高寒区多口融冰井引水渠道水温变化三维模拟及井群优化布置
发布时间：2018-12-07 13:31
【摘要】：为探讨抽水融冰技术解决严寒地区渠道冰害的效果,以新疆玛纳斯河流域红山嘴二级电站引水渠道为研究对象,对多口融冰井同时运行条件下引水渠道水温变化过程进行三维模拟,其模拟结果和原型观测结果平均相对误差为4.61%,验证了数值模拟的可靠性。在此基础上,通过改变井水流量、井前渠水流量和水温、外界大气温度等条件,对混合水温沿程变化过程进行了模拟。结果表明:1)仅将井水流量变为原来的50%和1.5倍时,井水注入量与混合水温成正比,且对混合水温的影响较大;2)仅将井前渠道水温分别降低和升高0.2和0.4℃时,井前渠道水温与混合水温成正比,且对混合水温的影响也较大,因此增大井水流量或者合理布置井群是抽水融冰最有效的方法;3)根据井前渠道水温为0.1℃,井前渠水流量分别为10、15、20和25 m~3/s,大气温度分别为 5、 10、 20和 30℃的模拟结果,得到了各井的不冻长度值,且随着井前渠道流量增大和外界大气温度降低,融冰井的不冻长度均随之减小,最后给出了在不同井前渠道流量和不同气温条件下融冰井的不冻长度和井的布置桩号等合理优化布置方案,此研究为解决寒区水电站引水渠道冰灾防治问题提供科学依据。
[Abstract]:In order to study the effect of freeze-thawing technique on channel ice damage in severe cold area, the diversion channel of Hongshanzui second stage hydropower station in Manas River basin of Xinjiang is taken as the research object. The variation process of water temperature in diversion channel under the condition of simultaneous operation of several ice melting wells is simulated. The average relative error between the simulation results and the prototype observation results is 4.61, which verifies the reliability of the numerical simulation. On this basis, the variation process of mixed water temperature along the course is simulated by changing the well water flow rate, the water flow rate and water temperature in the canal before the well, and the temperature of the atmosphere outside the well. The results show that: 1) when the well water flow rate is only 50% and 1.5 times of the original, the well water injection rate is directly proportional to the mixed water temperature, and the effect on the mixed water temperature is greater; 2) when the water temperature in front channel is reduced and raised by 0.2 鈩，
本文编号：2367278
[Abstract]:In order to study the effect of freeze-thawing technique on channel ice damage in severe cold area, the diversion channel of Hongshanzui second stage hydropower station in Manas River basin of Xinjiang is taken as the research object. The variation process of water temperature in diversion channel under the condition of simultaneous operation of several ice melting wells is simulated. The average relative error between the simulation results and the prototype observation results is 4.61, which verifies the reliability of the numerical simulation. On this basis, the variation process of mixed water temperature along the course is simulated by changing the well water flow rate, the water flow rate and water temperature in the canal before the well, and the temperature of the atmosphere outside the well. The results show that: 1) when the well water flow rate is only 50% and 1.5 times of the original, the well water injection rate is directly proportional to the mixed water temperature, and the effect on the mixed water temperature is greater; 2) when the water temperature in front channel is reduced and raised by 0.2 鈩，
本文编号：2367278
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