Three-dimensional Reynolds-averaged Navier-Stokes simulations have been performed to explore the aerodynamic characteristics of ramjet projectiles. The turbulence model used is the RNG k-ε model. The numerical algorithms termed total variational diminishing (TVD) was adopted. The complex wave structures of ramjet projectiles with different architecture at different inflow Mach number were achieved by numerical simulation. The influence of inflow Mach number on aerodynamic characteristics and pressure center of ramjet projectiles were analyzed. Results show that lift coefficient and pressure center increase with the argument of inflow Mach number. Ramjet projectiles with different architecture have different drag coefficient trend.
Composite foam sandwich tube, which is a sandwich structure, improves stability of the tube and strength for use compared with single-layer composite, and is available in civil engineering as bearing member of light weight, high strength, and corrosion resistance. Axial compression experiment was made for fiber reinforced resin matrix composite foam sandwich tube which is laid in 5 different ways, and the comparing analysis on damage models was made according to experimental phenomenon. The laws of influence is preliminarily recognized by analyzing influence to foam sandwich tube of fiber laying, modulus of fiber, three dimensional elastic modulus ratio, tube radius, tube thickness.
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