摘要
为获得有压管道孔板局部阻力相邻影响系数的计算公式,采用标准κ-ε紊流模型模拟有压管道内设置单个以及结构参数相同的两个孔板时的管道流动,通过计算值与实测值的对比,选出最优网格划分方案和模型参数。对Re>137 870时有压管道中两孔板局部阻力相邻影响系数随孔板孔径比、厚径比及相对间距的变化关系进行了数值模拟试验,应用量纲分析法和数值分析法,推导出两孔板相邻影响系数计算公式,并采用相邻影响系数修正了局部水头损失计算公式,对修正后的公式进行检验。结果表明,当孔板相对间距LS/D<8时,修正后的公式计算值与实测值的最大相对误差为8.33%,而未修正的叠加计算值与实测值的最大相对误差达86.03%,当孔板相对间距LS/D≥8时,按照传统方法计算两孔板产生的总局部水头损失精度更高。
In order to obtain the calculation formula of orifice plate＇s local resistance adjacent influence coefficient in pressure pipe,models via setting a single or two pieces of orifice plate deformation with the same structural parameters were simulated through the standardκ-εturbulence model.Compared the calculated results with the measured values,the optimal meshing scheme and model parameters were chosen.The numerical simulation experiment was applied to study the relationship of adjacent influence coefficient with changing of the aperture ratio,thick diameter ratio and the relative distance d when Reis greater than 137 870.The calculation formula of adjacent influence coefficient is deduced by using the dimensional analysis and numerical analysis method.The formula of local head loss was corrected and verified by the adjacent influence coefficient.The results show that when the relative distance of two orifice plates is less than 8,the minimum relative error of revised calculation values and measured values is 8.33%,and the maximum error is 86.03%;when the relative distance of two orifice plates is equal or greater than 8,the precision of the total local head loss is higher with the traditional calculation method.
出处
《水电能源科学》
北大核心
2016年第5期107-109,97,共4页
Water Resources and Power
基金
新疆研究生科研创新项目(XJGRI2014073)
关键词
有压管流
孔板
局部水头损失
相邻影响系数
pressure pipe flow
orifice plate
local head loss
adjacent influence coefficient
