| 摘要: |
| 为解决目前果蔬差压预冷的存在的降温不均匀性,设计了五种不同的外部遮挡开孔方式,包括32个均匀孔、32个非均匀孔、28个孔、40个孔及50个孔,建立了物理和数值模型,利用计算流体动力学(CFD)软件对土豆分别进行了五种开孔方式的数值模拟研究。对比分析了五种开孔方式的预冷模拟结果,预冷降温速率最快和均匀性最好的是32个非均匀孔的,并对此进行了实验验证,二者基本吻合。为差压通风预冷的外部遮挡或包装的开孔设计提出了建议:靠近压差风机处的开孔率要低以阻挡靠近差压风机侧气流,远离差压风机处开孔率要高,最底部的孔径应稍大于上部的。 |
| 关键词: 热工学 差压预冷 开孔方式 降温速率 预冷均匀性 |
| DOI：10.3969/j.issn.0253-4339.年份（4位数字）.月份（2位数字）.文章的起始页码（3位数字） |
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| Numeral Study and Experimental Verification of Vent-Hole Type of External Cover on Differential Pressure Cooling |
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Cai Jinhui Liu Bin Wang Yanhong Niu Jianhui
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| (Cai Jinhui1 Liu Bin1 Wang Yanhong2 Niu Jianhui3(1.Tianjin Key Lab of Refrigeration Technologies,Tianjin University of Commerce,300134,China,2.Zhejiang Dunan LL.C,311835,3.Hebei Institute of Architecture and Civil Engineering,075024,China)) |
| Abstract: |
| In order to solve the problem of cooling nonuniformity in forced air pre-cooling for vegetables and fruits,five vent-hole types were designed,and a physical model and a numerical model were established.The commercial software FLUENT was employed to simulate the cooling process of potatoes with five types of vent-holes,respectively.The simulation results show that the cooling rate was highest and the pre-cooling uniformity was best with 32 non-uniform vent-holes.Our experimental data agree reasonably with th... |
| Key words: Pyrology Differential pressure cooling Vent-hole type Cooling rate Pre-cooling uniformity |
