齿型迷宫流道灌水器水力性能数值模拟研究
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摘要
【目的】定量探究流道结构参数与灌水器水力性能之间的互馈关系。【方法】研究齿角度(a)、齿底距(b)、齿高度(c)和流道深度(d)4个关键因素,选用L18(37)正交试验设计方案,通过室内测试与数值模拟,定量分析了流道结构参数对其水力性能的影响。【结果】采用四面体含边界层网格或混合多面体网格的模拟精度最高,采用标准k-ε计算模型,流量偏差率可控制在6.00%的误差范围内,可推荐作为齿型流道结构灌水器数值模拟时的参考设置模式;按显著性水平α=0.1检验,流道深度和齿高度对流态指数存在显著影响;此外,研究构建了流态指数与齿型灌水器关键结构参数之间的定量多元线性回归方程为;X=4.67×10-4a-0.005 4b-0.016 1c+0.041 7d+0.442 2,流量系数的回归方程为:K=0.211 1a+2.822 4b+1.796 5c+8.247 8d-11.584 9。【结论】齿型流道结构滴头的网格划分宜采用四面体含边界层网格或混合多面体网格型式,且流态指数和流量系数与齿型灌水器关键结构参数之间的关系可以通过多元线性回归方程表示。
【Objective】The aim of the paper is to quantify the relationship between channel structure parameters and hydraulic performance of labyrinth emitter.【Method】Four factors, including dentation angle, bottom space between the dentations, dentation height and depth of flow passage were selected for the orthogonal experiment arrangement. Based on laboratory test and numerical simulation, we elucidated the influence of structure parameters on the hydraulic performance.【Result】Tetrahedral mesh with boundary layer mesh and mixing polyhedral mesh was most accurate. The error of simulated flow rate could be controlled around 6.00% using the standard k-ε model. Both depth of flow passage and the dentation height had significant influence on emitter discharge exponent(α=0.1). We derived regression models to describe the relationship between emitter discharge exponent and structural parameters of the flow passage, as well as the relationship between the discharge coefficient and structural parameters of flow passage.【Conclusion】This study determined the meshing pattern of the emitter and established the relationship between the structural parameters of the flow channel and its hydraulic performance.
【Objective】The aim of the paper is to quantify the relationship between channel structure parameters and hydraulic performance of labyrinth emitter.【Method】Four factors, including dentation angle, bottom space between the dentations, dentation height and depth of flow passage were selected for the orthogonal experiment arrangement. Based on laboratory test and numerical simulation, we elucidated the influence of structure parameters on the hydraulic performance.【Result】Tetrahedral mesh with boundary layer mesh and mixing polyhedral mesh was most accurate. The error of simulated flow rate could be controlled around 6.00% using the standard k-ε model. Both depth of flow passage and the dentation height had significant influence on emitter discharge exponent(α=0.1). We derived regression models to describe the relationship between emitter discharge exponent and structural parameters of the flow passage, as well as the relationship between the discharge coefficient and structural parameters of flow passage.【Conclusion】This study determined the meshing pattern of the emitter and established the relationship between the structural parameters of the flow channel and its hydraulic performance.
引文
[1]任改萍,吴普特,朱德兰,等.泥沙粒径对大流道迷宫灌水器堵塞影响研究[J].灌溉排水学报,2016,35(3):1-6.
[2]国攀,张毅杰,宋时雨,等.地下滴灌灌水器负压吸泥影响因素试验研究[J].灌溉排水学报,2017,36(1):63-68.
[3]金龙,李治勤,马炎超,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.
[4]喻黎明.灌水器流道结构参数与水力性能关系[J].长沙理工大学学报(自然科学版),2011,8(1):30-35.
[5]ZHANG J,ZHAO W,WEI Z,et al.Numerical and experimental study on hydraulic performance of emitters with arc labyrinth channels[J].Computers&Electronics in Agriculture,2007,56(2):120-129.
[6]潘雅阁.齿形流道结构对滴头水力性能影响的试验研究[D].杨凌:西北农林科技大学,2017.
[7]ALAMOUD A I,MATTAR M A,ATEIA M I.Impact of water temperature and structural parameters on the hydraulic labyrinth-channel emitter perfor mance[J].Spanish Journal of Agricultural Research,2014,12(3):580-593.
[8]张丽娟,李双营.滴灌齿型迷宫流道灌水器水力性能数值试验研究[J].水电能源科学,2017,10(8):103-106.
[9]王新坤,李俊红,李亚飞,等.基于正交试验的三角环流流道灌水器数值模拟[J].排灌机械工程学报,2010,28(5):444-448.
[10]郭霖,白丹,程鹏,等.三角形迷宫流道滴灌灌水器结构参数及水力特性研究[J].中国水能及电气化,2011(10):23-27.
[11]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.
[12]陈雪,吴普特,范兴科,等.灌水器迷宫流道结构参数数值模拟与抗堵塞分析[J].灌溉排水学报,2008,27(2):35-38.
[13]王建东,李光永,邱象玉,等.流道结构形式对灌水器水力性能影响的试验研究[J].农业工程学报,2005,21(z1):100-103.
[14]喻黎明,吴普特,牛文全.迷宫流道偏差量对灌水器水力性能及抗堵塞性能的影响[J].农业机械学报,2011,42(9):64-68.
[15]王建东,龚时宏,李光永,等.低压下流道结构参数对锯齿型滴头水力性能影响的试验研究[J].水利学报,2014,45(1):72-78.
[2]国攀,张毅杰,宋时雨,等.地下滴灌灌水器负压吸泥影响因素试验研究[J].灌溉排水学报,2017,36(1):63-68.
[3]金龙,李治勤,马炎超,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.
[4]喻黎明.灌水器流道结构参数与水力性能关系[J].长沙理工大学学报(自然科学版),2011,8(1):30-35.
[5]ZHANG J,ZHAO W,WEI Z,et al.Numerical and experimental study on hydraulic performance of emitters with arc labyrinth channels[J].Computers&Electronics in Agriculture,2007,56(2):120-129.
[6]潘雅阁.齿形流道结构对滴头水力性能影响的试验研究[D].杨凌:西北农林科技大学,2017.
[7]ALAMOUD A I,MATTAR M A,ATEIA M I.Impact of water temperature and structural parameters on the hydraulic labyrinth-channel emitter perfor mance[J].Spanish Journal of Agricultural Research,2014,12(3):580-593.
[8]张丽娟,李双营.滴灌齿型迷宫流道灌水器水力性能数值试验研究[J].水电能源科学,2017,10(8):103-106.
[9]王新坤,李俊红,李亚飞,等.基于正交试验的三角环流流道灌水器数值模拟[J].排灌机械工程学报,2010,28(5):444-448.
[10]郭霖,白丹,程鹏,等.三角形迷宫流道滴灌灌水器结构参数及水力特性研究[J].中国水能及电气化,2011(10):23-27.
[11]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.
[12]陈雪,吴普特,范兴科,等.灌水器迷宫流道结构参数数值模拟与抗堵塞分析[J].灌溉排水学报,2008,27(2):35-38.
[13]王建东,李光永,邱象玉,等.流道结构形式对灌水器水力性能影响的试验研究[J].农业工程学报,2005,21(z1):100-103.
[14]喻黎明,吴普特,牛文全.迷宫流道偏差量对灌水器水力性能及抗堵塞性能的影响[J].农业机械学报,2011,42(9):64-68.
[15]王建东,龚时宏,李光永,等.低压下流道结构参数对锯齿型滴头水力性能影响的试验研究[J].水利学报,2014,45(1):72-78.