排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2018, Vol. 36 Issue (9): 845-850    DOI: 10.3969/j.issn.1674-8530.18.1015
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Numerically simulated effects of entry on hydraulic performance of hydro-turbine in hose reel irrigators
CHEN Weisheng1, LI Yaojun1*, YAN Haijun1, ZHANG Mingzhen2
1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Hebei Shangshui irrigation equipment Co. Ltd., Shijiazhuang, Hebei 050051, China
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Abstract Turbulent flows in two hydro-turbines of hose reel irrigator respectively with two entries, i.e. nozzle and spiral case, were investigated numerically using SST k-ω turbulence model to uncover the differences between internal flow field characteristics and hydraulic performance caused by two different kinds of entries. The predicted hydraulic performance of the turbine with nozzle was validated with the corresponding experimental data available. It is indicated that large scale vortex and strong leakage flow cross the blade side tip clearance existes in the impeller of the turbine with nozzle entry. For the turbine with spiral entry, the pressure and streamlines inside the impeller are distributed relatively uniformly, no significant difference in the leakage flow pattern along the circumferential direction is noticed. It is found that the percentage of each component hydraulic loss to the total hydraulic loss across the turbine with nozzle remains constant basically at various flow rates, especially, the hydraulic loss in the impeller accounts for 55% of the total hydraulic loss. For the turbine with spiral case, the hydraulic loss in each component varies with flow rate. The performance curves of two turbines show nearly the same variation tendency, but the efficiency of the turbine with spiral case is 18%-22% higher than that of the turbine with nozzle at the same flow rate, especially the best efficiency of the former is 59.6% in comparison with 35.6% of the latter. These results can provide a reference for hydraulic design and structural improvement of hydro-turbine in hose reel irrigators. 
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Articles by authors
CHEN Wei-Sheng-
LI Yao-Jun-*
YAN Hai-Jun-
ZHANG Ming-Zhen-
Key wordshose reel irrigation   water turbine   inflow mode   hydraulic performance   numerical simulation     
Received: 2018-03-31;
Cite this article:   
CHEN Wei-Sheng-,LI Yao-Jun-*,YAN Hai-Jun- et al. Numerically simulated effects of entry on hydraulic performance of hydro-turbine in hose reel irrigators[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 845-850.
 
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