The Investigation of the Safe and Unsafe Cargo Release from Su-22

The cargoes in a fighter aircraft should be released in such a way so as not to hit the fuselage, but to hit the targets accurately. In order to identify and eliminate the mentioned problems and achieve the optimal conditions, the computational fluid dynamics (CFD) plays an important role. In this study, the trajectory of the projectile and its angular variations have been investigated such that in the process of the simulation, one of the wings of the Su-22 aircraft with a NACA-64a210 delta-shaped cross-section, along with the pylon, a rectangular plate with two elliptical sides and a cargo with NACA-0008 cross-section with delta-shaped blades have been considered. The study has been carried out for different flight conditions, including three altitudes of 5, 10, and 12 km above the ground, various Mach numbers of 0.5, 0.8, and 1.2, different attack angles (AOA) of 0, 2, 4, and 8 degrees and lateral wind with speeds of 0, 40, and 60 m/s. The purpose of this study is to model and investigate the safe and unsafe release of cargo by the wings of Sukhoi-22 aircraft in a different flight package. This is done in order to find carefully the physical releasing conditions in turbulent compressible flows. Finally, by examining the results, the effect of each of the parameters of flight altitude change, Mach, angle of attack, and lateral wind speed on the projectile movement path in the release conditions without initial force is assessed, to identify all safe and unsafe releases.