分段低压输水系统中堰井段水面波动数值模拟

发布时间：2018-06-07 23:30

本文选题：VOF法 + 数值模拟　；参考：《水电能源科学》2017年03期

【摘要】：为研究输水系统中堰井段水面的波动现象,采用Realizableκ-ε紊流模型耦合VOF法对分段低压输水系统进行二维数值模拟,分析了堰后水深对水面波动规律的影响,探讨了在外加扰动作用下水面波动的规律。结果表明,堰后存在高、低两个水位区间,堰后水位处于这两个区间时,水面将会以某一主要频率稳定持续地波动;当堰后水位处于这两个区间之外时,水面波动变得无规律或只有微弱的波动。外加扰动对水面波动会造成一定影响,当外加扰动频率与水面波动固有频率一致时,即使外加扰动强度很小也会引起水力共振,水面波动幅度大大增加;外加扰动频率与固有频率相差较大时,水面波幅在某些特定时刻达到最大,然后减小到最小值,再增大到最大值,波动幅值的变化呈周期性,并推导出了相应的周期公式,为相关研究提供了参考。
[Abstract]:In order to study the fluctuation of water surface in Weir well section in water conveyance system, a two-dimensional numerical simulation was carried out by using the realizable 魏-蔚 turbulent model coupled with VOF method. The influence of water depth after Weir on water surface fluctuation was analyzed. The law of water surface fluctuation under the action of external disturbance is discussed. The results show that there are two water levels at the back of the Weir. When the water level is in these two zones, the water level will fluctuate steadily and continuously at a certain main frequency, and when the water level behind the Weir is outside the two intervals, Water surface fluctuations become irregular or have only slight fluctuations. When the external disturbance frequency is consistent with the natural frequency of the water surface wave, even if the external disturbance intensity is very small, it will cause hydraulic resonance, and the fluctuation amplitude of the water surface will increase greatly. When the external disturbance frequency is different from the natural frequency, the amplitude of water surface wave reaches the maximum at certain time, then decreases to the minimum value, then increases to the maximum value. The fluctuation amplitude changes periodically, and the corresponding periodic formula is derived. It provides a reference for related research.
【作者单位】：河海大学水利水电学院;
【分类号】：TV135

【相似文献】