摘要
发展了一种采用新型高金属粉丁羟推进剂消氢发动机,该发动机可通过产生高温金属粒子流,消除以液氢为燃料的火箭发射前排出的低温氢气的危险。该发动机在小于0.2 MPa特低压下工作时,存在点火延迟、“喘振”不稳定燃烧和火焰无金属粒子流现象。分析了引起发动机点火延迟和“喘振”的原因;从理论上探讨了影响低压下发动机点火延迟的因素,得到换热系数影响最显著;通过引入高燃速引燃药和降低点火峰值压强,解决了发动机点火延迟和“喘振”的问题,发动机点火延迟时间由大于3 s降低到600 ms左右,发动机燃烧稳定;通过选用合适的金属粒子、推进剂配方燃温和长尾管结构,解决了金属粒子流发生问题,可稳定喷射出1141 K的高温金属粒子流,实现了消除火箭周围低温氢气的目的。
A new type of hydrogen-eliminated motor with high content metal powder HTPB propellant was developed.By producing high temperature of metal powder stream,the motor which can eliminate the risk of low temperature hydrogen released from rocket which contain LH 2 as fuel before rocket launch.Worked at very low pressure as below 0.2 MPa,the motor existed the phenomena of ignition delay,“gasp”unsteady combustion and no metal powder stream in flame.The phenomena of ignition delay and“gasp”unsteady combustion were analyzed.Factors of the causing of ignition delay at low pressure were discussed theoretically,and it was found that the coefficient of heat transfer was the most prominent factor.The difficulties of ignition delay and“gasp”unsteady combustion were overcome by introducing a high burning rate ignite propellant and by reducing the igniter peak pressure.By these methods,the ignition delay time reduced from more than 3 s to about 600 ms and the motor burned steadily.The problem of no metal powder stream in flame was tackled by selecting right metal powder,propellant formula with suitable combustion temperature and long tail pipe.The motor could produce 1141 K high temperature metal powder stream in flame,and the aim to eliminate low temperature hydrogen around rocket was attained.
作者
余小波
王健
邓康清
庞爱民
朱雯娟
王相宇
李颖
向进
刘学
王鹍鹏
杨育文
刘俊明
YU Xiaobo;WANG Jian;DENG Kangqing;PANG Aimin;ZHU Wenjuan;WANG Xiangyu;LI Ying;XIANG Jin;LIU Xue;WANG Kunpeng;YANG Yuwen;LIU Junming(Hubei Institute of Aerospace Chemistry Technology,Xiangyang 441003,China;Beijing Institute of System Engineering,Beijing 100101,China;Key Laboratory of Aerospace Chemical Power Technology,Xiangyang 441003,China)
出处
《固体火箭技术》
CAS
CSCD
北大核心
2021年第5期643-649,共7页
Journal of Solid Rocket Technology
关键词
丁羟推进剂
消氢发动机
固体发动机
金属粉
点火燃烧
低压
HTPB propellant
hydrogen-eliminated motor
solid rocket motor
metal powder
ignition and combustion
low pressure
