动水条件下分离鳃水沙分离效率的分析
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摘要
采用物理模型试验方法,开展了相同含沙量下不同流量的分离鳃和普通管水沙分离效率试验。试验结果表明:动水条件时,分离鳃中也出现了垂向和横向异重流现象;当含沙量为10 kg/m~3时,分离鳃在浑水进口流量为0.3、0.5、0.7、0.9、1.1 m~3/h条件下,水沙分离效率是普通管的1.03～2.26、1.16～2.45、1.30～2.70、1.58～3.85、1.65～1.60倍;分离鳃的最佳浑水进口流量为0.9 m~3/h,水沙分离效率可达34.12%,耗水率为5.78%;浑水进口流量为0.3～0.9m~3/h时,分离鳃水沙分离效率随时间的变化可分成缓慢增加、快速增加、缓慢增加3个阶段,而浑水进口流量为1.10m~3/h时仅有缓慢增加阶段。
The physical model test method was used to test the water-sand separation efficiency of gill-piece separation device( GPSD) and common pipe under the same sediment concentration and different flow rates. The experimental results show that the vertical and horizontal heterogravity flow also occurs in GPSD under the condition of moving water. When the sediment content is 10 kg/m~3,the separation efficiency of GPSD is 1.03 ～ 2.26,1.16 ～ 2.45,1.30 ～ 2.70,1.58 ～ 3.85,1.65 ～ 1.60 times of that of the common pipe under the conditions of0.3,0.5,0.7,0.9 and 1.1 m~3/h of the inlet flow of muddy water. The optimal muddy water inlet flow rate of GPSD is 0.9 m~3/h,the water-sand separation efficiency can reach 34.12%,and the water consumption rate is 5.78%.When the inlet flow of muddy water is 0.3 ～ 0.9 m/h,the separation efficiency of water and sediment with time can be divided into three stages of slow increase,fast increase and slow increase,while when the inlet flow of muddy water is 1.10 m~3/h,there is only a slow increase stage.
The physical model test method was used to test the water-sand separation efficiency of gill-piece separation device( GPSD) and common pipe under the same sediment concentration and different flow rates. The experimental results show that the vertical and horizontal heterogravity flow also occurs in GPSD under the condition of moving water. When the sediment content is 10 kg/m~3,the separation efficiency of GPSD is 1.03 ～ 2.26,1.16 ～ 2.45,1.30 ～ 2.70,1.58 ～ 3.85,1.65 ～ 1.60 times of that of the common pipe under the conditions of0.3,0.5,0.7,0.9 and 1.1 m~3/h of the inlet flow of muddy water. The optimal muddy water inlet flow rate of GPSD is 0.9 m~3/h,the water-sand separation efficiency can reach 34.12%,and the water consumption rate is 5.78%.When the inlet flow of muddy water is 0.3 ～ 0.9 m/h,the separation efficiency of water and sediment with time can be divided into three stages of slow increase,fast increase and slow increase,while when the inlet flow of muddy water is 1.10 m~3/h,there is only a slow increase stage.
引文
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[2]孙步功,龚俊,辛舟,等.滴灌用黄河水泥沙分离试验研究[J].农业工程学报,2008,24(8):51-53.
[3]孙步功,吴建民,赵武云,等.串联分离滴灌用黄河水试验研究[J].灌溉排水学报,2009,28(5):106-108.
[4]邱秀云,龚守远,严跃成,等.一种新型水沙分离装置的研究[J].新疆农业大学学报,2007,30(1):68-70.
[5]朱超,邱秀云.垂向异重流式分离鳃适用泥沙的试验研究[J].人民长江,2009,40(5):60-61.
[6]朱超,邱秀云,孙鑫.分离鳃鳃片倾角对水沙分离影响的试验研究[J].人民黄河,2009,31(10):86-87.
[7]朱超,邱秀云,严跃成.垂向异重流式水沙分离鳃水沙分离机理浅析[J].水利水电科技进展,2009,29(5):20-23.
[8]朱超.水沙分离鳃结构优化及分离机理试验研究[D].乌鲁木齐:新疆农业大学,2009.
[9]朱超,邱秀云,刘艳.垂向异重流式水沙分离鳃鳃片型式对水沙分离的影响研究[J].新疆农业大学学报,2008,31(6):72-75.
[10]严跃成,邱秀云,张翔,等.两相流分离鳃泥沙下沉通道宽度对水沙分离影响的试验研究[J].新疆农业大学学报,2011,34(6):526-528.
[11]严跃成,邱秀云,张翔,等.两相流分离鳃泥沙运动轨迹及加速滑移的力学分析[J].水利水电科技进展,2011,31(5):27-29.
[12]赵丽娜,邱秀云,陈铂,等.两相流水沙分离鳃流场的PIV测试及分析[J].新疆农业大学学报,2012,35(2):144-148.
[13]陶洪飞,邱秀云,李卫鹏,等.分离鳃最优鳃片间距的静水沉降试验[J].水利水电科技进展,2013(4):49-53.
[14]陶洪飞,邱秀云,何照青,等.含沙量对分离鳃的水沙分离影响试验[J].水电能源科学,2013(7):93-95.
[15]罗菲,邱秀云,李琳.单鳃片分离鳃固液两相流流场三维数值模拟[J].新疆农业大学学报,2011,34(3):253-258.
[16]陶洪飞,邱秀云,李巧,等.不同鳃片间距下的分离鳃内部流场三维数值模拟[J].农业机械学报,2014,45(6):183-189.
[17]陶洪飞,邱秀云,李巧,等.不同鳃片倾斜角下的分离鳃内部流场三维数值模拟[J].水电能源科学,2015(1):157-161.
[18]陶洪飞,邱秀云,赵丽娜,等.水沙分离鳃内部流场的数值模拟[J].农业工程学报,2013,29(17):38-46.
[19]陶洪飞,邱秀云,王苗.基于数值模拟的分离鳃水沙分离效率及机理分析[J].节水灌溉,2015(2):66-71.
[20]陶洪飞,邱秀云,李巧,等.不同泥沙粒径下的分离鳃内部流场三维数值模拟[J].水利水电科技进展,2014,34(5):17-23.
[21]上海市政工程设计研究院.给排水设计手册(第3册):城市给水[M].北京:中国建筑工业出版社,2004:477-546.
[22] Kranenburg C. Effects of floc strength on viscosity and deposition of cohesive sediment suspensions[J]. Continental Shelf Research,1999,19(13):1 665-1 680.
[23] Kranenburg C. The fractal structure of cohesive sediment aggregates[J]. Estuarine Coastal&Shelf Science,1994,39(6):451-460.