竖井旋流泄洪洞不同衔接段体型对竖井底板压强的影响

发布时间：2018-06-03 20:08

  本文选题：竖井旋流 + 压坡出口　； 参考：《水电能源科学》2017年06期

【摘要】：结合某超高水头、大泄量竖井旋流泄洪洞的水工模型试验,对竖井与导流洞衔接段体型进行优化研究,重点比较了不同衔接段体型竖井底板的脉动压强。试验表明,当压坡出口面积增大时,水流紊动程度增加,竖井底板所受的最大脉动压强增大,且竖井底板出现最大脉动压强的工况也发生改变;通过分析压坡口面积与竖井底板所受最大脉动压强值之间的关系,引入了单位水体能量消耗量的概念,竖井水垫区单位水体需要消耗的能量越多,竖井底板所受的最大脉动压强就越大;加深消力井深度、沿长压坡长度及改变压坡孔口数量,均不能降低竖井底板所受的最大脉动压强。
[Abstract]:Combined with the hydraulic model test of a superhigh head and large discharge shaft swirling flood discharge tunnel, the shape optimization of the connection section between the shaft and the diversion tunnel is carried out, and the pulsating pressure of the bottom plate of the shaft with different shapes is compared. The test results show that when the pressure slope exit area increases, the turbulence degree of the flow increases, the maximum pulsating pressure on the bottom plate of the shaft increases, and the working condition of the maximum pulsating pressure on the bottom plate of the shaft also changes. By analyzing the relationship between the pressure groove area and the maximum pulsating pressure on the bottom plate of the shaft, the concept of energy consumption per unit water body is introduced. The more energy per unit water body needs to be consumed in the water cushion area of the shaft, the more energy is consumed in the unit water body. The greater the maximum pulsating pressure on the bottom plate of the shaft, the greater the depth of the stilling well, the length of the slope along the long pressure slope and the change of the number of hole holes in the shaft, all of which can not reduce the maximum pulsating pressure of the bottom plate of the shaft.
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【分类号】：TV135.2
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本文编号：1974018