本文選題：VOF法 + 數(shù)值模擬　； 參考：《水電能源科學(xué)》2017年03期

【摘要】：為研究輸水系統(tǒng)中堰井段水面的波動(dòng)現(xiàn)象,采用Realizableκ-ε紊流模型耦合VOF法對(duì)分段低壓輸水系統(tǒng)進(jìn)行二維數(shù)值模擬,分析了堰后水深對(duì)水面波動(dòng)規(guī)律的影響,探討了在外加擾動(dòng)作用下水面波動(dòng)的規(guī)律。結(jié)果表明,堰后存在高、低兩個(gè)水位區(qū)間,堰后水位處于這兩個(gè)區(qū)間時(shí),水面將會(huì)以某一主要頻率穩(wěn)定持續(xù)地波動(dòng);當(dāng)堰后水位處于這兩個(gè)區(qū)間之外時(shí),水面波動(dòng)變得無(wú)規(guī)律或只有微弱的波動(dòng)。外加擾動(dòng)對(duì)水面波動(dòng)會(huì)造成一定影響,當(dāng)外加擾動(dòng)頻率與水面波動(dòng)固有頻率一致時(shí),即使外加擾動(dòng)強(qiáng)度很小也會(huì)引起水力共振,水面波動(dòng)幅度大大增加;外加擾動(dòng)頻率與固有頻率相差較大時(shí),水面波幅在某些特定時(shí)刻達(dá)到最大,然后減小到最小值,再增大到最大值,波動(dòng)幅值的變化呈周期性,并推導(dǎo)出了相應(yīng)的周期公式,為相關(guān)研究提供了參考。
[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.
【作者單位】： 河海大學(xué)水利水電學(xué)院;
【分類號(hào)】：TV135

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