有压管道孔板局部阻力相邻影响系数研究

发布时间：2017-12-26 20:26

本文关键词：有压管道孔板局部阻力相邻影响系数研究　出处：《水电能源科学》2016年05期 　论文类型：期刊论文

【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Re137 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/D8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。
[Abstract]:In order to obtain a local resistance pressure pipe orifice influence coefficient calculation formula, the standard k-e turbulence model to simulate the pipeline two pore plate pressure pipeline is arranged in the individual and structural parameters of the same flow, through the comparison of calculated and measured values, select the optimal mesh scheme and model parameters. The Re137 870 has local resistance two hole plate pressure pipeline influence coefficient with orifice aperture ratio, variation of thickness to diameter ratio and relative distance between the numerical simulation experiment, application of dimensional analysis and numerical analysis method, we derived the two hole plate adjacent influence coefficient formula, and the adjacent effect coefficient of local head loss the modified calculation formula, to test the modified formula. The results show that when the relative hole plate spacing LS/D8, the modified formula of maximum relative error and the measured value was 8.33%, and the superposition of uncorrected calculated value and the measured value of the maximum relative error of 86.03%, when the orifice relative spacing of LS/D = 8, calculated in accordance with the traditional method to produce two hole plate administration head loss of precision.
【作者单位】：新疆农业大学水利与土木工程学院;四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：新疆研究生科研创新项目(XJGRI2014073)
【分类号】：TV134
【正文快照】： 1引言总局部水头损失的准确计算是管道水力设计的重要内容,特别是在有多个形变件的有压输水管道中尤为突出。传统水力学中按阻力叠加原则计算出的总局部水头损失往往与实际不符[1,2],其原因在于形变件之间产生了局部阻力相邻影响现象[3]。贺益英等[4,5]等分别研究了电厂循环水

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