排灌机械工程学报
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排灌机械工程学报  2011, Vol. 29 Issue (1): 82-86    DOI: 10.3969/j.issn.1674-8530.2011.01.017
节水灌溉工程 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
基于CFD的多孔管热风数值模拟与设计方法
王新坤, 许文博, 赵 坤, 李俊红, 许 颖
(江苏大学 流体机械工程技术研究中心, 江苏 镇江 212013)
Numerical simulation and design method of hot air for porous pipe based on CFD
Wang Xinkun, Xu Wenbo, Zhao Kun, Li Junhong, Xu Ying
(Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
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摘要 针对目前温室热风采暖效率较低的现状,提出将多孔管应用于温室热风采暖的设计方法.利用Pro/E软件完成多孔管造型,应用Fluent6.2软件并设置三维雷诺平均Navier-Stokes方程、RNG k-ε紊流模型和SIMPLEC算法对多孔管内部流场进行了数值模拟.采用二分法搜索原理、数值传热学理论、流体力学和逆递推法对多孔管热风采暖进行设计计算,并运用VB 6.0软件对其进行编程计算,得到了多孔管滴灌器的流态指数为0.507,性能良好:当设定进、出口压力分别为10,0kPa,进、出口温度分别为300,278K,边界壁面传热系数为0.055时,多孔管各出风孔口温度值几乎不变,压力值沿多孔管产生压降,约为200Pa.设计方法所得结果比数值模拟结果略高,各出风孔口处压力值和温度值的设计曲线和模拟曲线趋势一致,且压力值和温度值的均匀系数均大于0.8,满足多孔管热风流动均匀性的要求.
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王新坤
许文博
赵 坤
李俊红
许 颖
关键词多孔管   温室采暖   逆递推法   数值模拟;节能     
Abstract: To overcome the condition that the lowly efficient use of hot air heating in greenhouse, a design method of hot air heating for a porous pipe in greenhouse was put forward. The model of a porous pipe was created by using the Pro/E, the computational fluid dynamics software Fluent 6.2 was adopted to simulate the porous pipe interior flow mechanism and performance by setting up the Reynolds averaged Navier-Stokes equations, the RNG k-εturbulent model and the SIMPLEC algorithm. By using the search principle of bisection algorithms, numeric heat transfer theory, hydrodynamics and back step method, a design method of hot air heating in a porous pipe was studied, meanwhile which was computed by making use of VB 6.0 computer language program. The results show that the flow index of emitter on the porous pipe is 0.507, the performance is fine. When the inlet pressure is 10 kPa, the outlet pressure is 0 Pa, the inlet temperature is 300 K, the outlet temperature is 278 K, the coefficient of conducting heat of the boundary is 0.055, the temperatures on the other orifice on the porous pipe were almost the same, and the pressures had the pressure-drop of about 200 Pa. The results of design were a little higher than that of numerical simulated ones, but the curves agreed with the pressure and temperature. Both the pressure and temperature uniformity coefficients were larger than 0.8, which satisfied the need of hot air flow uniformity for a porous pipe.
Key words   
收稿日期: 2010-03-18; 出版日期: 2011-01-30
基金资助:

国家863计划项目(2006AA100211);江苏大学江苏省现代农业装备与技术重点实验室开放基金资助项目(NZ200808)

通讯作者: 王新坤(1966-),男,陕西临潼人,研究员(xjwxk@126.com ),主要从事农业高效用水理论与新技术及其推广应用研究.   
作者简介: 许文博(1985-),男,黑龙江北安人,硕士研究生(xuwenbo168@163.com),主要从事节水灌溉理论与新技术研究.
引用本文:   
王新坤,许文博, 赵 坤等. 基于CFD的多孔管热风数值模拟与设计方法[J]. 排灌机械工程学报, 2011, 29(1): 82-86.
WANG Xin-Kun,XU Wen-Bo, Zhao- Kun et al. Numerical simulation and design method of hot air for porous pipe based on CFD[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(1): 82-86.
 
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