| PERFORMANCE EVALUATION OF SUBMERGENCE RATIO OF A RECTANGULAR SUBMERGED VANE WITH A COLLAR |
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| 作者姓名： | Umesh P. GUPTA Nayan SHARMA C. S. P. OJHA |
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| 作者单位： | Morphology Directorate Central Water Commission New Delhi (India) Dr.，WRDTC Indian Institute of Technology Roorkee (India) Prof.，Indian Institute of Technology Roorkee (India)，Prof. Civil Engg. Dept. |
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| 摘 要： | 1 INTRODUCTION Odgaard and Kennedy (1983) suggested that for values of angle of attack, α greater than or equal to approximately 20o, a persistent scour hole is produced near the upstream end of a vane. As α was reduced the number of vanes producing obj…
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| 关 键 词： | 运量 泥沙 沉没度 流速 MOM |
| 收稿时间： | 2004-09 |
| 修稿时间： | 2004-12 |
PERFORMANCE EVALUATION OF SUBMERGENCE RATIO OF A RECTANGULAR SUBMERGED VANE WITH A COLLAR |
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| Umesh P. GUPTA,Nayan SHARMA,C. S. P. OJHA.PERFORMANCE EVALUATION OF SUBMERGENCE RATIO OF A RECTANGULAR SUBMERGED VANE WITH A COLLAR[J].International Journal of Sediment Research,2006,21(1):42-49. |
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| Authors: | Umesh P GUPTA Nayan SHARMA C S P OJHA |
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| Abstract: | The vane induced strength of secondary flow in terms of dimensionless moment of momentum is maximum in the case of a rectangular vane with a collar at angle of attack 400 at different degrees of submergence (T/d) such as 0.60, 0.67 and 0.75. The same value of optimal angle of attack was found by Marelius and Sinha (1998) in the case of a rectangular vane without a collar. The vane induced strength of a vortex is insensitive to the submergence ratio (T/d). The vane induced strength of a vortex in terms of moment of momentum (MOM) depends on a wide range of variables, such as angle of attack, vane height, vane length, vane thickness flow depth, water density, median sediment size, velocity vector, acceleration due to gravity, water dynamic viscosity,vane shape, taper angle, etc. The optimal angle of attack is very close to 40°. A dimensionless moment of momentum parameter has also been identified. Vane induced secondary flow is also related to linear momentum. The graphical plot of moment of momentum vs. different angle of attack shows a similar trend as that of the plot of dimensionless MOM such as MOM made nondimensional by flow depth or by vane height vs. angle of attack. |
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| Keywords: | Vane Secondary flow Moment of momentum Optimal angle of attack Submergence ratio Dimensionless moment of momentum Linear Momentum |
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