倒虹吸工程水力学模型试验

为研究大型倒虹吸水力特性,通过新疆北部某倒虹吸工程1∶16的水工模型试验,对不同运行工况下倒虹吸过流能力、水流流态及压力分布等问题进行研究。试验结果表明,水头损失实测值与设计计算值较接近,满足设计要求;在设计流量下管道最大压力位于倒虹吸管最低段末端且小于设计值;但充水过程中,流量由13m3/s增至15m3/s时,发现上游进水口有间歇性立轴漩涡形成。为了保证工程的正常运行,建议对上游沉沙池与消力池之间渠道进行优化。

Model Test on Engineering Hydraulics of Inverted Siphon

In order to study the hydraulic characteristics of the large inverted siphon,the flow capacity,flow pattern,and pressure distribution under different operating conditions had been investigated based on the hydraulic model test of the inverted siphon within a scale of 1:16 from an engineering project in North Xinjiang.The results indicated that the measured head loss values and the design calculation values are close and they meet the design requirements.Under the design flow discharge,the maximum pressure within the pipe was located at the low end of the inverted siphon and it is lower than the design pressure value.However,during the water-filling process,the intermittent vertical vortex formed at the upstream intake when the flow discharge increased from 13 to 15 m3/s.Therefore,in order to ensure the operation of the project,it is recommended to optimize the channel between the upstream silting basin and the stilling basin.