某电站泄洪雾流降雨数值计算研究

Study on the Flood Discharging Atomization in Hydropower Station by Mathematical Model

对于待建工程,一般采用模型试验和数值计算来模拟雾化水流的影响范围和程度。根据某电站工程具体情况,建立高水头、大泄量泄洪雾化计算模型,对其泄洪建筑物的各种运行工况下的雾化影响范围和降雨强度进行计算,研究分析泄洪雾化的影响。研究结果表明:雾化降雨大暴雨区主要位于下游水垫塘范围内,电厂及其尾水渠均处于暴雨区(降雨强度S≥10 mm/h)之外,部分工况下电厂左安装间和电厂尾水渠左侧位于毛毛雨区(10 mm/h>S≥0.5 mm/h),电厂厂房和尾水渠边坡受雾化降雨的影响较小。

Physical and numerical models are often used to estimate the affecting area and intensity of atomization in to-be-built projects. A mathematical model of atomization with high waterhead and big discharge was established for Qipei Project. The area affected by atomization and the rainfall intensity were simulated under several running cases of flood discharge of Qipei Project. Results suggest that heavy rainfall caused by atomization is mainly in the down- stream plunge pool; the powerplant and its tailwater channel are outside the heavy rainfall area （rainfall intensity S 〉110 mm/h） ; the left assembly bay and the left side of the tailwater channel are in the drizzle area（ 10 mm/h 〉 S≥0.5 mm/h） ; whereas the powerplant and the side slope of the tailwater channel are slightly affected by the atomization.