High-Speed Thermographic Study of Convective Turbulence Characteristics over a Heated Surface

IF 0.9 Q4 OPTICS

Atmospheric and Oceanic Optics Pub Date : 2024-01-17 DOI:10.1134/S1024856023060027

M. V. Agafontsev, L. O. Gerasimova, V. V. Reino, A. N. Shesternin

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Abstract

The results of laboratory experiments on determining the characteristics of convective turbulence over a heated metal surface at different heights and temperatures are presented. We used the high-speed thermography and a high-speed IR camera, which allowed imaging the temperature field of low-inertia paper targets hung up above the heated surface simultaneously throughout the vertical plane of the field of view of the camera. Based on fluctuations in the temperature field of the target surface, we determined the heat transfer coefficient, the convective flux intensity, the total flux, and the amount of heat generated during measurements at different heights above the surface. The energy spectra of convective turbulence are plotted under various turbulent conditions. The analysis of the turbulence spectra shows the presence of an inertial interval with a slope close to the 8/3 power law for all considered heights above the heated surface, temperatures, and turbulence conditions. Characteristics of convective turbulence we found can be used when testing different laser beam adaptive optics control systems, studying the propagation of vortex laser beams and combustion centers, which are also characterized by convective turbulence with further transition to atmospheric turbulence induced by the combustion energy.

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加热表面对流湍流特性的高速热成像研究

摘要本文介绍了确定不同高度和温度下加热金属表面对流湍流特性的实验室实验结果。我们使用了高速热成像仪和高速红外摄像机，这使得悬挂在加热表面上方的低惯性纸靶的温度场能够在摄像机视场的整个垂直平面内同时成像。根据目标表面温度场的波动，我们确定了传热系数、对流通量强度、总通量以及在表面上方不同高度测量时产生的热量。绘制了各种湍流条件下对流湍流的能量谱。对湍流能谱的分析表明，在所有考虑的受热面上方高度、温度和湍流条件下，都存在斜率接近 8/3 幂律的惯性区间。我们发现的对流湍流的特征可用于测试不同的激光束自适应光学控制系统、研究涡旋激光束和燃烧中心的传播，其特征也是对流湍流，并进一步过渡到由燃烧能量引起的大气湍流。

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来源期刊

Atmospheric and Oceanic Optics OPTICS-

CiteScore

2.40

自引率

42.90%

发文量

期刊介绍： Atmospheric and Oceanic Optics is an international peer reviewed journal that presents experimental and theoretical articles relevant to a wide range of problems of atmospheric and oceanic optics, ecology, and climate. The journal coverage includes: scattering and transfer of optical waves, spectroscopy of atmospheric gases, turbulent and nonlinear optical phenomena, adaptive optics, remote (ground-based, airborne, and spaceborne) sensing of the atmosphere and the surface, methods for solving of inverse problems, new equipment for optical investigations, development of computer programs and databases for optical studies. Thematic issues are devoted to the studies of atmospheric ozone, adaptive, nonlinear, and coherent optics, regional climate and environmental monitoring, and other subjects.