The influence of the twist of an active-reactive type penetrator on the depth of its penetration into the soil

The objective of this work is the computational and experimental assessment of the effect of twisting an active-reactive type projectile-piercer around its own axis on the parameters of its motion and the depth of penetration into the soil. Research methods: the equations of motion of a rotating activereactive type projectile-piercer (SPART) are considered. The features of determining the engine thrust, rotating SPART and the resistance force during penetration of SPART into the soil with rotation are analyzed. A comparative analysis of the penetration depths of rotating and non-rotating SPART into loam is carried out. As a result of the studies, a mathematical model of the process of penetration of an activereactive type projectile-piercer into the soil is developed. The effect of SPART rotation around its own axis of symmetry on the performance of the propulsion system is shown. The effect of contact friction forces between the rotating SPART and the soil on the parameters of its motion and the depth of penetration is assessed. Calculations show that by spinning the SPART around its own axis of symmetry, the depth of penetration of rotating active-reactive type punching projectiles into the soil can be increased by 8–10 %. Conclusion: the results presented in the article can be useful for researchers, postgraduate students and engineers involved in the creation and operation of aviation and rocket and space technology, and can also be useful for students of technical universities studying in the relevant specialties.