论文部分内容阅读
低温推进系统要遇到地面试验、第一次燃烧和轨道滑行后再次起动等多种发动机的起动环境。这些工作方式要求发动机与级必须良好的协调配合,尤其是对推进剂输送系统及发动机各分系统的热量控制。影响推进剂输送系统工作条件的范围极广泛,括括静态试验,第一次点火及轨道再次起动时的各种热负荷和加速度力等。为了保证泵的净正吸程和维持涡轮泵的热量控制,目前使用一种在发动机起动以前,就使推进剂通过输送系统的方法来实现热量控制。由此所带来的设计及工作准则就与级和运载火箭紧密相关了,例如:包括辅助推进以及象推进剂贮箱在推进泄放中使推进剂下沉的方法。对发动机的热敏感部件要采取环境控制,环境保护或专门的程序,以保证发动机的多次起动性能。一个例子是,为避免泵在快速瞬态起动时失速,对推力室要进行预冷。今后发动机的发展方向是趋向于扩大系统的适应性。也就是在没有专门的预起动调节的情况下,就能适应广泛多变的环境。
Low-temperature propulsion system to encounter the ground test, the first combustion and orbital re-starting after a taxi and a variety of engine starting environment. These methods of work require good coordination between the engine and the stage, especially for the thermal control of the propellant delivery system and the engine subsystems. A wide range of operating conditions affect the propellant delivery system, including static tests, the first ignition and orbital re-start of a variety of thermal load and acceleration force. In order to ensure net positive suction of the pump and to maintain the heat control of the turbo pump, a method of controlling the flow of propellant through the delivery system is used to control the heat before starting the engine. The resulting design and operating guidelines are closely related to the stage and launch vehicle, for example, including assistive propulsion and methods of sinking propellants as propellant tanks in propulsion. The engine heat-sensitive components to take environmental control, environmental protection or special procedures to ensure that the engine starting performance. One example is to pre-cool the thrust chamber to avoid stalling of the pump during fast transient starts. The future direction of development of the engine tends to expand the system adaptability. That is, without special pre-start adjustment, it can adapt to a wide range of changing environment.