闫大壮,杨培岭,任树梅.滴头流道中颗粒物质运移动态分析与CFD模拟[J].农业机械学报,2007,38(6):71-74.
.[J].Transactions of the Chinese Society for Agricultural Machinery,2007,38(6):71-74.
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滴头流道中颗粒物质运移动态分析与CFD模拟   [下载全文]
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DOI:10.3969/j.issn.1000-1298.[year].[issue].[sequence]
中文关键词:  迷宫式滴头  DPM模型  堵塞机理  模拟
基金项目:
闫大壮  杨培岭  任树梅
中国农业大学
中文摘要:采用CFD模拟技术,对迷宫式滴头流道内不同质量浓度的悬浮颗粒运动情况进行数字化模拟计算,并采用两相流动力学理论对迷宫式滴头结构尺度下的悬浮颗粒的随流性进行了分析,研究结果表明,采用DPM模型对悬浮颗粒分布特点的模拟结果与已有试验数据吻合度较高,可以作为模拟的手段;水流中颗粒质量浓度对滴头内部流场有着较强的反作用,应在模拟过程中予以重视;根据Stokes数的计算结果,10%左右的颗粒随流性差,可以认为导致滴头堵塞的物质主要来自于这一部分颗粒。
Key Words:
Abstract: The simulation of the suspended particles movements at the different concentrations in the labyrinth emitter was approached by using computational fluid dynamics (CFD) technology. The ability of suspended particles movement along with water in the labyrinth emitter was analyzed by using two-phase flow dynamics. The results indicated that the simulation results of suspended particles movement by using DPM model showed a higher similarity comparing with the previous experiments. And the CFD technology is a good method to simulate the movement of the particle in the emitter path;the reaction of the particles to the flow in the emitter was intense and should not be ignored in the simulation;according to the Stokes number compute results, some particles could not keep along with the water well, and those particles can be considered as the emitter fouling substances.

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.

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