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| DOI：10.13522/j.cnki.ggps.20180497 |
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| Numerical Simulation of Hydraulic Performance of Tooth-form Channel of Labyrinth Emitter |
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YANG Bin, ZHANG Geng, WANG Jiandong, GONG Shihong, WANG Haitao, MO Yan
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1. China Institute of Water Resource and Hydraulic Research, Department of Irrigation and Drainage, Beijing 100048, China；2. National Agricultural Technology extension Service Center, Beijing 100125, China; 3. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| 【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. |
| Key words: dental emitter; structural parameters; numerical simulation; hydraulic performance |
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