基于玉米通风阻力试验的Ergun模型修正
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摘要
为了提高玉米干燥的数值模拟的准确性,结合试验对数值模拟中选用描述玉米通风阻力的传统模型进行完善。为此,将玉米层视为多孔介质区域进行分析,从而确定选用的阻力方程为最常用的Ergun方程;因不同风速选用的湍流模型不同,试验数值与Ergun计算值出入很大,因而对Ergun方程进行修正,按区间引入影响因子,合理化修正完善传统Ergun模型,得到更适用于玉米通风阻力的数学模型。最后,结合修正后的模型分析研究玉米层厚度、给定风速及孔隙率对通风阻力的影响。
In order to improve the accuracy of the numerical simulation of corn drying,the traditional model describing the ventilation resistance of corn was chosen for the numerical simulation by combining the experiments. In this paper,the corn layer is regarded as the porous media area for analysis,so that the selected resistance equation is the most commonly used Ergun equation. Different turbulence models selected for different wind speeds are different. The experimental values and the Ergun calculated values are very different,so the Ergun equation is modified. Influencing factors are introduced by intervals,and the traditional Ergun model is rationally modified to obtain a mathematical model that is more suitable for ventilation resistance of corn. Combined with the modified model analysis,the effects of corn layer thickness,given wind speed and porosity on ventilation resistance were studied.
In order to improve the accuracy of the numerical simulation of corn drying,the traditional model describing the ventilation resistance of corn was chosen for the numerical simulation by combining the experiments. In this paper,the corn layer is regarded as the porous media area for analysis,so that the selected resistance equation is the most commonly used Ergun equation. Different turbulence models selected for different wind speeds are different. The experimental values and the Ergun calculated values are very different,so the Ergun equation is modified. Influencing factors are introduced by intervals,and the traditional Ergun model is rationally modified to obtain a mathematical model that is more suitable for ventilation resistance of corn. Combined with the modified model analysis,the effects of corn layer thickness,given wind speed and porosity on ventilation resistance were studied.
引文
[1]赵德春,郭湘琳,曾庆辉,等.北方高水分玉米多级顺流干燥智能控制技术的研究[J].农机化研究,2007(10):51-52.
[2] Sacilik K. Resistance of bulk poppy seeds to airflow[J]. Bi-osystems Engineering,2004,89(4):435-443.
[3]杨进,杨国峰,黄祖申.粮层深度与粮层阻力关系的试验分析[J].中国粮油学报,2001,16(2):47-49.
[4] Morey R V,Keener H M,Thompson,et al. Present Status ofgrain drying simulation[J]. ASAE. Paper,1978(2):177-178.
[5] C K Shedd. Resistance of Grains and Seeds to Air Flow[J].Agricultural engineering,1953,34(9):616-619.
[6] Ergun S. Fluid flow through packed columns[J]. Chem.eng. prog,1952,48(2):89-94.
[7] Yang X,Williams D L. Airflow resistance of grain sorghumas affected by bulk density.[J]. Transactions of the Asae,1990,33(6):1966-1970.
[8]刘伟,范爱武,黄晓明.多孔介质传热传质理论与应用[M].北京:科学出版社,2006.
[9]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.
[10]吴沿友,郭晓君,付为国,等.红树林多孔介质阻力模型与消波效果仿真分析[J].农业工程学报,2012,28(23):92-97.
[11]马坤.多孔介质中湍流流动的数值模拟[D].大连:大连理工大学,2009.
[12]李鹏飞,徐敏义,王飞飞.精通CFD工程仿真与案例实战[M].北京:人民邮电出版社,2011.
[13] Khatchatourian O A,Toniazzo N A,Gortyshov Y F. Simu-lation of airflow in grain bulks under anisotropic conditions[J]. Biosystems Engineering,2009,104(2):205-215.
[14]于立章,孙立成,孙中宁.多孔介质通道中单相流动压降预测模型[J].核动力工程,2010,31(5):63-66.
[15]刘文忠,赵满全,王文明.气吸式排种装置排种性能分析[J].农机化研究,2008(9):45-47.
[16]赵晓根.谷物颗粒流动特性的试验研究[D].呼和浩特:内蒙古农业大学,2007.
[17]员美娟.多孔介质中流体的若干流动特性研究[D].武汉:华中科技大学,2008.
[18] Dullien F A L. Porus Media—Fluid Transport and PoreStructure[J]. Porous Media Fluid Transport&Pore Struc-ture,1979,36(2):159.
[19]朱英开.基于多孔介质理论的粮层阻力数值模拟[D].呼和浩特:内蒙古农业大学,2013.
[20]孔珑.两相流体力学[M].北京:高等教育出版社,2002.
[21]毛迪凡.孔隙介质渗流基本方程的改进[D].北京:中国地质大学,2012.
[2] Sacilik K. Resistance of bulk poppy seeds to airflow[J]. Bi-osystems Engineering,2004,89(4):435-443.
[3]杨进,杨国峰,黄祖申.粮层深度与粮层阻力关系的试验分析[J].中国粮油学报,2001,16(2):47-49.
[4] Morey R V,Keener H M,Thompson,et al. Present Status ofgrain drying simulation[J]. ASAE. Paper,1978(2):177-178.
[5] C K Shedd. Resistance of Grains and Seeds to Air Flow[J].Agricultural engineering,1953,34(9):616-619.
[6] Ergun S. Fluid flow through packed columns[J]. Chem.eng. prog,1952,48(2):89-94.
[7] Yang X,Williams D L. Airflow resistance of grain sorghumas affected by bulk density.[J]. Transactions of the Asae,1990,33(6):1966-1970.
[8]刘伟,范爱武,黄晓明.多孔介质传热传质理论与应用[M].北京:科学出版社,2006.
[9]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.
[10]吴沿友,郭晓君,付为国,等.红树林多孔介质阻力模型与消波效果仿真分析[J].农业工程学报,2012,28(23):92-97.
[11]马坤.多孔介质中湍流流动的数值模拟[D].大连:大连理工大学,2009.
[12]李鹏飞,徐敏义,王飞飞.精通CFD工程仿真与案例实战[M].北京:人民邮电出版社,2011.
[13] Khatchatourian O A,Toniazzo N A,Gortyshov Y F. Simu-lation of airflow in grain bulks under anisotropic conditions[J]. Biosystems Engineering,2009,104(2):205-215.
[14]于立章,孙立成,孙中宁.多孔介质通道中单相流动压降预测模型[J].核动力工程,2010,31(5):63-66.
[15]刘文忠,赵满全,王文明.气吸式排种装置排种性能分析[J].农机化研究,2008(9):45-47.
[16]赵晓根.谷物颗粒流动特性的试验研究[D].呼和浩特:内蒙古农业大学,2007.
[17]员美娟.多孔介质中流体的若干流动特性研究[D].武汉:华中科技大学,2008.
[18] Dullien F A L. Porus Media—Fluid Transport and PoreStructure[J]. Porous Media Fluid Transport&Pore Struc-ture,1979,36(2):159.
[19]朱英开.基于多孔介质理论的粮层阻力数值模拟[D].呼和浩特:内蒙古农业大学,2013.
[20]孔珑.两相流体力学[M].北京:高等教育出版社,2002.
[21]毛迪凡.孔隙介质渗流基本方程的改进[D].北京:中国地质大学,2012.