张 烨,李长友,马兴灶,李建民,邹湘军,王润发.干燥机粮层通风阻力特性数值模拟与试验[J].农业机械学报,2014,45(7):216-221.
Zhang Ye,Li Changyou,Ma Xingzao,Li Jianmin,Zou Xiangjun,Wang Runfa.Experiment and Numerical Simulation of Layer Resistance Parameters in Dryer[J].Transactions of the Chinese Society for Agricultural Machinery,2014,45(7):216-221.
摘要点击次数: 3385
全文下载次数: 1379
干燥机粮层通风阻力特性数值模拟与试验   [下载全文]
Experiment and Numerical Simulation of Layer Resistance Parameters in Dryer   [Download Pdf][in English]
投稿时间:2014-02-09  
DOI:10.6041/j.issn.1000-1298.2014.07.034
中文关键词:  干燥机 粮层阻力 多孔介质 修正后Ergun模型
基金项目:国家自然科学基金资助项目(31371871、31071583)和高等学校博士学科点专项科研基金资助项目(20114404110021、20060564003)
作者单位
张 烨 华南农业大学 
李长友 华南农业大学 
马兴灶 华南农业大学 
李建民 华南农业大学 
邹湘军 华南农业大学 
王润发 华南农业大学 
中文摘要:粮层内部通风阻力特性是影响干燥均匀性和能量损耗的关键因素之一。针对传统的经验公式存在精度偏低、未考虑粮层多孔介质的复杂变化因素和非线性的不确定性问题,基于传统的Ergun模型进行了压力损失因素分析;在通风阻力试验平台测定试验数据,通过探索性分析方法对风速进行分段,引入误差影响因子λ,导出了一种新的基于多孔介质Ergun的稻谷变层压力场模型;给出了优化阻力特性曲线,构建了变层阻力与层厚的数学关系。试验结果证实,风速小于0.2m/s时,λ取值为1;风速在0.2~0.4m/s范围内时,λ取值为0.89;风速在0.4~0.6m/s范围内时,λ取值为0.79。
Zhang Ye  Li Changyou  Ma Xingzao  Li Jianmin  Zou Xiangjun  Wang Runfa
South China Agricultural University;South China Agricultural University;South China Agricultural University;South China Agricultural University;South China Agricultural University;South China Agricultural University
Key Words:Dryer Layer resistance Porous media Revised Ergun model
Abstract:Ventilation resistance characteristic of grain layer is the key influence factor to the drying uniformity and energy consumption, is also the theoretical foundation parameter for layer design and fan selection. The traditional empirical formulas of ventilation resistance of grain layer are low precision and ignore the complicated changes and nonlinear uncertainty problems of grain layer porous media. The pressure loss factors were discussed based on the traditional Ergun model. By testing the airflow resistance on test platform, dividing the air velocity into subsections by the exploratory analysis method, and introducing an error influence factor λ, a new pressure field model of variable layer was derived based on the Ergun model. The optimal resistance characteristic curve was given, and the relationship between the ventilation resistance and layer thickness was built. The results show that when the air velocity is less than 0.2m/s, the λ is 1; when the velocity is between 0.2m/s and 0.4m/s, the λ is 0.89; and when the velocity is between 0.4m/s and 0.6m/s, the λ is 0.79.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

   下载PDF阅读器