摘要
为了研究物理破裂诱导火灾爆炸过程中的点火机理和改进超燃、爆震燃烧中的点火技术,将乙炔/空气可燃混合气体在59mm×59mm方形激波管内由抛物面聚焦激波进行点火实验。采用高速摄影技术对入射激波经过抛物面反射和聚焦的过程进行跟踪,得到反射激波聚焦的阴影图片以及聚焦点火的纹影照片。实验结果显示:当乙炔与空气的混合比处于理论化学当量比时,马赫数为2.1的聚焦激波能够引燃乙炔/空气的混合气体。火焰由抛物面反射后聚焦所形成的气体动力学焦点产生,且沿抛物面传播的速度最快。
To study the mechanism of ignition in the fire explosion process induced by physical rupture and improve the ignition technology in supersonic combustion or detonation combustion,the acetylene/air combustible gas mixture is ignited in a 59 mm×59 mm rectangular cross section shock tube induced by paraboloid focusing shock waves.The high-speed photography technology is applied to observe the process of the incident shock wave focusing and reflecting by the paraboloid.Shaded pictures of reflected shock wave focusing and schlieren photographs of focusing ignition are obtained.The results show that the combustible mixture of acetylene/air can be ignited by the focusing shock wave(Ma=2.1),if the acetylene/air blended near the theoretical chemical stoichiometric ratio.The flame is generated at the gas dynamics focus formed by the paraboloid reflection and focusing,and the spread speed of the flame is the fastest along the paraboloid.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2013年第3期427-430,共4页
Journal of Nanjing University of Science and Technology
基金
国家自然科学基金(10472047)
关键词
抛物面聚焦
激波
点火
乙炔
空气
paraboloid focusing
shock waves
ignition
acetylene
air
