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| DOI：10.13522/j.cnki.ggps.20190174 |
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| Anti-clogging Performance Analysis and Structure Optimization Simulation for Dental Labyrinth Emitter |
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YANG Bin, WU Yong, WANG Jiandong, MA Xiaopeng, WANG Haitao, ZHANG Yanqun, MO Yan
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1. Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research， 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;4.Institute of Soil Fertilizer and Agricultural Water Saving, Xinjiang Academy of Agricultural Sciences，Urumqi 830091, China
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| Abstract: |
| 【Objective】The aim of this paper is to clarify the causes of the internal flow characteristics of the physical clogging in dental labyrinth emitter, and put forward the optimum parameters of the emitter with high anti-clogging performance. 【Method】Based on Workbench platform in CFD software, the water-sand two-phase flow characteristics in internal flow field were computed for five different dental labyrinth emitters with different dental flow channel, and the differences of flow velocity, turbulent kinetic energy, turbulent dissipation rate and physical particle trajectory under different dental structures were analyzed. 【Result】Based on numerical simulation analysis, an improved scheme of optimizing the structure of the dental labyrinth emitter was proposed, and the optimized dental structure increased the area of the low-speed region and the turbulent kinetic energy of the low-speed region in the flow passage, and the range of turbulent kinetic energy was increased by 52%~200% compared with the other four dental structures, and the optimized dental structure increased the particle transport velocity, and reduced the transport distance and retention time of the particle, which improved the anti-clogging performance of dental labyrinth emitter. 【Conclusion】The anti-clogging performance of the dental labyrinth emitter is closely related to the fluid velocity in the low velocity zone in the flow channel and the turbulent kinetic energy in the flow passage. Areas with high flow rates and turbulent energy are less likely to be clogging. The maximum value of turbulent kinetic energy appears in the mainstream and reaches the maximum value at the water-facing area in the flow passage. The turbulent dissipation rate has similar distribution rules with turbulent kinetic energy, and the region with the most turbulent kinetic energy dissipation is located at the tip of the teeth. The dental structure plays a key role in the energy dissipation effect. |
| Key words: dental labyrinth emitter；anti-clogging performance；turbulent kinetic energy；structure optimization; turbulent dissipation rate |
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