Research On Rocket Gas Jet And Its Environmental Characteristics

Modern rocket weapons have the advantages of a wide range of strikes,high strike accuracy,fierce firepower,effective destruction of targets,and rapid response.The initial shock wave,reflected shock wave,high-temperature and high-speed gas generated during the launch of a rocket have an important impact on the stability of the launching device and the personal safety of the staff.Therefore,the study of the combustion jet launched by the rocket is of great significance.Based on the SST k-? turbulence model of the Reynolds average method,this thesis numerically studies the effects of different launch angles and environmental factors on the external flow fields of the launch tube during the launch of the tilted rocket.The main work of this thesis is as follows:By studying the launch process of rocket gas jet under ideal launch conditions,the formation and evolution of rocket gas jet and its shock wave are obtained.The influence of rocket jet and its shock wave on the ground and the outer wall of launch tube is analyzed and studied.The numerical study of the rocket gas jet at 35°,45°,55° and 65° launch angles reveals the effect of the launch angle on the flow field structure of the rocket gas jet.The results show that due to the inclination of the launch tube,the pressure values in the main vortex ring area on the left and right sides of the launch tube are significantly different.As the launch angle increases,the impact of the jet on the ground becomes stronger,and the temperature in the high-temperature area near the ground becomes higher.The larger the launch angle,the larger the left vortex ring area,and the more high-temperature gas flows to the left.Finally,in combination with actual conditions,the effects of different wind speeds and altitudes on the structure of the rocket's gas jet flow field were numerically studied.Firstly,the structure characteristics of the gas jet flow field when the ambient wind speed is 0m/s,10m/s,20m/s,and 30m/s were analyzed.The main vortex's entrainment effect,but because the wind speed value is far smaller than the jet's expansion speed value,the flow field structure of the jet has a small effect.In addition,the results show that the deflection moment to which the rocket is subjected increases with the wind speed.Subsequently,by analyzing the structure of the gas jet flow field at altitudes of 0m,1500 m,3000m,and 4500 m,it was found that the expansion effect of the jet after exiting the launch tube is stronger because the environmental pressure decreases with increasing altitude,so the impact of the jet on the ground is more significant...