基于粒子法的可变边界柔性气缸弹射研究

In order to solve the problems of obvious infrared characteristic,unstable energy and complex structure of the existing ejector,and further improve the ejection efficiency and stability,a flexible cylinder ejector was proposed, that can independently increase the cylinder boundary based on the existing compressed air ejector, so as to realize the long-distance work of high-pressure gas under the constraint of flexible cylinder. On the basis of explicit dynamics,the finite element model of large-scale flexible cylinder ejection load under multiple working conditions was established,and the fluid-solid coupling numerical simulation of large-scale flexible structure ejection load based on particle method model was realized. The results show that when the inflation rate is constant, the velocity of flexible cylinder ejection is 11.7% higher than that of compressed air ejection, and the maximum overload of missile is reduced by 71. 6% . Further research shows that the main influencing factors of air leakage of the same fabric are the pressure difference between inside and outside. In order to study the air leakage of different materials, three materials were selected, among which cotton 66C is the best ejection index of ejection system of flexible cylinder fabric. The lower the ambient pressure is,the higher the ejection kinetic energy is. Under 70 kPa ambient pressure, the kinetic energy increases by 15. 8% compared with the standard atmospheric pressure.