农业工程学报Issue(7)：246-253,8.DOI:10.3969/j.issn.1002-6819.2013.07.031
冷库空气幕流场的非稳态数值模拟及验证
Unsteady state numerical simulation and verification of flow field of air curtain in cold stores
摘要
Abstract
The temperature in cold stores is easily influenced due to hot air infiltration into the cold store during loading and uploading. Air curtains are commonly used to cut off airflow between the cold store and a hot environment, and reduce heat and mass transfer for maintaining the low temperature in the cold store. This was done in order to study the variation of the airflow field and temperature field in the cold store when the air curtain was opened. The aim of this study was to predict the temperature field and air flow field in the cold store when the door and air curtain were opened for 60s against an unsteady state simulation of air curtain used in the cold store by using CFD software and the simulation results of the temperature field in the cold store were used for experimental verification. The simulation results reflected that when the door and air curtains were opened, the hot air easily infiltrated into the cold store from both the sides and bottom of the entrance due to the slow velocity decrease of the central mainstream and fast velocity decrease of both sides of the air curtain. The temperature of the area closer to the fan increased faster in the cold store because the air velocity of this area was so low that the temperature field of this area was easily influenced by the hot air. Furthermore, the intrusive hot air changed the cold airflow trace, and swirling eddies formed around the central area of the cold store by the pressure difference between the hot and cold air destroyed the uniform air distribution and temperature field in the cold store. In a future study, the unsteady state simulation time step of the air curtain can be increased to obtain the time in which the temperature field and airflow field reach a uniform state in the cold store.关键词
冷藏/空气幕/非稳态流场/数值模拟/冷库Key words
cold storage/air curtains/unsteady flow/numerical simulation/cold store分类
通用工业技术引用本文复制引用
缪晨,谢晶..冷库空气幕流场的非稳态数值模拟及验证[J].农业工程学报,2013,(7):246-253,8.基金项目
2012年国家农业成果转化资金项目(2012GB2C000146) （2012GB2C000146）
2011年度上海市农业科技成果转化资金项目(编号:113919N0700) （编号:113919N0700）
上海市科委工程中心建设(编号:11DZ2280300) （编号:11DZ2280300）
