中文摘要：

为了研究有压泄洪洞闸室段设中隔墩后的绕流空化问题,通过减压模型试验,对3种不同体型中隔墩的水流空化特性进行了对比研究,试验测量了中隔墩头部上方及侧面的水流噪声,采用目测法、最大声压级差法、噪声能量比值法对其空化特性进行了综合分析。试验结果表明,在有压泄洪洞里,3种中隔墩体型都没有发生明显空化,且椭圆形头部最优,依次为尖形、半圆形;中隔墩头部较中部、尾部易于发生空化。此成果对类似工程的优化设计有参考意义。

英文摘要：

The cavitation characteristics of the middle-piers in discharge tunnels with pressure are experimentally investigated in the vacuum tank,under different conditions with three head shapes of middle-piers and three discharges.A comprehensive analysis of cavitation characteristics is performed in three ways：visual observation method,maximum sound pressure level（SPL） differences method and noise energy ratio method.The results show that there is no cavitation occurring for the three shapes of middle-piers,and the elliptical head of the middle-pier is optimal,and the semi-circular one is worse.Cavitation takes place easily at the head of the middle-pier,compared with the middle part and the tail part.