摘要
为了探究两种含硼固体推进剂在水冲压条件下的燃烧与推力性能,本文以跨介质飞行器水下动力装置为应用背景,设计了水冲压发动机原理样机并开展了地面实验研究。试验结果表明,发动机实现了持续稳定工作,燃烧产物沉积主要集中于进水口位置,验证了硼基水冲压发动机的可行性。四次试验中燃烧效率最高达到了86.8%,在水燃比为3.2时比冲达到了4712.5 N·s/kg。在水燃比相近时,两种推进剂的燃烧效率均在69%左右,但推进剂Ⅱ的补燃室内存在更多沉积物,发动机比冲效率降低了13.8%。提高水燃比能提高燃烧效率和比冲,水燃比从1.75增加到3.20,燃烧效率提升了6.1%,并且还能减少燃烧产物的沉积。两种推进剂中一、二次燃烧产物中均含有碳化硼和硼酸等物质,但由于推进剂Ⅱ中Mg,Al的含量较高,其产物中能明显检测出氧化镁和铝酸镁。
In order to explore the combustion and thrust performance of two boron-containing solid propellants in water ramjet,a prototype of water ramjet engine is designed and ground tests are carried out based on the application background of underwater power plant of transmedia aircraft.The continuous and stable operation of engine is realized and the deposition of combustion products is mainly concentrated in the water inlet.It verifies the feasibility of boron-based water ramjet.The highest combustion efficiency reaches 86.8%in four tests.And the specific impulse reaches 4712.5 N·s/kg when the water-fuel ratio is 3.2.When the water-fuel ratio is similar,the combustion efficiency of the two propellants is about 69%.However,there are more deposits in the afterburning chamber of propellantⅡand the specific impulse efficiency of the engine decreases by 13.8%.Increasing the water-fuel ratio can improve the combustion efficiency and specific impulse.The water-fuel ratio increases from 1.75 to 3.20,the combustion efficiency is improved by 6.1%,and the deposition of combustion products can be reduced.Both the primary and secondary combustion products of the two propellants contain boron carbide and boric acid.Due to the high content of Mg and Al in propellant II,magnesium oxide and magnesium aluminate can be obviously detected in its products.
作者
薛鸿涵
黄利亚
张家瑞
刘子豪
肖帆
XUE Honghan;HUANG Liya;ZHANG Jiarui;LIU Zihao;XIAO Fan(College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)
出处
《推进技术》
北大核心
2025年第5期257-264,共8页
Journal of Propulsion Technology
基金
国家自然科学基金(12302394)
湖南省自然科学基金(2023JJ0635)。
关键词
固体火箭冲压发动机
水冲压发动机
含硼固体推进剂
直连试验
燃烧性能
沉积
Solid rocket ramjet
Water ramjet
Boron-based solid propellant
Direct connection experiment
Combustion performance
Deposition
