中国农业大学学报2018，Vol.23Issue(5)：117-121,5.DOI:10.11841/j.issn.1007-4333.2018.05.14
井窖风场特征的CFD模拟与验证
CFD simulation and verification of wind field characteristic in transplanting hole
摘要
Abstract
In order to clarify the mechanism of suitable water and heat conditions in transplanting hole,this study analyzed the effects of the wind speed near the soil surface on air velocity in the transplanting hole.Based on the threedimensional numerical simulation model of transplanting hole under the condition of no crops planted,CFD software was used to simulate the internal airflow in the transplanting hole at 1.50,2.70 and 3.90m/s,respectively.The flow velocity was verified by experimental test.The simulation results showed that the average air speed of the longitudinal section was 0.25,0.48 and 0.72m/s,respectively,when the wind speeds near the soil surface were 1.50,2.70 and 3.90m/s.In general,the average air velocity in the transplanting hole was reduced by 81.54％to 83.34％.When the wind direction near the soil surface was from right to left,the air in the vertical section of the transplanting hole was counterclockwise.The verification results showed that there was a positive linear correlation between the air velocity in the transplanting hole and the wind speed near the soil surface,and this linear fitting equation was y=0.220 9x-0.176(R2=0.925 3).When the wind speed near the soil surface was 2.70m/s,the air flow rate was 0.42m/s by measurement and was 0.48m/s by simulation in the transplanting hole of well-cellar style transplanting,respectively. The dispersed heat and moisture from the transplanting hole were decreased due to small atmospheric disturbances from the soil surface,which contributed to the maintenance of the suitable water and heat conditions for the growth of tobacco seedlings.关键词
移栽方式/井窖/风场/空气交换/计算流体力学Key words
transplanting method/transplanting hole/wind field/air exchange/computational fluid dynamics分类
农业科技引用本文复制引用
林叶春,高维常,陈懿,陈伟,丁福章,潘文杰..井窖风场特征的CFD模拟与验证[J].中国农业大学学报,2018,23(5):117-121,5.基金项目
贵州省优秀青年人才培养对象专项(黔科合人字[2015]34号) （黔科合人字[2015]34号）
中国烟草总公司重点项目(110201402012) （110201402012）
贵州省科技重大专项(黔科合重大专项字[2014]6015-3) （黔科合重大专项字[2014]6015-3）
