| 亚声速球/柱尾流对激光传输影响的数值模拟 |
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| 引用本文： | 关奇,杜太焦,陈志华,闫伟,彭国良.亚声速球/柱尾流对激光传输影响的数值模拟[J].红外与激光工程,2017,46(9):906005-0906005(7). |
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| 作者姓名： | 关奇 杜太焦 陈志华 闫伟 彭国良 |
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| 作者单位： | 1.西北核技术研究所,陕西 西安 710024 |
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| 基金项目： | 国家自然科学基金（91330205） |
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| 摘 要： | 采用大涡模拟方法计算了来流速度为0.4 Ma情况下球/柱形结构附近的流场，根据密度数据计算了光程差及气动相屏，并研究了尾流对激光传输的影响。结果表明:光程差空间均方根的时间平均值随发射角增大而增大，发射角从120增加到148时，其数值从0.11 m增加到0.28 m；光程差空间均方根随时间变化剧烈，发射角为148时，其时间均方根可达0.04 m；球/柱尾流对激光传输有很大影响，发射角为148情况下，Strehl比的时间平均值为0.33，并且Strehl比的时间平均值随发射角的增大而减小，发射角从120增加到148过程中，Strehl比的时间平均值减小了59%；Strehl比随时间变化剧烈，其时间均方根大于0.05。
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| 关 键 词： | 尾流 气动光学效应 激光传输 大涡模拟 |
| 收稿时间： | 2017-01-10 |
Numerical simulation of laser propagation effects through subsonic hemispherical/cylindrical wake |
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| Affiliation: | 1.Northwest Institute of Nuclear Technology,Xi'an 710024,China |
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| Abstract: | Compressible large eddy simulation was carried out to study the flow field around a hemispherical/cylindrical structure at Mach number of Ma=0.4. Optical path difference and aero-optical phase were calculated according to density data obtained by the large eddy simulation method, and then the aero-optical effect of the wake was studied. The results show that the time-averaged root-mean-square of optical path difference increases with the angle of projection, and it varies from 0.11 m to 0.28 m when the angle of projection increases from 120to 148. Besides, the root-mean-square of optical path difference changes dramatically over time, and its temporal root-mean-square value reaches 0.04 m when the angle of projection is 148. The wake of the hemispherical/cylindrical structure has great effect on laser propagation, and the time-averaged Strehl ratio is 0.33 for the angle of projection of 148. The time-averaged Strehl ratio decreases with the angle of projection, and it reduces 59% when angle of projection increases from 120to 148. The Strehl ratio also changes dramatically over time, and its temporal root-mean-square value is 0.05. |
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