分层水环境人工诱导内波的强化混合效果

发布时间：2018-02-24 00:23

  本文关键词： 内波 曝气 分层水环境 能量　出处：《中国环境科学》2017年08期 　论文类型：期刊论文

【摘要】：针对目前国内外缺乏对内波和水流上涌对水体混合的相对强弱关系研究的现状,采用近似计算的方法,提出了一种区分内波和水流上涌对水体混合所做贡献的新方法,定量计算了内波和水流上涌对水体混合的贡献率.在温度梯度、跃温层厚度、曝气器出水口位置均相同的条件下,当曝气强度从62.5L/(h·m~3)增加到125L/(h·m~3)时,内波对水体混合的贡献从82%降到了50%;在温度梯度、曝气强度、曝气器出水口位置均相同的条件下,随着跃温层厚度的增加,内波对水体混合的贡献从78.5%增加到83.5%.无消波装置的水体混合的有效功率比有消波装置的水体混合有效功率增加了40%以上,影响内波混合最根本的原因是所形成内波的A/T.实验证明内波只需要很少的能量就具有强大的混合作用,而曝气产生的循环水流的混合作用却截然相反,即内波混合具有较高的能量利用率,利用内波破坏水库水体分层和改善水源水质具有广阔的应用前景.
[Abstract]:In view of the lack of research on the relative strong or weak relationship between internal wave and upwelling water, a new method to distinguish the contribution of internal wave and upwelling to water body is proposed by using approximate calculation method. The contribution rate of internal wave and flow upwelling to water mixing was calculated quantitatively. When the aeration intensity increased from 62.5 L / h 路m ~ (3) to 125 L / h 路m ~ (3) when the temperature gradient, the thickness of temperature jump layer and the position of aerator outlet were the same, The contribution of internal wave to water mixing decreased from 82% to 50. Under the same temperature gradient, aeration intensity and the same position of aerator outlet, with the increase of temperature jump layer thickness, The contribution of internal waves to water mixing increased from 78.5% to 83.5. The effective power of water mixing without wave dissipation device increased by more than 40% compared with that of water body with wave dissipating device. The most fundamental reason for the internal wave mixing is the formation of the internal wave A / T. The experiment shows that the internal wave has a strong mixing effect with only a small amount of energy, but the mixing effect of the aerated circulating water flow is completely opposite. That is to say, internal wave mixing has high energy utilization ratio, and it has a broad application prospect to destroy the stratification of reservoir water and improve the water quality of source water by using internal wave.
【作者单位】： 西安建筑科技大学环境与市政工程学院;
【基金】：国家自然科学基金面上项目(51178379) 陕西省科技统筹创新工程计划项目(2015KTCL-03-15) 教育部高等学校博士点专项科研基金(20106120120012) 人力资源和社会保障部留学人员科研择优资助项目(DB03153)
【分类号】：X524
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本文编号：1528178