دانلود کتاب مکاترونیک هوافضا و فناوری کنترل

The drag and heat flux reduction have become an increasing crucial characteristic for the hypersonic vehicles. Numerical simulations of the hypersonic flow around the blunt body with aerospike are investigated for the aerospike’s changing L/D ratios with freedom Mach number of 5.75. The effect of the characteristics of the flow field and the aerospike’s L/D ratios on the drag coefficient of model and the surface pressure coefficient of the nose cone are analysed using a two-dimensional axisymmetric Reynolds-averaged Navier–Stokes (RANS) equations coupled with the two equation k-ω shear stress transport (SST) turbulence model. The numerical simulation results showthat the installation of the aerospike changes the flow field structure of the blunt body vehicle head, which reduces the drag of the blunt body vehicle significantly in hypersonic flight. The size of the recirculation region depends on the aerospike’s L/D ratios. Among the different aerospike configurations studied, the drag reduction effect of aerospike when the L/D = 1 is the best, and the maximum value of the drag reduction efficiency is 36.4%. Within the scope of this study, as the L/D ratio of the aerospike increases, the drag reduction efficiency increases gradually.