Investigation of Mach-Number Effects on Roll Moment of Wrap-Around-Fin Projectiles Using Thin-Layer Navier-Stokes Equations

摘要

In this paper, the investigation of Mach-numberrneffects on roll moment of wrap-around-fin projectilesrnis numerically simulated using a multi-zone approachrnand the thin-layer Navier-Stokes equations. Forrncomputation of the three-dimensional supersonicrnturbulent flow, averaged thin-layer Navier-Stokesrnequations in the generalized coordinate system havernbeen solved with an efficient finite-differencernfactored algorithm of the Beam and Warming. Forrnthe turbulent flowfield computations, the well-knownrnisotropic two-layer algebraic eddy viscosity calledrnBaldwin-Lomax model has been used. The case studyrnis a secant-ogive-cylinder configuration with fourrn34° swept wrap-around fins at the end of body. Torndemonstrate the effect of Mach number onrnaerodynamics coefficients, the aerodynamicrncharacteristics of this configuration including axialrnforce and roll moment for free-stream Mach numbersrn1.6-5.0 are presented. In addition, these coefficientsrnare compared with those of the experimentalrnmeasurements at zero angle of attack and the abovernMach numbers, and show good agreement.