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首页> 外文期刊>Annals of nuclear energy >Investigation on flow and breakdown characteristics of water film on vertical corrugated plate wall
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Investigation on flow and breakdown characteristics of water film on vertical corrugated plate wall

机译：垂直波纹板壁上水膜的流动和破裂特性研究

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Steam and water separation effect in the corrugated plate dryer plays a decisive role in the economic indicators of nuclear power plants. Investigation on flow characteristics of water film on vertical corrugated plate wall is beneficial to the research of steam-water separation mechanism and also plays an important role in the analysis of the water film flow characteristics and instability. In this paper, the water film thickness is measured by Planar Laser Induced Fluorescence (PLIF) technique. The relationship between the free falling water film thickness and time and the relationship between the average water film thickness and the water film Reynolds number are obtained, respectively. With probability density function (PDF), power spectral density (PSD) and wavelet analysis methods, the flow fluctuation instability of water film on the corrugated plate wall is analyzed. Characteristic frequency and vibration amplitude of water film flow fluctuation are obtained and the relationship between the water film thickness and the Reynolds number is fitted. Results reveal that the water film thickness has a certain regularity with the change of the Reynolds number and the two have a positive correlation. As the Reynolds number increases, the generation of solitary waves increases the water film volatility. The water film thickness is multi-frequency and has no obvious periodicity. When the water film Reynolds number in the experiment is less than 4055 and the flow is in a certain range of flow resistance, the water film breakdown will not happen owing to its own gravity. It indicates that the gravity have little influence on phenomenon of breakdown of a water film with a stable flow in a vertical corrugated plate. Therefore, the force which the water film is subjected to at the corrugated plate corner is analyzed. The model is established and the theoretical equation of the critical airflow velocity of water film breakdown and the water film thickness is derived as well. (C) 2018 Elsevier Ltd. All rights reserved.
机译：波纹板式干燥机中的蒸汽和水分离效果在核电站的经济指标中起着决定性的作用。研究垂直波纹板壁上水膜的流动特性，有利于研究汽水分离机理，在分析水膜的流动特性和不稳定性方面也具有重要作用。在本文中，水膜厚度通过平面激光诱导荧光（PLIF）技术测量。得到自由下落的水膜厚度与时间之间的关系，以及平均水膜厚度与水膜雷诺数之间的关系。利用概率密度函数（PDF），功率谱密度（PSD）和小波分析方法，分析了波纹板壁上水膜的流动波动不稳定性。得到水膜流量波动的特征频率和振动幅度，拟合水膜厚度与雷诺数之间的关系。结果表明，水膜厚度随雷诺数的变化具有一定的规律性，二者呈正相关。随着雷诺数的增加，孤波的产生会增加水膜的挥发性。水膜厚度是多频的，没有明显的周期性。当实验中的水膜雷诺数小于4055且流量在一定的流阻范围内时，由于自身的重力，水膜不会破裂。这表明重力对垂直波纹板中水流稳定的水膜破裂现象几乎没有影响。因此，分析了水膜在波纹板拐角处受到的力。建立了模型，导出了水膜破裂的临界气流速度和水膜厚度的理论方程式。 （C）2018 Elsevier Ltd.保留所有权利。

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