| 收缩楔腔内激波汇聚诱导点火实验 |
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| 作者姓名： | 杨剑挺 朱雨建 詹东文 杨基明 |
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| 作者单位： | 中国科学技术大学激波实验室, 安徽合肥 230027 |
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| 摘 要： | 文章提出了一种采用圆柱形汇聚激波实现可燃气体点火特性研究的新方法.通过采用激波动力学理论合理地设计壁面型线, 将激波管中产生的平面运动激波近乎连续地转变为扇形区内圆柱形汇聚激波.以氢氧预混气体为考察对象, 开展了相关激波管实验, 实现了可控圆柱面激波汇聚诱导点火.实验发现两种点火现象:强点火和弱点火.在强点火过程中, 点火由入射激波直接诱导产生; 而在弱点火过程中, 点火则是在波后气流经历热压缩过程后发生.
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| 关 键 词： | 激波 激波诱导点火 火焰传播 激波动力学 |
| 收稿时间： | 2015-10-08 |
Experiment on the Shock-Induced Ignition in a Converging Wedged Cavity |
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| Affiliation: | Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China |
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| Abstract: | A new type of experimental method was proposed for the investigation of ignition behaviors by using a smoothly convergent cylindrical shock wave. The cylindrical shock wave is generated with a specially designed wall contour based on shock dynamic theory that can transform a planar shock front into a curved cylindrical one and propagates along a following wedged convergent channel. The experiments were conducted in a shock tube filled with H2 / air combustible mixture. Two kinds of ignition modes were observed under current experimental conditions. When the contraction is sufficiently large, the enhancement of the converging shock will result in a sudden occurrence of the ignition soon after the passage of the incident shock. On the other hand, if the intensity of the converging shock is not sufficiently strong, a mild ignition starts at the vicinity of the outlet, in which a combustion driven precursor shock and a following flame move towards upstream separately. When the flame overtakes the precursor shock, the overlap results in an onset of a detonation. |
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