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明渠是火/核电厂直流或循环供水工程中的重要取水形式。由于开敞水面大,明渠水温对气象条件较为敏感,实践中需明确气象条件变化对明渠水温的影响程度和规律。本文依托于华能东方电厂取水明渠,利用原体观测和数值模拟相结合的方法,对气象条件引起的明渠沿程水温变化开展了研究。研究表明,自然气象条件下,白昼期间明渠水温存在一定的沿程升高,夜间存在微弱的沿程降低趋势;宽阔海域明渠的水温升幅大于内陆明渠,水温沿程温升不超过0.1℃;夏季不利气象条件下取水明渠水温沿程温升较明显;晴朗天气下白昼温升明显高于夜间。
Nullahs are an important form of water intake for direct current / recycle water supplies in fire / nuclear power plants. Because of the large open water and the water temperature of open channel, it is more sensitive to the weather conditions. In practice, it is necessary to clarify the extent and laws of the influence of the changes of meteorological conditions on the water temperature of open channels. This paper relies on Huazhong Dongfang Power Plant water intake open channel, using the combination of the original observation and numerical simulation methods, the meteorological conditions caused by the open channel along the water temperature changes were studied. The results show that under natural weather conditions, the water temperature of open channel rises during the daytime and decreases weakly along the nighttime. The water temperature of the open channel in wide sea area increases more than that of the inland open channel, and the temperature rise does not exceed 0.1 ℃ along the waterway in summer. Under the meteorological conditions, the temperature of the water intake channel along the gully has obvious temperature rise; the daytime temperature rise under clear weather is obviously higher than that at night.