高寒区抽水融冰渠道水温沿程衰减规律——以红山嘴水电站为例  

Water temperature attenuation process of diversion channel for pumping well water to melt ice in high altitude and cold regions: a case study on the Hongshanzui Hydropower Station

作　　者：郑铁刚[1] 宗全利[2] 孙双科[1] 吴素杰 ZHENG Tiegang;ZONG Quanli;SUN Shuangke;WU Sujie(Sate Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;College of Water Conservancy and Architectural Engineering,Shihezi University,Shihezi 832000,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟及调控国家重点实验室,北京100038 [2]石河子大学水利建筑工程学院,新疆石河子832000

出　　处：《水科学进展》2018年第5期667-676,共10页Advances in Water Science

基　　金：国家重点研发计划资助项目(2016YFC0401708);国家自然科学基金资助项目(51269028)~~

摘　　要：抽水融冰技术是解决高寒区引水式电站冬季运行冰害问题的有效措施之一。为研究抽水融冰对电站引水渠道冬季引水的水温控制规律,以红山嘴水电站为例,基于RNGκ-ε模型数值模拟研究结果,从热流量比角度探讨了渠道水温沿程衰减规律,并采用2013年2月和2014年1月原型观测结果进行了验证。结果表明:渠道水温沿程衰减过程可分为骤降段、过渡段和缓降段3部分,各段范围受外界条件控制;衰减曲线呈幂函数分布,相关系数达到98%;对比气温对渠温沿程衰减的影响表明,随着大气温度的降低,渠道水温沿程衰减速度明显加快;-10℃为水温衰减过程变化转折点,当气温高于-10℃时,可以近似认为渠温衰减规律一致,渠温沿程变化主要受到热流量比值影响;低于-10℃时,气温对渠道水温沿程变化影响显著。Pumping well water to melt ice is one of the most effective measures to resolve the ice problem for diversion power station in high altitude and cold regions.In order to investigate the water temperature attenuation process of diversion channel for pumping well water to melt ice in winter,the prototype observations were conducted at Hongshanzui Hydropower Station in February 2013 and January 2014,respectively,which verified the numerical simulation results.Based on the numerical simulation results in the RNG k-ε model,the water temperature attenuation process of diversion channel was analyzed from the point of heat flux ratio.The analysis reveals that the water temperature attenuation process included three periods：rapidly-reducing period,transitional period and slowly-descending period.Each period was influenced by different thermal conditions.In addition,the curve of water temperature attenuation followed a power function with a correlation coefficient of 0.98.Compared the water temperature attenuation processes with the changes of atmospheric temperature,the attenuation rate of water temperature significantly increased with the decrease of atmospheric temperature.The turning point of the water temperature attenuation process was at-10℃.When the atmospheric temperature was above-10℃,the attenuation law of water temperature remained consistent and was mainly influenced by the ratio of heat flux.However,if the atmospheric temperature was below-10 ℃,it significantly affected the channel water temperature.

关 键 词：抽水融冰 水温 衰减规律 热流量 高寒区 

分 类 号：TK79[动力工程及工程热物理—流体机械及工程]