Numerical Simulation Of Complicated Spinning-Lateral Jet Flowfield

Three dimensional interaction flowfield over high-speed spinning projectile with lateral jets is numerically simulated in this dissertation firstly. Complicated shocks wave patterns is analyzed. Several factors concerned such as high-speed spinning, attack angle, base bleed and so on, are studied. The aerodynamics characteristic of spinning projectile with lateral jets is analyzed detailedly.In rotating frame of reference, the construction method of three dimensional finite volume TVD schemes is systemically analyzed, in which implicit Euler defiference is applied for time discretization. The high Reynolds number two-equation k- E turbulence model is used. The dual-time stepping method proposed by A.Jameson is applied to improve time precision for unsteady flowfield computation. The three dimensional grid for projectile with lateral jets, especially body-fitted for lateral jets exit, is generated by improved traditional methods with projection and zonal method.The flowfield over low-drag and long-range projectile with small attack angle is numerically studied from transonic to supersonic velocity. It provides basic work for aerodynamics characteristic of this projectile and for lateral jet interaction flowfield, and it shows this projectile can decrease drag. Zonal method is tried to compute flow over projectiles and results is satisfied, but computation is much slower.Without spinning or attack angle, the three dimensional interaction flowfield over projectile with lateral jets is numerically simulated successfully, and unified interaction flowfield with lateral jets and base bleed is also calculated. The flow field that results from the interaction of lateral jets injection into supersonic flow over projectile has complicated shocks wave patterns, which include regions of shocks and expand waves, and the lateral jet interaction also effects base flow of projectile. The ratio of Mach number between lateral jet and free flow induce intensity degree of jet interaction. It has no obvious difference between two interactions with two types of nozzle exit configuration, rectangle and ellipse. The shock in front of jet results in increase of shock resistance and the jet ejection causes increase of base resistance. The base bleed has two contrary action of providing energy and ejection, and it can weaken the effect of lateral jet upon base flow.The interaction flow field over high-speed spinning projectile with lateral jets is simulated secondly. Comparison with nonspinning case shows spinning changes the flow structure and base flow of projectile with lateral jets. The lateral jets are caused to inclineto the direction of rotating free flow and to weaken the effect upon base flow. Furthermore, the spinning effect upon lateral jet is much stronger than that upon base bleed.With attack angle, two types of unsteady flowfield over high-speed spinning projectile without and with lateral jets are successfully simulated respectively by dual-time stepping method. The two results of flowfield show unsteady and periodically after one period of spinning. The pressure of projectiles without lateral jets waves periodically and the Magnus force coefficient is in excellent agreement with the experiment data. In the result with lateral jets, the structure of jets, the pressure of projectile surface and the aerodynamics characteristics are all in steady periodical fluctuation.The complicated aerodynamics characteristic of spinning projectile with lateral jets and with attack angle is studied detailedly. The formation and changes are analyzed including Magnus force, normal force, yawing moment, pitching moment and pressure center. The aerodynamics characteristic of spinning projectile with lateral jets has constitutionally difference in formation from that without jet, and it waves periodically. These characteristics are very important for the study of aerodynamics of projectile with lateral jets.