures have a greater impact for instability development. For the earlyinstability development, the larger shock wave mach induced chemical reaction will be faster forthe flame, chemical reaction released heat will accelerate shock wave movement. But for impactof flame deformation, three groups of different shock wave mach induced chemical reactions aresmaller than the shock. In the late, more larger the Mach number, more greater impact for theflame chemical reaction. When the Mach number is greater than a certain value, effects ofchemical reactions on the deformation of the flame will be more than the impact of the shock,thereby making the flame volume becomes larger and larger.