EFFECT OF ELASTIC DEFORMATION ON FLIGHT DYNAMICS OF PROJECTILES WITH LARGE SLENDERNESS RATIO

摘要

The elastic deformation of the newly projectiles withlarge slenderness ratio cannot be ignored with the increasingof flight speed and high maneuverability.Reynolds-averaged Navier-Stokes Equations are solvedthrough CFD technique in this paper. Based on theframe of unstructured mesh, techniques of rigid-motionmesh and inverse-distance-weighted morphing meshare adopted to treat the rigid motion of six degree offreedom(SDOF) caused by flight dynamics and flexiblestructure deformation caused by aeroelasticity respectively.Moreover, the six-degree freedom dynamicequations are solved with static aeroelastic equationswith the mode-summation method. Numerical results offree flight case and static aeroelasticity case calculatedusing the in-house code both agree well with the experimentaldata respectively, which shows the validationof the numerical method. An air-to-air projectile modelof X-X configuration is constructed to research theeffect of elastic deformation on the trajectory of theprojectiles with large slenderness ratio. Comparisonresults of flexible and rigid models show that the longitudinaland course trajectory of centroid is affected bythe elastic deformation, and the oscillatory cycle of theorientation angle increases. Furthermore, the trajectoriesof rigid models with various centroid locations arecomputed, illustrating that the elastic deformationcould move the aerodynamic center forward and weakenthe margin of the stability.