摘要
本文采用水温物理模型,对锦屏一级水电站分层取水进行了模拟。从浮力相似准则出发,导出垂向温差换算关系,用以模拟库区水温分层流动。通过对上游来流分层加热,获得稳定的流速与水温边界,定量研究不同的运行工况下进水口下泄水温变化。研究结果表明,进水口取水运行将影响附近水温与流速场,在引水流量674m3/s情况下,影响范围可远达上游600m;在下泄水温偏低的3月～5月,进水口启用两层半叠梁门可使取水水温上升0.9℃～2.4℃,接近天然水温,以有利于下游生境恢复。
Physical model tests of water temperature were conducted to analyze the multi-level power intake of the Jinping stage-I hydropower station.To simulate the density stratified flow in this intake,a conversion formula of temperature stratification between the model and prototype was derived by buoyancy similarity.In the test a method of layered heating of upstream inflow was used to maintain stable profiles of velocity and temperature at the boundaries,and the influence of different operating conditions on the temperature of discharged water were studied quantitatively.The results show that the intake operation causes changes in the fields of water temperature and velocity upstream to the intake,and that under the flow rate of 674m3/s,these changes are significant over a distance of as far as 600m.In the period of lower temperature discharge from March to May,use of two and half layers of stoplog can cause a temperature rise of 0.9℃ to 2.4℃.The resulting temperature is close to natural river temperature and it favors the habitat restoration in the river downstream.
出处
《水力发电学报》
EI
CSCD
北大核心
2012年第1期129-134,共6页
Journal of Hydroelectric Engineering
关键词
环境水力学
水温物理模型
浮力相似
叠梁门分层取水进水口
水温分布
下泄水温
environmental hydraulics
physical model of water temperature
buoyancy similarity
multi-level intake with stoplog
water temperature distribution
discharged-water temperature
