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Experimental and numerical investigation on effect of trash rack on flow properties at power intakes
ZAMM - Journal of Applied Mathematics and Mechanics ( IF 2.3 ) Pub Date : 2020-06-10 , DOI: 10.1002/zamm.202000017 Navid Aghajani 1 , Hojat Karami 1 , Hamed Sarkardeh 2 , Sayed‐Farhad Mousavi 1
ZAMM - Journal of Applied Mathematics and Mechanics ( IF 2.3 ) Pub Date : 2020-06-10 , DOI: 10.1002/zamm.202000017 Navid Aghajani 1 , Hojat Karami 1 , Hamed Sarkardeh 2 , Sayed‐Farhad Mousavi 1
Affiliation
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In the present experimental and numerical research, the flow behavior in a reservoir and horizontal water intake was analyzed in the presence of surface vortices. To do so, velocity field, vortex strength, and Reynolds number in different horizontal sections in the reservoir and the energy loss and entrained air volume at horizontal intake pipe at three different relative submerged depths (S/D = 1, 1.5 and 2) and five intake Froude numbers (Fr = 0.8, 1.0, 1.2, 1.4, and 1.6) were investigated by installing two trash racks with 64% and 70% openings and one intake without trash rack. The velocity field and vortex strength were measured using Particle Tracking Velocimetry. Reynolds number, velocity, energy loss, and entrained air volume at horizontal intake pipe were computed by numerical simulations. The commercially available computational fluid dynamics program Flow‐3D, was used for the numerical modeling. Numerical simulations were validated by the experimental data. The experimental tests revealed that trash rack presence has a significant effect on reducing the vortex strength and velocity on the water surface. The vortex strength was decreased by 11% and 16% in the trash racks with 70% and 64% opening, respectively. Energy loss clearly increased with the installation of a trash rack. Energy loss in the trash rack with 70% opening was approximately 19–26%. In addition, some relationships were provided for calculation of vortex strength, velocity, and local energy loss in the water intake, which are in good agreement with the studies in the literature.
中文翻译：
垃圾架对进气口流动特性影响的实验与数值研究
在目前的实验和数值研究中，在存在表面涡流的情况下分析了水库中的流动行为和水平取水口。为此，在三个不同的相对淹没深度（S / D = 1、1.5和2）下，油藏不同水平段的速度场，涡旋强度和雷诺数以及水平进气管的能量损失和夹带风量以及五个进气弗洛德数（Fr = 0.8、1.0、1.2、1.4和1.6）通过安装两个开口率分别为64％和70％的垃圾桶和一个不带垃圾桶的进水口进行研究。使用粒子跟踪测速仪测量速度场和涡旋强度。通过数值模拟计算了水平进气管的雷诺数，速度，能量损失和夹带风量。使用市售的计算流体力学程序Flow-3D进行数值建模。数值模拟得到了实验数据的验证。实验测试表明，垃圾架的存在对降低水面的涡流强度和速度具有显著作用。在开口率为70％和64％的垃圾桶中，涡流强度分别降低了11％和16％。垃圾桶的安装明显增加了能量损失。打开70％的垃圾箱中的能量损失约为19-26％。此外，还提供了一些关系来计算进水口中的涡流强度，速度和局部能量损失，这与文献中的研究非常吻合。
更新日期：2020-06-10
中文翻译：
垃圾架对进气口流动特性影响的实验与数值研究
在目前的实验和数值研究中，在存在表面涡流的情况下分析了水库中的流动行为和水平取水口。为此，在三个不同的相对淹没深度（S / D = 1、1.5和2）下，油藏不同水平段的速度场，涡旋强度和雷诺数以及水平进气管的能量损失和夹带风量以及五个进气弗洛德数（Fr = 0.8、1.0、1.2、1.4和1.6）通过安装两个开口率分别为64％和70％的垃圾桶和一个不带垃圾桶的进水口进行研究。使用粒子跟踪测速仪测量速度场和涡旋强度。通过数值模拟计算了水平进气管的雷诺数，速度，能量损失和夹带风量。使用市售的计算流体力学程序Flow-3D进行数值建模。数值模拟得到了实验数据的验证。实验测试表明，垃圾架的存在对降低水面的涡流强度和速度具有显著作用。在开口率为70％和64％的垃圾桶中，涡流强度分别降低了11％和16％。垃圾桶的安装明显增加了能量损失。打开70％的垃圾箱中的能量损失约为19-26％。此外，还提供了一些关系来计算进水口中的涡流强度，速度和局部能量损失，这与文献中的研究非常吻合。
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