| 农户用机械通风钢网式小麦干燥储藏仓的气流场分析 |
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| 引用本文： | 刘立意,汪雨晴,赵德岩,王旭光,娄正,柳芳久.农户用机械通风钢网式小麦干燥储藏仓的气流场分析[J].农业工程学报,2020,36(2):312-319. |
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| 作者姓名： | 刘立意 汪雨晴 赵德岩 王旭光 娄正 柳芳久 |
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| 作者单位： | 东北农业大学工程学院,哈尔滨,150030;农业农村部规划设计研究院,北京,100125;黑龙江中良仓储技术工程有限公司,哈尔滨,150008 |
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| 基金项目： | 公益性行业（农业）科研专项（201003077）；国家重点研发计划子课题（2017YFD0401405-02） |
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| 摘 要： | 为保障农户收获后高水分粮食不落地安全储藏,针对一种仓壁透气中心带通风立筒的圆形钢网式农户储粮干燥仓,应用CFD法对收获后高水分小麦在进行机械通风时的气流场进行仿真分析,将仓内小麦堆等效为多孔介质,分析静压、动压、流量等空间分布规律。结果表明:仓内静压和动压值随半径(横向)增加呈指数衰减;柱面流量随半径呈幂函数衰减;横截面流量随高度呈指数衰减;粮堆区竖向通风均匀度显著优于横向(径向);流量分布为仓底上粮面仓壁,仓壁气流流量只占总流量的24.6%;实仓风速测试结果与仿真分析结果规律一致,平均相对误差为16.35%,表明基于多孔介质模型和CFD法分析钢网式储粮干燥仓的流场分析具有较好的准确性,研究结果为此类钢网式储粮仓流场分析和优化提供了方法和依据。
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| 关 键 词： | 粮食 储藏 农户储粮仓 机械通风 流场分析 CFD法 多孔介质 |
| 收稿时间： | 2019/7/1 0:00:00 |
| 修稿时间： | 2019/12/3 0:00:00 |
Analyzing airflow in dry grain storage silo with ventilation using CFD |
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| Liu Liyi,Wang Yuqing,Zhao Deyan,Wang Xuguang,Lou Zheng and Liu Fangjiu.Analyzing airflow in dry grain storage silo with ventilation using CFD[J].Transactions of the Chinese Society of Agricultural Engineering,2020,36(2):312-319. |
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| Authors: | Liu Liyi Wang Yuqing Zhao Deyan Wang Xuguang Lou Zheng and Liu Fangjiu |
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| Institution: | 1.College of Engineering, Northeast Agricultural University, Harbin 150030,China;,1.College of Engineering, Northeast Agricultural University, Harbin 150030,China;,1.College of Engineering, Northeast Agricultural University, Harbin 150030,China;,1.College of Engineering, Northeast Agricultural University, Harbin 150030,China;,2.Institute of Planning and Design, Ministry of Agriculture and Rural Areas, Beijing 100125, China; and 3.Heilongjiang Zhongliang Warehousing Technology Engineering Co., Ltd., Harbin 150030, China |
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| Abstract: | Abstract: In order to ensure safe storage of highly moist grain after harvest and alleviate grain loss, we took a dry circular steel grain storage silo with a vertical ventilation tube in its center as an example and simulated airflow in the silo filled with highly moist wheat grain after harvest, using CFD. The effect of the wheat grain on airflow was approximated by a porous medium model, and the static and dynamic pressure in the silo was analyzed. The results showed that the static and dynamic pressure and the flow rate decrease exponentially with distance from the ventilation tube. Horizontally, the radial flow rate and the flow velocity (flow rate through per unit areas) both decreased with the distance from the ventilation tube in a power law. Vertically, both the flow rate and velocity decreased exponentially with the height of the grain. The ventilation in the grain stack area was more uniform in the vertical (longitudinal) direction than in the transverse (radial) direction, and the air velocity in the upper and lower part of the grain in the silo was higher than that in region from the vertical ventilation wall to 0.9m away from the central ventilation tube. It was found that the annular baffle with radius of 0.5 m and 0.9m could cover the upper surface and bottom of the silo respectively to improve uniformity of the ventilation. The airflow in the bottom of the silo was highest, followed by the upper surface. The minimum flow rate in the silo wall was only 24.6%, meaning that 1/4 of the flow was discharged from the silo wall and 3/4 was from the upper and low sides. The volume of the exhaust of the silo wall was on the low side. Wind speed test results were consistent with the simulations, with an average difference of 16.35%. When pressurized air was flow into the ventilation, air flowed radially and the air velocity in the central silo was higher than that in region proximal to the silo wall. It was suggested that periodically ventilating the silo by blowing pressurized air followed by suction with vacuumed air can improved evenness of the air in the silo. The wind speed measurements in the silo were in good agreement with the simulations, proving that combing CFD with the porous media model was accurate to simulate airflow in the silo. The simulation results provide guidance for improving and optimizing silo management. |
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| Keywords: | grain storage farmer''s grain storage mechanical ventilation flow field analysis CFD method porous media |
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