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中文摘要：
采用非定常雷诺应力湍流模式对三峡水轮机尾水管内的流动进行了数值模拟．分析了涡带的运动规律及其产生的水压力脉动的频率特性与相位特性和计算结果产生误差的原因，给出了改进的措施．研究结果表明，采用非定常雷诺应力湍流模式可以预测到尾水管内水压力脉动的频率特性，与现场试验的结果符合．
英文摘要：
This paper numerically simulated the flow in draft tube of the Three Gorge＇s prototype using non-steady RNS turbulence model and detailed analyzed the law of motion of the vortex rope as well as the frequency and phase characteristics of the water pressure pulsation produced yet it. Addi- tionally, this paper analyzed the reason of error of simulated results and improvement method. The research indicates that using the non-steady RNS turbulence model can predict the frequency characteristics of the pressure pulsation in draft tube and the result close agreement with the field test.
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