Numerical Prediction of Pitch Damping Stability Derivatives for Finned Projectiles

摘要

The pitch damping dynamic stability derivatives were predicted for two basic finned projectiles using two distinct numerical techniques, namely, the transient planar pitching method and the steady lunar coning method. The dependence of these methods on various aerodynamic and numerical modeling parameters is presented. The accuracy of these methods is also compared to free-flight experimental data for Mach numbers in the range 0.5-4.5. Both numerical methods yielded comparable results, except for some transonic cases for one of the projectiles. Both methods provided poor comparisons with experimental data in the subsonic and low transonic regimes. However, the planar pitching method generally provided a better match with experiment than the coning method across the Mach number range.