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Study on Simulation Analysis of Reduce Speed Effect for Wind Nets in Front of Crop
( Cheng-chang Lien ),( Zhu-yun Yeh ),( Wei-ling Sun ),( Jeng-liang Lin ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Due to frequent strong winds from its geographical location in Taiwan, which caused serious damage to vegetables and fruit trees, leading to a large loss of agricultural production. Wind nets can be used to reduce the wind speed in front of fruits and vegetables in order to reduce the impact of wind speed. The purpose of this study is to use Computational Fluid Dynamics(CFD), CFD simulation Software was used to simulate wind tunnel experiments with wind nets before fruits and vegetables to understand the wind tunnel with different ventilation rates under certain wind speed 40 m/s, to simulate the change of wind speed and the distribution of flow field behind the wind nets, Analyze and analyze the change of wind field and the effect of reducing the wind. The size of the wind net was 12m<sup>*</sup>6m. According to the CFD simulation results, when the strong wind blows through the wind nets, a negative pressure zone will be generated at a horizontal distance of 0h to 10h in the windshield leeway, and the height of the negative pressure zone will gradually decrease as the horizontal distance increases. The height of the negative pressure zone also decreases with the increase of the ventilation rate of the windbreak. In addition, the analysis results show that the ventilation rate of 40% of the windbreak, the negative pressure vortex gradually disappear, and have the best effect of reducing the wind.
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