Journal of Civil Engineering Research
p-ISSN: 2163-2316 e-ISSN: 2163-2340
2018; 8(3): 62-69
doi:10.5923/j.jce.20180803.02
Hassan Ahmadi^{1}, Erfan Razavi^{2}
^{1}Azad University, Roudehen Branch, Assistant Professor Civil Engineering, Iran
^{2}Azad University, Roudehen Branch, MSc Hydraulic Structure and Civil Engineering, Iran
Correspondence to: Erfan Razavi, Azad University, Roudehen Branch, MSc Hydraulic Structure and Civil Engineering, Iran.
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Copyright © 2018 The Author(s). Published by Scientific & Academic Publishing.
This work is licensed under the Creative Commons Attribution International License (CC BY).
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Free surface vortices is considered as one of the problems of the industry in part of flood control (over flow), agriculture, electricity and water supply plants that researchers’ effort in this way represents importance of this issue., it can cause excessive vibration, efficiency loss, structural damage, and also flow reduction in hydro turbines, pumps, Culverts and also can be potential risk and damage factor on the safety of power plants. The most important reasons for using the software FLOW 3D in this thesis is the exact study of intake and making connection between software model and Experimental model. Since software has capability to present velocity distribution in line X Y Z and other hydraulic parameters in point of Critical depth (the first depth into that vortex is not formed). In this thesis presented the Numerical model of horizontal intake with a Plexiglas Reservoir by length and width of 3.1 m and depth of 2.2 m and intake pipes with a radius of 0.3, 0.25, 0.194, 0.144, 0.1, 0.05 m and length of 3 m in determining the required depth of flooding to prevent vortex as software modeling. The results of this study can be used to derive a scrutiny relationship between the depth of flooding in the form of equations of first grade and second grade point. This relationship has been extracted after examining the application output and experimental data in terms of depth flood submergence depth (critical depth), intake diameter, Froude number, the Weber number and Reynolds number.
Keywords: Critical Submergence, Free Vortex, Horizontal intakes, Numerical modelling Include
Cite this paper: Hassan Ahmadi, Erfan Razavi, Determination of Submergence Depth to Avoid Vortices at Horizontal Intake Applying Flow-3D Software, Journal of Civil Engineering Research, Vol. 8 No. 3, 2018, pp. 62-69. doi: 10.5923/j.jce.20180803.02.
Figure 1. Causes of Vortices (Durgin & Hecker 1978) |
Figure 2. Vortex strength scale used by Dargin and Anderson for classification of free surface vortices at intakes |
Figure 3. Numerical Model (perspective view) |
Figure 4. Vortex formation and Critical submergence with coarse mesh |
Figure 5a. Vorticity magnitude contours in Critical submergence depth |
Figure 5b. Vorticity magnitude contours in Critical submergence depth |
Figure 6. Top view of ALİ BAYKARA’s experimental intake |
Figure 7a. Difference between experimental data and numerical values of Sc/Di versus rate of Froude number (Intake pipe diameter=30) |
Figure 7b. Difference between experimental data and numerical values of Sc/Di versus rate of Froude number (Intake pipe diameter=25) |
Figure 7c. Difference between experimental data and numerical values of Sc/Di versus rate of Froude number (Intake pipe diameter=19.4) |
Figure 7d. Difference between experimental data and numerical values of Sc/Di versus rate of Froude number (Intake pipe diameter=14.4) |
Figure 7e. Difference between experimental data and numerical values of Sc/Di versus rate of Froude number (Intake pipe diameter=10) |
Figure 7f. Difference between experimental data and numerical values of Sc/Di versus rate of Froude number |