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Numerical Simulation on Circular-Arc Grid-Fin Configurations

A grid fin is an unconventional lifting and control surface which consists of an outer frame with an inner grid of intersecting planar surfaces of small chord. Normal shocks form at the back of the lattice cells at transonic Mach numbers thus choking the flow through the cells and causing a significant reduction in lift force and increase in drag force. An improved circular-arc grid-fin configuration is proposed in the present study to reduce transonic flow choking. Viscous computational fluid dynamic simulations were performed to investigate flows over single baseline and circular-arc grid fins and body-fin configurations under transonic and supersonic flow with Mach numbers in the range of 0.6-4.0. The present numerical results indicate the drag coefficient on single circular-arc grid fin and body-fin configuration is decreased by approximately 10%-24% and 8% respectively for all the Mach numbers investigated in the present study.