| 摘要: |
| 针对西北地区卷帘牛舍冬季地面结冰，造成奶牛行走不便、打滑、跪地甚至伤害牛蹄、乳头，以及无法使机械刮粪系统正常作业，影响舍内卫生等问题，采用计算流体力学的方法，模拟该地区6组矮墙设计方式下卷帘牛舍地面温度场的分布，并对其中3组进行现场试验验证。结果表明，不同矮墙高度和外保温方式对矮墙附近的地面温度场有很大影响：1）矮墙高度对地面温度的影响程度大于墙体保温措施的应用，矮墙高度由0.5 m增加到1.5 m时，距矮墙2 m范围内的地面温度可提高1.0 ℃；2）矮墙高度与墙体保温具有交互效应，采用1.2 m矮墙加外保温时与1.4 m矮墙无外保温时的地面温度基本相同，综合考虑矮墙高度和设置保温层对夏季通风和建造成本的影响，建议采用1.2 m矮墙加外保温设计。 |
| 关键词: 卷帘牛舍 地面温度模拟 牛舍矮墙设计 模拟验证 |
| DOI：10.11841/j.issn.1007-4333.2017.06.18 |
| 投稿时间：2016-06-03 |
| 基金项目:现代农业（奶牛）产业技术体系建设专项资金资助（CARS-37）；公益性行业（农业）专项（201303091） |
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| Numerical simulation of curtain barn's low-wall affecting the surface temperature of internal clearance channel |
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WU Hanping1,2, SHI Zhengxiang1,2, YUAN Xiaoyan1,2
|
| (1.Key Laboratory of Agricultural Engineering in Structure and Environment, China Agricultural University, Beijing 100083, China;2.The Livestock and Poultry Healthy Aquaculture Environmental Engineering Technology Research Center, China Agricultural University, Beijing 100083, China) |
| Abstract: |
| Aiming at the problems cause by the frozen ground of curtain cowshed in winter at the Northwest of China,i.e.cows walking-impaired,skidding,and kneeling,damage of cows hoof and nipples,and un-normal operation of mechanical scraping manure systems affecting barn environment and other issues.adopts Computational Fluid Dynamics method was adopted in this study,Simulations of the three distribution of ground temperature fields in cowshed with different low-wall were conducted,and the results were in a good agreement with field test.The results showed that the height of the wall and external wall insulation had great influence on the ground temperature field which close to low-wall.1) The influent degree of low wall height on the ground temperature is greater than the wall heat preservation measures of application.When low wall height was increased from 0.5 m to 1.5 m,within 2 m of the low-wall,ground temperature was increased by 1.0 ℃;2) The low-wall height and wall insulation displayed interaction effect,and the ground temperature of 1.2 m height low-wall with exterior insulation was same with 1.4 m height low-wall without exterior insulation.In conclusion,considering the low altitude,the ventilated thermal insulation layer of summer,the influence of the construction cost,1.2 m height low-wall with external insulation design was recommended. |
| Key words: curtain barn the ground temperature simulation low-wall design model validation |
