三种不同通风道对浅圆仓通风效果的模拟研究
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摘要
基于多孔介质流动和热湿耦合传递理论,推导得到了浅圆仓的粮堆内部动量方程、能量方程和水分守恒方程,通过数值求解法解决仓储粮堆的自然对流、热量传递和水分传递之间的问题。采用Fortran编程的方法,针对浅圆仓的十字型通风道、环型通风道、组合型(十字型加环型)通风道的通风效果进行了数值模拟分析。结果表明:组合型通风道相比其它两种通风道仓内气流分布更加均匀,降温保水效果最好,更有利于粮食的安全储存和节能降耗。为浅圆仓通风道的选择和设计提供了理论指导和依据。
Based on the theory of flows through porous media and coupled heat and moisture transfer, the momentum equation, energy equation and water conservation equation for interior of grain pile in squat silo were derived. The problems such as natural convection, heat transfer and moisture transfer of stored grain were solved by numerical solution. The ventilation effect of cross ventilation duct, annular ventilation duct and combined(cross and annular type) ventilation duct of squat silo was analyzed by numerical simulation with Fortran language. The results show that air distribution in combined(cross and annular type) ventilation duct are more evenly than that in the other two types of air ducts, which has the best effect of cooling and water conservation, therefore more propitious to the safe storage and energy saving. The result can provide theoretical guidance and basis for the selection and design of ventilation duct for squat silos.
Based on the theory of flows through porous media and coupled heat and moisture transfer, the momentum equation, energy equation and water conservation equation for interior of grain pile in squat silo were derived. The problems such as natural convection, heat transfer and moisture transfer of stored grain were solved by numerical solution. The ventilation effect of cross ventilation duct, annular ventilation duct and combined(cross and annular type) ventilation duct of squat silo was analyzed by numerical simulation with Fortran language. The results show that air distribution in combined(cross and annular type) ventilation duct are more evenly than that in the other two types of air ducts, which has the best effect of cooling and water conservation, therefore more propitious to the safe storage and energy saving. The result can provide theoretical guidance and basis for the selection and design of ventilation duct for squat silos.
引文
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[14]张达,郑德乾,陈桂香,等.高大平房仓散装粮堆压力场FLAC~(3D)数值模拟[J].河南工业大学学报(自然科学版),2017,38(6):98-103.
[2]陈桂香,岳龙飞,王振清,等.钢筋混凝土地下粮仓准静态温度场数值模拟[J].中国粮油学报,2014,29(3):79-83.
[3]THOMPSON T L.Temporary storage of high-moisture shelled corn using continuous aeration[J].Transaction of American Society of Agriculture Engineers.1972,15(2):333-337.
[4]THORPE G R.The application of computational fluid dynamics codes to simulate heat and moisture transfer in stored grains[J].JStored Prod Res,2008,44(1):21-31.
[5]王远成,潘钰,尉尧方,等.仓储粮堆内部自然对流和热湿传递的数学分析和验证[J].中国粮油学报,2017,32(9):120-130.
[6]吴子丹,赵会义,曹阳,等.粮食储藏生态系统的仿真技术应用研究进展[J].粮油食品科技,2014,22(1):1-6.
[7]李岩峰,张来林,曹阳,等.小麦导热系数的测定[J].河南工业大学学报(自然科学版).2010(1):68-70.
[8]CONVERSE H H,GRACES A H,CHUNG D S.Transient heat transfer within wheat stored in a cylindrical bin[J].Transaction of American Society Agriculture Engineering,1973,16(1):129-133.
[9]JIEHEI ZHANG,AJAYKUMAR GUPTA,JOHN BAKER.Effect of relative humidity on the prediction of natural convection heat transfer coefficients[J].Heat Transfer Engineering,2007,28(4):94-102.
[10]潘钰,王远成,邱化禹,等.粮仓机械通风阻力和均匀性模拟研究[J].山东建筑大学学报,2016,31(3):255-258.
[11]邱化禹,王远成,高帅,等.横向通风系统充氮气调的数值模拟与现场试验对比[J].粮食储藏,2015,44(6):22-26.
[12]Fahad G Al-Amri,Maged A I El-Shaarawi.Combined forced convection and surface radiation between two parallel plates[J].International Journal of Numerical Methods for Heat&Fluid Flow,2010,20(2):22-26.
[13]张辰,朱君生.CFD仿真技术在粮食仓储上的应用[J].粮油仓储科技通讯,2018,34(4):18-19.
[14]张达,郑德乾,陈桂香,等.高大平房仓散装粮堆压力场FLAC~(3D)数值模拟[J].河南工业大学学报(自然科学版),2017,38(6):98-103.