| 引用本文: | 高振军,司长青,丁小明,等.侧通风窗纵横比对连栋温室流场均匀性的影响[J].灌溉排水学报,0,():-. |
| gaozhenjun,sichangqing,dingxiaoming,et al.侧通风窗纵横比对连栋温室流场均匀性的影响[J].灌溉排水学报,0,():-. |
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| 侧通风窗纵横比对连栋温室流场均匀性的影响 |
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高振军1, 司长青1, 丁小明2, 李苇3, 李浩4, 何芬2, 李文杨1, 张建波1
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1.三峡大学;2.农业农村部规划设计研究院;3.广东省现代农业装备研究所;4.中国农业科学院农田灌溉研究所/河南省节水农业重点实验室
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| 摘要: |
| 探究侧通风窗纵横比大小对连栋温室内流场均匀性的影响，为温室设计建造提供理论依据。【方法】本研究以广州地区连栋蝶形开窗温室为研究对象，采用数值模拟和试验结合的方法，研究不同开窗纵横比下连栋温室内流场的分布规律。试验温室开窗纵横比为1，开窗尺寸为1.2 m×1.2 m，通风窗底部高度为2m。本研究设计了4种不同开窗纵横比方案并与试验温室（即开窗方案C）进行对比，引入不均匀系数评价流场均匀性，研究不同开窗纵横比下连栋温室内流场的分布规律。试验温室开窗纵横比为1，开窗尺寸为1.2 m×1.2 m，通风窗底部高度为2m。【结果】通过实测值和模拟值对比，温度、风速的平均误差分别为2.48%和8.76%，均方根误差分别为1.10℃和2.1\times{10}^{-3}m/s，各测点气温的实测值与模拟值相对误差范围在0.09%~5.31%，平均误差为2.48%，均方根误差为1.10，验证了模型的有效性各测点气温的实测值与模拟值相对误差范围在0.09%~5.31%，平均误差为2.48%，均方根误差为1.10，验证了模型的有效性；不同开窗纵横比对连栋温室室内平均温度无显著影响，但对温度不均匀系数存在明显差异，其中开窗方案A较开窗方案C总体温度不均匀系数减少了41%;5种开窗方案中，开窗方案A的总体平均风速和风速不均匀系数均优于其他开窗方式，与开窗方案C相比，平均风速提高了23%，风速不均匀系数降低了41%。【结论】从温室内流场分布角度来看，适当降低侧通风窗纵横比，能够有效降低温度、风速不均匀程度。 |
| 关键词: 连栋温室；纵横比；自然通风；数值模拟 |
| DOI： |
| 分类号:S625.1 |
| 基金项目:“十三五”国家重点研发计划(2017YFD0701500)；农业农村部农业设施结构工程重点实验室开放课题(201903) |
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| Influence of Aspect Ratio of Side Ventilation Window on Uniformity of Flow Field in Multi-span Greenhouse |
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gaozhenjun,sichangqing,dingxiaoming,et al
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1.China Three Gorges University;2.Academy of Agricultural Planning and Engineering;3.Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences/Key Laboratory of Water-Saving Agriculture of Henan Province
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| Abstract: |
| 【Objective】The effect of the aspect ratio of the side ventilation window on the uniformity of the flow field in the multi-span greenhouse was investigated to provide a theoretical basis for the design and construction of the greenhouse.【Method】 This study took the multi-span butterfly window greenhouse in Guangzhou as the research object, and used the method of combining numerical simulation and experiment to study the distribution law of the flow field in the multi-span greenhouse under different window aspect ratios. The aspect ratio of the windows of the experimental greenhouse is 1, the size of the windows is 1.2m × 1.2m, and the height of the bottom of the ventilation windows is 2m. In this study, four different windowing aspect ratio schemes were designed and compared with the experimental greenhouse (ie, the windowing scheme C).【Result】The relative error range between the measured value and the simulated value of the temperature at each measuring point is 0.09%~5.31%, the average error is 2.48%, and the root mean square error is 1.10, which verifies the validity of the model; Different aspect ratios of window openings have no significant effect on the average indoor temperature of the multi-span greenhouse, but there are significant differences in the temperature unevenness coefficient. The overall temperature unevenness coefficient of window opening scheme A is reduced by 41% compared with window opening scheme C; Among the five window opening schemes, the overall average wind speed and wind speed non-uniformity coefficient of window opening scheme A are better than other window opening methods. Compared with window opening scheme C, the average wind speed is increased by 23%, and the wind speed non-uniformity coefficient is reduced by 41%. 【Conclusion】From the perspective of the flow field distribution in the greenhouse, appropriately reducing the aspect ratio of the side ventilation windows can effectively reduce the unevenness of temperature and wind speed. |
| Key words: multi-span greenhouse; aspect ratio; natural ventilation; numerical simulation |
