Performance Investigation of the Immersed Depth Effects on a Water Wheel Using Experimental and Numerical Analyses

被引:7
作者
Zhao, Mengshang [1 ]
Zheng, Yuan [2 ]
Yang, Chunxia [2 ]
Zhang, Yuquan [2 ]
Tang, Qinghong [1 ]
机构
[1] Hohai Univ, Coll Water Conservancy & Hydropower Engn, Nanjing 210098, Peoples R China
[2] Hohai Univ, Coll Energy & Elect Engn, Nanjing 210024, Peoples R China
基金
中国国家自然科学基金;
关键词
water wheel; immersed depth; low and ultra-low heads; free surface; VOF; POWER LOSSES; SIMULATION; TURBINE; FLOW; OVERSHOT; DESIGN; CFD;
D O I
10.3390/w12040982
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
y The purpose of this research is to study the effect of different immersed depths on water wheel performance and flow characteristics using numerical simulations. The results indicate that the simulation methods are consistent with experiments with a maximum error less than 5%. Under the same rotational speeds, the efficiency is much higher and the fluctuation amplitude of the torque is much smaller as the immersed radius ratio increases, and until an immersed radius ratio of 82.76%, the wheel shows the best performance, achieving a maximum efficiency of 18.05% at a tip-speed ratio (TSR) of 0.1984. The average difference in water level increases as the immersed radius ratio increases until 82.76%. The water area is much wider and the water volume fraction shows more intense change at the inlet stage at a deep immersed depth. At an immersed radius ratio of 82.76%, some air intrudes into the water at the inlet stage, coupled with a dramatic change in the water volume fraction that would make the flow more complex. Furthermore, eddies are found to gradually generate in a single flow channel nearly at the same time, except for an immersed depth of 1.2 m. However, eddies generate in two flow channels and can develop initial vortexes earlier than other cases because of the elevation of the upstream water level at an immersed radius ratio of 82.76%.
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页数:17
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