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| Numerical simulation and experimental of optimum hydraulic design for elbow inlet passage |
| ZHANG Chi1, LI Yanjun1, JIANG Hongyin2, YUAN Jianping1 |
| 1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Jiangsu Province Water Engineering Sci-tech Consulting Co., Ltd., Nanjing, Jiangsu 210000, China |
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Abstract In order to analyze the relationship between pumping station engineering excavated volume of elbow inlet passage and hydraulic loss of passage, the inlet passage was designed. The 8 schemes of elbow inlet passage were designed. In examples 1-4, the floor tilt angle of the passage was different(in example 1, floor tilt angle was 0°). In examples 5-8, the radius of backward wall of the passage bending section was different. Based on the Reynolds averaged N-S equation, standard turbulent model and SIMPLEC algorithm, the 3-D flow field in 8 examples of elbow inlet passages was simulated in rated flow. The simulation results show that in examples 1-4, the floor tilt angle was raised. When the floor tilt angle was 7°, hydraulic loss of the passage increased slightly and the imported floor height of the passage was 1.15 m higher than that in example 1; the floor tilt angle continues to increase and hydraulic loss increased obviously. In examples 5-8, the radius of backward wall of the passage bending section decreased continuously. When the R was 1.03 times longer than impeller diameter, hydraulic loss was 14.5 mm higher than that in example 1(hydraulic loss was measured by height of the water column)and the floor height of the passage was 0.36 m higher than that in example 1. If the R continues to decrease, hydraulic loss increased obviously. The model test for the preferred example of floor tilt angle 7° was conducted. The results were basically in agreement with calculated results.
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Received: 17 November 2015
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