基于正交试验的双内齿迷宫灌水器数值模拟
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摘要
在普通矩形迷宫流道灌水器的竖向流道与横向流道分别加入2个、1个内齿,构成4种内齿相对位置不同的双内齿矩形迷宫流道灌水器,并保持两者最小过流断面一致,以此探求加入内齿前、后迷宫流道灌水器水力性能的优劣,并采用数值模拟及正交试验的方法,选取内齿相对位置、内齿间距、内齿高度为主要因素,选取L_(16)(4~5)正交表得到16组方案,通过方差分析与极差分析的方法,找到影响其水力性能的主要因素与次要因素,最终得到最优方案组合。结果表明:在普通矩形迷宫流道加入内齿后,其消能效果更好,流态指数减小11.18%～18.01%;影响双内齿矩形迷宫流道的3个因素的主次顺序为内齿相对位置、内齿高度、内齿间距;双内齿矩形迷宫流道灌水器的流态指数最小的结构为竖向流道左上侧与右下侧、横向无涡处加入内齿,内齿间距0.5 mm,内齿高0.9 mm,其流态指数为0.500 6。
Comparing to ordinary rectangular labyrinth, the vertical channel was added two internal tooth and transverse channel was added one internal tooth respectively for forming four double inner teeth rectangular labyrinth channels with different position of inner tooth. The ordinary rectangular labyrinth channels and teeth double inner teeth rectangular labyrinth channels had the same minimum flow cross section, in order to study the hydraulic performance all of them. And the method of numerical simulation and orthogonal test were used to select the primary factors of inner tooth spacing, relative position and tooth height. Through variance analysis and range analysis, the main factors and secondary factors affecting the hydraulic performance were found. Finally the optimal scheme was got. The results show that in the ordinary rectangular labyrinth with internal tooth, the effect of energy dissipation will be better and the flow index generally decreases from 11.18% to 18.01%; three factors' influencing order of double inner tooth rectangle labyrinth channel is that the relative position of inner tooth > inner tooth height > the inner tooth spacing; the structure of double inner tooth rectangular labyrinth channel with the minimum flow index is that the left upper side and right lower side in vertical flow and the side without vortex in transverse vortex adds inner tooth. The tooth spacing is 0.5 mm, tooth height is 0.9 mm and the flow index is 0.500 6.
Comparing to ordinary rectangular labyrinth, the vertical channel was added two internal tooth and transverse channel was added one internal tooth respectively for forming four double inner teeth rectangular labyrinth channels with different position of inner tooth. The ordinary rectangular labyrinth channels and teeth double inner teeth rectangular labyrinth channels had the same minimum flow cross section, in order to study the hydraulic performance all of them. And the method of numerical simulation and orthogonal test were used to select the primary factors of inner tooth spacing, relative position and tooth height. Through variance analysis and range analysis, the main factors and secondary factors affecting the hydraulic performance were found. Finally the optimal scheme was got. The results show that in the ordinary rectangular labyrinth with internal tooth, the effect of energy dissipation will be better and the flow index generally decreases from 11.18% to 18.01%; three factors' influencing order of double inner tooth rectangle labyrinth channel is that the relative position of inner tooth > inner tooth height > the inner tooth spacing; the structure of double inner tooth rectangular labyrinth channel with the minimum flow index is that the left upper side and right lower side in vertical flow and the side without vortex in transverse vortex adds inner tooth. The tooth spacing is 0.5 mm, tooth height is 0.9 mm and the flow index is 0.500 6.
引文
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[12] 袁建平,李淑娟,付跃登.用正交试验研究分流叶片对离心泵性能的影响[J].排灌机械,2009,27(5):306-309.
[13] 张俊,洪军,赵万华,等.基于正交试验的迷宫流道灌水器参数化设计研究[J].西安交通大学学报,2006,40(1):31-35.
[2] 常莹华,牛文全,王维娟.滴灌灌水器迷宫流道的内部流体数值模拟与流动分析[J].西北农林科技大学学报(自然科学版),2009,37(2):203-208.
[3] 郭霖,白丹,程鹏,等.滴灌灌水器三角形迷宫流道优化设计[J].排灌机械工程学报,2015,33(7):634-639.
[4] 王芳,吴普特,范兴科.滴灌灌水器迷宫流道数值模拟与结构优化设计[J].灌溉排水学报,2007,26(3):35-37.
[5] 王建东.滴头水力性能与抗堵塞性能试验研究[D].北京:中国农业大学,2004:20-28.
[6] 金龙,李治勤,马彦超,等.双内齿矩形迷宫流道灌水器水力特性分析[J].太原理工大学学报,2016,47(6):774-778.
[7] 刘瑞江,张业旺,闻崇炜,等.正交试验设计和分析方法研究[J].试验技术与理论,2010(9):52-55.
[8] 魏正英,唐一平,赵万华,等.滴灌灌水器迷宫流道结构与水力性能试验研究[J].农业工程学报,2005,36(12):51-55.
[9] 王福军.计算流体动力学分析:CFD软件原理与应用[M].北京:清华大学出版社,2004:111-123.
[10] 李云开,杨培岭,吴显斌,等.重力滴灌灌水器水力性能及其流道内流体流动机理[J].农业机械学报,2005,10(36):54-57.
[11] 朱勇华,部淑彩,孙锡玉.应用数理统计[M].武汉:武汉水利电力大学出版社,1998:210-260.
[12] 袁建平,李淑娟,付跃登.用正交试验研究分流叶片对离心泵性能的影响[J].排灌机械,2009,27(5):306-309.
[13] 张俊,洪军,赵万华,等.基于正交试验的迷宫流道灌水器参数化设计研究[J].西安交通大学学报,2006,40(1):31-35.
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