| 激光引致水诱导空气击穿所获无约束流场演化过程的实验研究 |
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| 引用本文： | 崔村燕,洪延姬,王广宇.激光引致水诱导空气击穿所获无约束流场演化过程的实验研究[J].航空学报,2009,30(9):1566-1570. |
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| 作者姓名： | 崔村燕 洪延姬 王广宇 |
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| 作者单位： | 1. 西北工业大学,航天学院,陕西,西安,710072;装备指挥技术学院,北京,101416
2. 装备指挥技术学院,北京,101416 |
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| 基金项目： | 国家“973”基础研究;;国家自然科学基金(10672184) |
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| 摘 要： | 流场演化过程是揭示激光推进机理的重要研究内容之一。利用纹影系统和PCO-HSFC 高速相机，首次拍摄了自来水诱导CO2激光击穿空气产生的激波向空气和水中的演化过程。阐述了产生两次气蚀空穴的原因：初始时刻产生的空穴为激波作用于水面所致，第二次空穴出现在相机被触发后约8 μs 时，是激光烧蚀水蒸气作用于水面所形成的低压区。实验结果表明：击穿后流场向激光入射方向（空气中）演化较快，激波初速度较大，约为6 km/s；流场向水中演化相对较缓，激波初速度约为3.33 km/s。两者都服从指数衰减，分别在约73.368 μs 和41.649 μs 时衰减到声速。研究结果对于把水作为工质应用于激光推进有一定意义。
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| 关 键 词： | 激光推进 击穿 激波 气蚀空穴 纹影系统 |
Experimental Study on Evolution Process of Unconfined Flow Produced by Laser-induced Air Breakdown with Water as an Induction |
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| Cui Cunyan,Hong Yanji,Wang Guangyu.Experimental Study on Evolution Process of Unconfined Flow Produced by Laser-induced Air Breakdown with Water as an Induction[J].Acta Aeronautica et Astronautica Sinica,2009,30(9):1566-1570. |
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| Authors: | Cui Cunyan Hong Yanji Wang Guangyu |
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| Institution: | 1. College of Astronautics;Northwestern Polytechnical University;Xi'an 710072;China;2. Academy of Equipment Command and Technology;Beijing 101416;China |
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| Abstract: | It is important to study on evolution of flux-field to discover the mechanism of thrust formation in laser propulsion.The process of shock wave spread in air and water is obtained by a set of schlieren systems and a high speed framing camera,during which the shock waves are generated by CO2 laser-induced air breakdown with water as induction.It is found that cavitation appears two times.The first is caused by action of shock wave on water surface,which appears at initial time;the second is a low-pressure ar... |
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| Keywords: | laser propulsion breakdown shock waves cavitations schlieren system |
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