| 温度场内尺度估算方法的研究 |
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| 引用本文： | 吴晓庆.温度场内尺度估算方法的研究[J].力学学报,2011,43(5):856-860. |
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| 作者姓名： | 吴晓庆 |
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| 作者单位： | 中国科学院安徽光学精密机械研究所大气光学中心,230031 |
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| 基金项目： | 热带海洋气象科学基金; 国家自然科学基金(40475010); 科技部科技基础性工作专项(073D2g1391)资助项目~~ |
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| 摘 要： | 用三维超声风速计测量了合肥地区风速脉动和温度脉动数据, 从Kolmogorov
的4/5定律估算湍流动能耗散率\varepsilon, 从Yaglom的4/3定律估算温度方差
耗散率\varepsilon _\theta, 指出现有文献提供的公式不适合计算温度场的内
尺度. 提出了一种温度场内尺度计算公式, 式中含有温度方差耗散率\varepsilon
_\theta , 得到的内尺度大小正确反映了与C_n^2 强弱的对应关系.
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| 关 键 词： | 大气湍流 内尺度 温度方差耗散率 |
| 收稿时间： | 2010-10-21 |
| 修稿时间： | 2011-02-24 |
STUDY OF ESTIMATING INNER-SCALE OF TEMPERATURE FIELD |
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| Wu Xiaoqing.STUDY OF ESTIMATING INNER-SCALE OF TEMPERATURE FIELD[J].chinese journal of theoretical and applied mechanics,2011,43(5):856-860. |
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| Authors: | Wu Xiaoqing |
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| Institution: | Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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| Abstract: | The three velocity components and air temperature were
measured using a triaxial ultrasonic anemometer in Hefei region of China.
The mean dissipation rates of turbulent kinetic energy \varepsilon and
1/2 temperature variance \varepsilon _\theta have been estimated by
Kolmogorov's `four-fifths' law and Yaglom's `four-thirds' law, respectively.
It is pointed that the traditional method is not suitable for estimating
inner scale of temperature field. A new relation between the inner scale of
temperature field and 1/2 temperature variance \varepsilon _\theta is
presented. The results of estimating inner scale by the new proposed method
perfectly show that strong turbulence has small inner scales and weak
turbulence larger inner scales. |
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| Keywords: | atmospheric turbulence inner scales mean dissipation rates of 1/2 temperature variance |
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