期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
基于分子弹性碰撞的大气声波衰减模型
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1. 湖南省安化县气象局, 湖南 益阳 413500;
2. 中国科学院 紫金山天文台, 江苏 南京 210008 -
DOI：10.11826/j.issn.1000-5854.2014.04.010
A Reduced Model for the Attenuation of Sound due to Molecular Collisions
摘要/Abstract
提出了一组考虑分子弹性碰撞的干空气-水汽双流体方程，利用该方程研究了水汽对大气声波衰减的影响.结果表明，当声波频率远低于弹性碰撞频率时衰减系数对水汽含量不敏感，越靠近弹性碰撞频率水汽含量的影响越明显；对于某一频率的声波衰减系数随混合比增加而增加.声波频率与分子弹性碰撞频率比是衡量弹性碰撞过程对声波衰减影响的重要参数，大气中氧分子-氮分子的弹性碰撞频率高达109Hz，其对可闻声衰减的影响可以忽略.研究结果有助于进一步理解分子碰撞过程对大气声波衰减的影响.
Based on a reduced two-fluid model for dry air and water vapor,the effect of water vapor on the attenuation of sound is studied.The results show that for waves with frequencies much less than the elastic collisional frequency between dry air molecule and water vapor molecule,the attenuation coefficient is insensitive to the mixing ratio.When the wave frequency becomes comparable or greater than the elastic collisional frequency,the attenuation due to water vapor becomes very strong.The result may help to understand the effects of molecular processes on the attenuation of sound.
关键词
参考文献 14
- [1] 潘乃先.由声雷达回波反演湍流场结构系数[J].应用气象学报,1997,8(4):477-484.
- [2] 潘乃先.声雷达定量测量C2T中的几个问题[J].大气科学,1993,17(1):44-51.
- [3] 许绍祖.大气物理学基础[M].北京:气象出版社,1993:551-565.
- [4] 韩金林.次声在雷暴探测中的应用[J].应用声学,1990,9(2):1-5.
- [5] 叶子祥,朱丰毅.雷暴次声探测记录的初步分析[J].气象,1981,7(7):9-11.
- [6] 周诗健.大气中的次声波[J].气象,1978,4(6):24-27.
- [7] 薛岩,周秀骥.大气衰减与声雷达探测[J].气象科学研究院院刊,1989,4(3):257-263.
- [8] 杨训仁,陈宇.大气声学[M].北京:科学出版社,2007:119-147.
- [9] 张景川,袁萍,欧阳玉花.雷声在大气中传播的吸收衰减特性研究[J].物理学报,2010,59(11):8287-8292.
- [10] 潘乃先,刘建强.声波逾量衰减的估算[J].大气科学,1991,15(4):116-122.
- [11] 徐家鸾,金尚宪.等离子体物理学[M].北京:原子能出版社,1981:130-196.
- [12] SOLER R,OLIVER R,BALLESTER J L.Magnetohydrodynamic Waves in a Partially Ionized Filament Thread[J].The Astrophysical Journal,2009,699:1553-1562.
- [13] FORTEZA P,OLIVER R,BALLESTER J L,et al.Damping of Oscillations by Ion-neutral Collisions in a Prominence Plasma[J].Astronomy & Astrophysics,2007,461:731-739.
- [14] LI B,CHEN L,WU D J.Effects of Inelastic Collisions on Alfven Waves in Partially Ionized Plasmas[J].Chinese Science Bulletin,2014,59(8):740-746.