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工程科学与技术:2008,40(5):69-73
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高坝下游水体中溶解气体过饱和问题研究
(四川大学 水力学与山区河流开发保护国家重点实验室,四川 成都 610065)
The Supersaturation of Dissolved Gas in Downstream of High Dam
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投稿时间:2008-01-21    
中文摘要: 提出高坝下游水垫塘中总溶解气体(TDG)饱和度的计算与下游河道水体TDG饱和度的计算应采用不同的方法;并利用高速射流实验,及自行设计的产生TDG过饱和的实验装置,进一步分析了高坝下游水体中TDG过饱和的成因,找到了影响大坝下游TDG释放速率的主要因素。指出由于水垫塘中气泡被带入水体深处,使得水体存在溶解度梯度,溶解度沿着水深方向增加,深处水体能溶解更多的气体,在水流的紊动掺混下,高浓度的溶解气体被带入到较浅水深处,造成部分水体TDG过饱和。在没有掺气的条件下,过饱和溶解气体释放速率随着紊动强度的增大而增大,随着水深的增加而减少。
中文关键词: 总溶解气体  过饱和  饱和度  射流  紊动
Abstract:Different expressions were proposed for the computation of dissolved gas levels in the stilling basin and the river. Through high speed jet test and the device designed by authors TDG generation processes was analyzed deeply. It was found shows that the huge energy takes air bubbles into the bottom of the stilling basin during spill release, which makes air solubility increase along the depth of stilling basin,therefore the water in the bottom of the stilling basin can dissolve more gas than surface. Through strong turbulence in stilling basin the water with high concentration TDG mixes with the low concentration water, so dissolved gas in the part of water in stilling basin become supersaturation. It was also found that the velocity of supersaturation TDG increase with the levels of disorder without aerating.
文章编号:20080512     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(50469002)
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引用文本:
蒋亮,李然,李嘉.高坝下游水体中溶解气体过饱和问题研究[J].工程科学与技术,2008,40(5):69-73.
.The Supersaturation of Dissolved Gas in Downstream of High Dam[J].Advanced Engineering Sciences,2008,40(5):69-73.