【作者】 王昌建； 郭长铭； 徐胜利； 张寒虹；

【Author】 Wang Changjian,Guo Changming ,Xu Shengli,Zhang Hanhong(Dept.of Mechanics and Mechanical Engineering,University of Science and Technology of China ,Hefei 230026)

【机构】 中国科学技术大学力学与机械工程系；

【摘要】 本文目的是对2H2/O2/Ar系统爆轰波在T形管中传播的新现象进行实验研究。采用压电传感器和烟迹片分别记录分叉口附近指定点压力时间曲线和胞格结构。结果表明:分叉口对稳定爆轰波传播的影响是局部的。在支管下游区域(自分叉口的距离大于4~6倍激波管截面边长),分叉口影响消失,爆轰波恢复稳定,且强度保持不变。胞格记录还表明:爆轰波在分叉口附近的波系演化与激波类似,即发生绕射和马赫反射。爆轰波在膨胀区中衰减、诱导激波阵面弯曲,支管中的三波点迹线清晰可见。与激波不同的是:爆轰波在诱导激波与化学反应阵面分离后的区域中出现二次点火。分叉口附近的胞格结构先消失再恢复,在无胞格和平衡胞格的中间区域存在细密胞格的过渡区。本文还对胞格结构中的几个特征参数进行了测量,并分析了这些参数与初压的关系。更多还原

【Abstract】 Gas detonation of 2H2/O2/Ar mixture propagating through a T-shape bifurcated tube with square cross-section was experimentally studied in this paper. Pizeo-electric transducers and smoke-foils were respectively used to record the pressure time history at specified ports and cellular structures. Results indicate that detonation wave is strongly weakened by the geometry around the T-shape of the tube. In the downstream region far away from 4 to 6 times the border length of the tube cross-section, the weakened detonation wave is re-established by the appearance of regular cellular structures with the same sizes as before. The cellular structures also denote the phenomena of diffraction, regular and Mach reflections of gas detonation which are similar to shock wave. In the pass-by tube, it is noted that cellular structure disappears in the region just downstream the start of the T-shape. The separation of leading shock and reaction zone is proven by such a phenomenon. With the propagation and reflection of the leading shock in the pass-by tube, the re-ignition occurs in the separated region between the leading shock and reaction zone. Re-ignition can be proved by the clustered cellular structures in the smoked-foils, and it is important in re-establishing of gas detonation. Also, several characteristic lengths and angles were measured in the smoked foils at different initial pressure of mixture.更多还原