学术
大气模式下多脉冲激光推进的数值模拟
许仁萍[1,2] 唐志平[1,2]
[1]中国科学院材料力学行为和设计重点实验室,合肥230026 [2]中国科学技术大学力学和机械工程系激光推进实验室,合肥230026
摘 要:
研究了大气模式激光推进中多脉冲推进的冲量耦合系数低于单脉冲推进的冲量耦合系数的机理。将飞行器设为可动模型，利用商业软件FLUENT的动网格方法对多脉冲推进进行了数值模拟，解决了已往分段计算中忽略后期流场信息造成的偏差大的问题。结果表明：多脉冲推进的平均冲量耦合系数随脉冲数的增多而降低，但是下降趋势渐缓，计算结果与实验相符；气体开始逃逸之后的后期流场与飞行器的相互作用对推进性能的影响不能忽略。[著者文摘]
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文章出处:
《强激光与粒子束》-2007年19卷3期 -369-372页
栏目信息:
文献标识码:
A
文章编号:
1001-4322（2007）03-0369-04
Numerical simulation for laser propulsion of air breathing mode considering multi-pulses
XU Ren-ping, TANG Zhi-ping （1. Key Laboratory for Mechanical Behavior and Design of Materials, Chinese Academy of Sciences, Hefei 230026, China; 2. Laser Propulsion Laboratory, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China）
Abstract:
In the experiments, it was found that the momentum coupling coefficient of multl-pulse propulsion was lower than that of the single pulse case for the air-breathing mode. To learn the mechanism of this phenomenon, the multi-pulse simulation of the parabolic flyer taken as a moving object was carried out using the dynamic mesh method of the commercial code FLUENT, the error that made by neglecting the after-effect of the flow field was taken into account. The results show that the average momentum coupling coefficient decreases with the number of the laser pulses, but the trend of slewdown is obvious. The simulation resuits agree well with the experimental results, and the after-effect of the flow field induced by the laser pulse can not be neglected.[著者文摘]
Key words:
Laser propulsion; Multi-pulse simulation; Moving boundary; Dynamic mesh; UDF
基金资助:
国家973计划项目资助课题
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