大推力液氧煤油补燃发动机分级起动仿真分析
Simulation analysis of staged startup of large thrust LOX/kerosene staged combustion rocket engine
张睿文 1李斌 2王丹 2张晓光1
作者信息
- 1. 中国航天科技集团有限公司西安航天动力研究所,西安 710100
- 2. 中国航天科技集团有限公司航天推进技术研究院,西安 710100
- 折叠
摘要
分级起动是提高大推力液氧煤油补燃发动机起动品质和发射可靠性的重要措施.通过系统动力学仿真,分析了发动机分级起动特性.采用Modelica语言开发了通用模块化液体动力系统动态特性仿真模型库(Tulips).基于模型库,自底向上逐层构建和验证了发动机系统仿真模型.仿真结果表明:初级工况设置在推力高于额定值40％时起动品质较好;初级工况越低,进入初级工况的延迟时间越长;初级工况较低时,提前推力室点火和燃料节流阀转级时刻,有利于提高起动品质;涡轮泵转动惯量较大时,进入初级工况更平稳.
Abstract
The staged startup is an important measure to improve the startup quality and launch reliability of large thrust liquid-oxygen(LOX)/kerosene staged combustion rocket engines.The staged startup characteristics of the engine were studied by system dynamics simulation.The modular universal model library of transient simulation of liquid propulsion system(Tulips)was developed by using the Modelica language.Based on the model library,the system dynamics simulation models of the engine were built and validated layer-by-layer from bottom to top.The simulation results showed that,the startup quality was preferable when the prestage was set at the level where the thrust was higher than 40％of the rated value.The delay of entering the prestage was longer if the level of the prestage was lower.When the level of the prestage was low,the startup quality can be improved by advancing the moment of igniting the thrust chamber and the moment of transferring the resistance condition of the fuel throttle valve.If the turbopump rotational inertia was larger,the system became more stable when entering the prestage.
关键词
补燃发动机/分级起动/系统动态仿真/模型库/初级工况Key words
staged combustion rocket engine/staged startup/simulation of system dynamic characteristics/model library/prestage引用本文复制引用
出版年
2024
NETL
NSTL
万方数据