糯扎渡水电站溢洪道泄槽流激振动试验研究

Experimental study on flow-induced vibration in spillway chute of Nuozhadu Hydropower Station

通过水弹性模型试验,研究糯扎渡水电站溢洪道泄槽隔墙通过宽大的F1和F3断层时的流激动力响应,并对其安全性进行评估。试验结果表明,糯扎渡水电站溢洪道泄槽隔墙模型实测基频分别为9.86Hz(干模态)及9.28Hz(湿模态),隔墙顶部最大泄洪振动响应发生在低泄量工况,其动位移均方根值达105.5μm。根据Meister感觉曲线可知,处于微有感觉或相当有感觉状况。隔墙的最大动应力振幅(3σ)为0.141MPa,可以认为隔墙在溢洪道正常泄洪时不会发生疲劳破坏。

Based on hydroelastic model experiments, a study was performed onthe dynamic response of flow-induced vibration in the spillway chute as its partition wall went through the wide fault F1 and F3, and the safety of the partition wall was evaluated. The result shows that the measured fundamental frequencies of the partition wall model were 9.86Hz in dry mode and 9.28 Hz in wet mode respectively, and that the maximal vibration response at the top of the partition wall induced by flood discharge occurred in the operational ease of low flood discharge, with the root mean square value of the dynamic displacement of the partition wall being 105.5 μm. According to the Meister feeling curve, the partition wall was in the states of little or considerable swing, and the maximal amplitude of dynamic stresses （3σ） was 0.141 MPa. Tberefore, the fatigue failure of the partition wall will not occur at the normal flood discharge of the spillway.