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Journal of Drainage and Irrigation Machinery Engin
 
2017 Vol.35 Issue.7
Published 2017-07-25

article
article
501
2017 Vol. 35 (7): 501- [Abstract] ( 322 ) [HTML 1KB] [ PDF 1745KB] ( 716 )
502
2017 Vol. 35 (7): 502- [Abstract] ( 365 ) [HTML 1KB] [ PDF 985KB] ( 916 )
553 Effect of medium viscosity on performance conversion of pump as turbine
YANG Junhu,, LEI Lei, ZHANG Shuwei, MIAO Senchun,, YAN Jun
In order to study the variation characteristics of performance conversion factors of pump and turbine with viscosity and specific speed, centrifugal pumps with five different specific speeds were chosen as pump and turbine. The flows in the turbines were numerically simulated at five different viscosities. Based on simulated results, the mathematical relationships such as head-flow rate and efficiency-flow rate are obtained with curve fitting. Then the head, efficiency and flow rate are decided at the best efficiency point where the slope of the efficiency curve with respect to flow rate is zero. Eventually, flow rate, head and efficiency conversion factors are calculated based on the flow rate, head and efficiency are at a viscosity higher than water and those at the viscosity of water are at best efficiency points. It is shown that medium viscosity has a greater influence on turbine performance, particularly, the hydraulic efficiency of turbine decreases evidently with increasing viscosity. At the same specific speed, the conversion factors rise with increasing viscosity. At the same viscosity, the conversion factors reduce generally with increasing specific speed. 

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2017 Vol. 35 (7): 553-557 [Abstract] ( 883 ) [HTML 1KB] [ PDF 1544KB] ( 1472 )
558 null
LI Yaohui, ZHU Shuangliang
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2017 Vol. 35 (7): 558-563 [Abstract] ( 954 ) [HTML 1KB] [ PDF 1183KB] ( 1205 )
564 null
WANG Jiabin, WANG Yiyun, YUAN Shouqi, PEI Ji
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2017 Vol. 35 (7): 564-570 [Abstract] ( 911 ) [HTML 1KB] [ PDF 2916KB] ( 1473 )
571 null
JIA Chengli, YANG Congxin, LAN Xiaogang, CHENGXiaorui, XU Biao
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2017 Vol. 35 (7): 571-576 [Abstract] ( 772 ) [HTML 1KB] [ PDF 3357KB] ( 987 )
577 Structure of non-leakage diaphragm of reciprocating hydraulic diaphragm pump for slurry transportation
CHEN Li, CHEN Hongjun, GUAN Ruguang, FU Yihong, ZHANG Shunping
Conventional reciprocating hydraulic diaphragm pumps usually are with a single-layer diaphragm structure to transport slurries. When the diaphragm ruptures, the leaked slurry can contaminate the hydraulic oil and subsequently damage to the hydraulic end components, eventually, increase the user maintenance costs. In order to eliminate this problem, a double-layer diaphragm structure without leakage is developed by studying the working principle of both the pump and the diaphragm and by analyzing the single-layer diaphragm structure, the rupture forms of diaphragm and the causes for rupture. Based on an analysis of design principle and working mechanism of the double-layer diaphragm, the pump with a double-layer diaphragm structure shows no any difference in the performance from the pump with a single-layer diaphragm, but also the drawback of the single-layer diaphragm is removed. A practical application proves that the double-layer diaphragm structure can completely meet the requirements on design under actual working conditions. Thus, such a structure is greatly valuable to study on the reciprocating hydraulic diaphragm pumps for slurry transportation, and also of significance to explore other similar diaphragm structures in a certain degree.

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2017 Vol. 35 (7): 577-580 [Abstract] ( 1080 ) [HTML 1KB] [ PDF 1156KB] ( 1160 )
581 null
LI Jianwei, HONG Zhenguo
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2017 Vol. 35 (7): 581-587 [Abstract] ( 643 ) [HTML 1KB] [ PDF 1710KB] ( 1407 )
588 null
LI Qifei,, LIU Mengmeng, LIU Qian, ZHANG Zhen, ZHANG Jianxun
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2017 Vol. 35 (7): 588-595 [Abstract] ( 823 ) [HTML 1KB] [ PDF 2559KB] ( 1341 )
596 null
CAI Jiumao, LI Li, ZHAI Guoliang, LYU Mouchao, DENG Zhong, XU Rui
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2017 Vol. 35 (7): 596-601 [Abstract] ( 662 ) [HTML 1KB] [ PDF 2280KB] ( 1062 )
602 null
TAN Yongfa, LIU Meihong, KANG Yuchi, WANG Xueliang, LIU Jinbin
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2017 Vol. 35 (7): 602-608 [Abstract] ( 728 ) [HTML 1KB] [ PDF 1400KB] ( 1218 )
609 null
BAI Jiefang,, LI Yangyang,, ZHOU Weibo,
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2017 Vol. 35 (7): 609-615 [Abstract] ( 591 ) [HTML 1KB] [ PDF 12028KB] ( 930 )
616 null
HAO Kun, LIU Xiaogang, HAN Zhihui, YU Ning, WU Jinbo, ZHOU Lin, YANG Qiliang
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2017 Vol. 35 (7): 616-626 [Abstract] ( 610 ) [HTML 1KB] [ PDF 1198KB] ( 931 )
627 null
LI Xiaozhou,, ZHU Manlin,, WANG Xiaomin,, YAN Tianzhu,, WANG Chao,
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2017 Vol. 35 (7): 627-633 [Abstract] ( 757 ) [HTML 1KB] [ PDF 0KB] ( 385 )
634 null
ZHOU Wen,, CAO Lin, WANG Jinhui
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2017 Vol. 35 (7): 634-640 [Abstract] ( 540 ) [HTML 1KB] [ PDF 1230KB] ( 975 )
641 null
LYU Mingli,, ZHANG Zhonghua,, LIU Junping
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2017 Vol. 35 (7): 641-644 [Abstract] ( 624 ) [HTML 1KB] [ PDF 1153KB] ( 1053 )
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主管单位
 江苏省教育厅
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 江苏大学
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 中国农业机械学会排灌机械分会
 国家水泵及系统工程技术研究中心
 中国农业工程学会农业水土工程专业委员会
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徐云峰  张文涛 陈建华
谈国鹏  朱漪云 盛    杰
 

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