气雾栽培箱喷雾条件下温度场的CFD数值模拟
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摘要
分析气雾栽培箱外部温度为18℃和20℃,18℃和22℃营养液雾化后,气雾栽培箱内部和生菜根系周围温度的变化,采用CFD(计算流体动力学)方法对气雾栽培箱内部温度场进行数值模拟与预测。结果表明:当气雾栽培箱外部温度18℃时,22℃营养液雾化后,气雾栽培箱内部温度的实测值和模拟值的差值均小于2.9℃,平均相对误差为8.1%,均方根误差为1.2℃。所建CFD模型准确有效。
The temperature inside the aeroponics cultivation box and the temperature of the lettuces' roots were simulated and predicted by computational fluid dynamics(CFD) method, after the atomization of the nutrient solution at 18 ℃ and 22 ℃ under the external temperature of the aeroponics cultivation box at 18 ℃ and 20 ℃. The results show that the difference between the measured value and the simulated value of the internal temperature of the aeroponics cultivation box is less than 2.9 ℃ after the atomization of the nutrient solution at 18 ℃ and 22 ℃ with the average relative error of 8.1% and mean square root error of 1.2 ℃. It is shown that the CFD model is accurate and effective.
The temperature inside the aeroponics cultivation box and the temperature of the lettuces' roots were simulated and predicted by computational fluid dynamics(CFD) method, after the atomization of the nutrient solution at 18 ℃ and 22 ℃ under the external temperature of the aeroponics cultivation box at 18 ℃ and 20 ℃. The results show that the difference between the measured value and the simulated value of the internal temperature of the aeroponics cultivation box is less than 2.9 ℃ after the atomization of the nutrient solution at 18 ℃ and 22 ℃ with the average relative error of 8.1% and mean square root error of 1.2 ℃. It is shown that the CFD model is accurate and effective.
引文
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[2]王珺玲,刘广晶,孙周平.雾培对黄瓜植株生长、产量和品质的影响[J].江苏农业科学,2009(1):174-176.
[3]RITTER E,ANGULO B,RIGA P,et al.Comparison of hydroponic and aeroponic cultivation systems for the production of potato minitubers[J].Potato Research,2001,44(2):127-135.
[4]KRATSCH H A,GRAVES W R,GLADON R J.Aeroponic system for control of root-zone atmosphere[J].Environmental and Experimental Botany,2006,55(1):70-76.
[5]黄全丰,赵云.机械通风温室夏季内部温度场及动态特性CFD模拟[J].农机化研究,2013,35(1):30-33.
[6]OKUSHIMA L,SASE S,NARA M.A support system for natural ventilation design of greenhouses based on computational aerodynamics[J].Acta Horticulturae,1989,248:129-136.
[7]张师帅.计算流体动力学及其应用:CFD软件的原理与应用[M].武汉:华中科技大学出版社,2011.
[8]赵春江,韩佳伟,杨信廷,等.基于CFD的冷藏车车厢内部温度场空间分布数值模拟[J].农业机械学报,2013,44(11):168-173.
[9]赵杰强,赵云.机械通风连栋温室的温度场CFD模拟[J].中国农机化学报,2014,35(6):76-79.
[10]周伟,汪小旵,李永博.可变边界条件下的Venlo温室温度场三维非稳态模拟[J].农业机械学报,2014,45(11):304-310.
[11]谭胜男,汪小旵,保智敏,等.温室内喷雾降温系统的CFD模拟[J].江苏农业学报,2013,29(2):283-287.
[12]王福军.计算流体动力学分析:CFD软件原理与应用[M].北京:清华大学出版社,2004.
[13]Fluent Inc.FLUENT6.3 Documentation[M].Lebanon NH:Fluent Inc,2006.
[14]杨其长,张成波.植物工厂概论[M].北京:中国农业科学技术出版社,2005.