Numerical Investigation of Aerodynamic Performance of Planar/grid Stabilizer wings at Downstream Control Surface in Transonic Flow Regime

In multi-stage missiles, stabilizer wings are responsible for stabilizing the missile. The control fins located upstream of the stabilizer wings affect the flow by spinning, which influences stability and control. One method for resolving this problem is to design stabilizer wings with less affectability against the upstream flow. The present paper deals with this issue by considering multiple planar and grid fins. The appropriate missile model is established Once validation is performed and the appropriate turbulence model and the planar and grid fins are chosen. Then, on a model with speeds of 0.6, 0.7, and 0.8 Mach, at attack angles of 0, 2, 4, and 6 degrees, and with control fins, variation at angles of 0, 1, 3, and 6 degrees, the aerodynamic coefficients, as well as the effects of the upstream stabilizer wings, are investigated in pitch and roll modes at an appropriate trim angle. The obtained results indicated that the grid fin downstream of the control surfaces would be less affected due to its physical nature. Thus, the lower capacity of the control surface would be used for control during the flight, which would significantly facilitate the process of designing.