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首页> 外文期刊>Journal of Civil Engineering and Science >3-D Investigation of Velocity Profile and Pressure Distribution in Bends with Different Diversion Angle
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3-D Investigation of Velocity Profile and Pressure Distribution in Bends with Different Diversion Angle

机译：不同分流角弯管中流速分布和压力分布的3-D研究

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摘要

This paper describes numerical investigation of velocity profile and pressure distribution of 3-D bends with different diversion angles via CFD model. Reynolds number, diversion angle and section angle, are introduced as important variable parameters of current study. Reynolds number's range was 100 to 1900 and the diversion angles of bends were 90, 135 and 180 degree with regard to inlet flow. The mail goal of current study is to investigate the effect of Reynolds number and the diversion angle on velocity profiles and pressure distribution. It is worth mentioning that the experimental results of former study in a 90-degree bend are used for validating the numerical model. Studies of velocity profiles show that by increasing the section angle, the velocity profile inclines to outer wall, and maximum deviation from inlet velocity profile happens at 45 section angle. Also the maximum velocity occurs at 0.7 to 0.9 of the pipe diameter from inner wall. By increasing the section angle, the pressure profile inclines to outer wall and in this inclination, pressure loss is observed. For low Reynolds numbers, the variation of pressure loss is linear but by increasing the Reynolds number maximum pressure loss happens at limited section angle.
机译：本文通过CFD模型描述了不同转向角的3-D弯管的速度分布和压力分布的数值研究。雷诺数，转向角和截面角被引入作为当前研究的重要变量参数。雷诺数的范围是100到1900，折弯的转向角相对于进口流量分别为90度，135度和180度。当前研究的目的是研究雷诺数和转向角对速度分布和压力分布的影响。值得一提的是，以前的研究在90度弯曲中的实验结果用于验证数值模型。速度分布图研究表明，通过增加截面角，速度分布图会倾斜到外壁，并且与入口速度分布图的最大偏差发生在45个截面角处。同样，最大速度出现在从内壁开始的管道直径的0.7到0.9处。通过增加截面角度，压力分布会倾斜到外壁，并且在这种倾斜下会观察到压力损失。对于低雷诺数，压力损失的变化是线性的，但是通过增加雷诺数，最大压力损失发生在有限的截面角处。

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