摘要
为揭示约束条件下瓦斯爆炸火焰结构的动力学演化过程,通过实验研究了管道内瓦斯爆炸火焰的动力学行为及其对火焰阵面结构的影响规律。实验过程中采用高速纹影摄像技术清晰捕捉到了瓦斯火焰传播过程中的细微结构特性,分析了火焰速度与压力波对火焰结构的干涉作用;研究发现火焰局部速度变化是火焰结构变化的直接因素,而流动与火焰面相互作用是火焰结构变化的内在原因;压力波直接影响火焰表观速度,而其内在作用是对流动的干涉过程导致湍流强度增大,进而使火焰阵面结构发生失稳变形。
To reveal flame structure dynamic evolution process of gas explosion under restricted condition, the premixed gas explosion was performed in a semi-vented pipe to explore the interaction between dynamic parameters and flame front structure. In the test, high speed schlieren photograph system was applied to record the explosion flame micro- structure and propagation behavior, and the influence of flame speed and pressure wave on flame structure was dis- cussed in detail. The results show that asymmetrical flame speed leads to local flame structure transition directly, while the inner mechanism is the interaction between flow and flame structure. Pressure wave plays an important role on flame speed apparently ,which enhances turbulence greatly, and further causes flame structure unstable.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第2期246-249,共4页
Journal of China Coal Society
基金
国家自然科学基金资助项目(50804038)
教育部博士点专项基金资助项目(200804971055)
爆炸科学与技术国家重点实验室开放基金资助项目(KFJJ07-06)
关键词
瓦斯爆炸
火焰结构
高速纹影
压力波
gas explosion
flame structure
high speed schlieren photograph
pressure wave
