Based On The Flight Characteristics And Action Principle Of Microbubble Projectile Research

Modern warfare requires more and more weapons.By improving the traditional uncontrolled projectile,a number of micro-bubble actuators are arranged in the warhead array to realize active flow control,which breaks the flow field around the projectile in the flight process,improves the hydrodynamic characteristics of the projectile,and provides a new option for the research of intelligent ammunition technology.Microbubble actuators using MEMS technology have the characteristics of small size,light weight and low power consumption,which are suitable for the installation and application of shortrange projectiles and aircraft.(1)Considering the external environment during the flight of the projectile,silicone rubber was selected as the thin film material of the microbubble actuator.Theoretical calculation and numerical simulation analysis were carried out on the bulging deformation of the microbubble thin film,and the relationship between the gas input pressure and the deformation displacement of the thin film and the size of the thin film was obtained.The results show that the higher the gas pressure is,the higher the bubble swelling height is.Under the same conditions,the bubble width has the greatest effect on the deformation of the film,and the bubble length has the least effect on the deformation of the film.(2)Based on the theory of boundary conditions and working characteristics of the micro actuators,the choice in low rear wing play head spin annular array fuze parts several actuators,micro bubbles of active flow control in the process of projectile flight,according to the projectile velocity contours and stress under different speed cloud,it is concluded that the micro air bubble actuator air flow on the surface of a projectile are studied.(3)CFD simulation analysis according to existing projectile model,analysis the projectile under the condition of different flight aerodynamic characteristics of projectile,with different size and number of microbubble projectile flight aerodynamic characteristics of the law,obtain the projectile lift coefficient,drag coefficient and pitching moment coefficient with the change of Angle of attack and Mach number,actuator using micro bubbles influence the shells on the surface of the body surface flow can be achieved to increase lift,reduce resistance effect,still can guarantee the stability of the projectile flying at the same time.(4)Build the dynamic model of the microbubble actuator projectile and analyze its dynamic characteristics.Based on the theoretical support of projectile dynamics equations,combined with the aerodynamic characteristics of projectile,the ADAMS dynamics simulation platform was used to conduct flight simulation of the external trajectory of the model of the actuated projectile,and the influence characteristics of the micro-bubble actuator on the external trajectory of projectile were obtained.