不同因素对沿程汇流多孔流体分布管压力分布的影响

为了研究不同因素(水深、开孔比、长径比等)对沿程汇流多孔流体分布管压力分布的影响,采用流体力学基本原理,从理论角度分析论证了不同因素对压力分布的影响,提出了压力分布综合表达式。通过室内模型试验结果分析并验证综合表达式,结果表明:压力随水深、开孔比的增加而增加。当开孔比相对较大时,压力分布的均匀性将会降低;压力随长径比的增加而增加,但增加值相对较小。多孔流体分布管在汇流过程中,管长前1/3段压力变化值较小,后段较为显著。在这些影响因素中,长径比对压力分布的影响最小,但是长管压力分布的均匀性比短管好。压力分布综合表达式经试验验证拟合效果较好,可以为多孔流体分布管的设计和应用提供参考。

Influences from various factors on pressure distribution of perforated pipe along confluence

In order to study the influences from various factors ( water depth，opening ratio and length-diameter ratio，etc. ) on the pressure distribution of the perforated pipe along the confluence， the influences from various factors on the pressure distribution are demonstrated herein with the basic principles of fluid mechanics，and then a synthetic expression of pressure distribution is proposed herein. The synthetic expression is analyzed and verified through the analysis of the relevant indoor model experiment， from which the result shows that the pressure is increased along with the increases of water depth and opening ratio. When the opening ratio is relatively large， the uniformity of pressure distribution is to be decreased，while the pressure is increased along with the length-diameter ratio，but the increment value is relatively small. During the confluence of the perforated pipe， the pressure variation value of the first 1/3 of the pipe length is small，but that of the later section is more significant. Within these influencing factors， the influence from the length-diameter ratio is the smallest，but the uniformity of pressure distribution of long pipe is better than that of the short one. Through the relevant experimental verification， the fitting effect of the synthetic expression of pressure distribution is better and then can provide reference for design and application of perforated pipe.