在人们的印象中,火箭发动机的喷管是不会变的,从结构上讲它是固定的,这对于大多数中小型火箭发动机来说确实如此。而对于战略弹导弹来说,其发动机的工作范围很宽,从地面点火的零高度到助推段的发动机关机已在高空,工作环境会有很大变化(比如说环境压强变小了),但仍希望它保持较大的推力;其次,受发射设备的限制, In people’s minds, the rocket engine nozzle does not change, it is structurally fixed, which is true for most small and medium sized rocket motors. As for the strategic missile, the engine’s working range is very wide. From the zero altitude of the ground ignition to the engine shutdown of the boosting section, the working environment is greatly changed (for example, the environment pressure becomes smaller) But still hope that it will maintain a greater thrust. Second, due to the limitation of transmitting equipment,