范新宇,常思勤,刘梁,戴建国.基于泵吸效应的电磁驱动配气机构温升抑制方案研究[J].农业机械学报,2016,47(1):337-343.
Fan Xinyu,Chang Siqin,Liu Liang,Dai Jianguo.Research on Temperature Suppression Scheme of Electromagnetic Valve Train Based on Pumping Effect[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(1):337-343.
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基于泵吸效应的电磁驱动配气机构温升抑制方案研究   [下载全文]
Research on Temperature Suppression Scheme of Electromagnetic Valve Train Based on Pumping Effect   [Download Pdf][in English]
投稿时间:2015-05-29  
DOI:10.6041/j.issn.1000-1298.2016.01.046
中文关键词:  电磁驱动配气机构  温升抑制  泵吸效应  对流传热
基金项目:国家自然科学基金项目(51306090)和江苏省自然科学基金项目(BK20130762)
作者单位
范新宇 南京理工大学 
常思勤 南京理工大学 
刘梁 南京理工大学 
戴建国 南京理工大学 
中文摘要:根据动圈式电磁驱动配气机构的结构特点和工作原理提出了一种温升抑制方案:利用动圈的泵吸效应,以环形切片作为开关阀片,在无需额外动力源驱动的前提下能够提升动圈与永磁体之间气隙内的气体流量与速度,从而有效强化气隙表面的对流传热效果。通过建立流动区域的数值模型,仿真分析了电磁驱动配气机构工作循环中阀片的响应规律以及气体流动状态,据此对方案结构进行了改进,通过更换材质减轻了阀片的质量并优化了阀片行程。最后开展了配气机构长时间工作下的温升测试试验,结果表明,改进后的方案对执行器温升抑制效果明显,在测量工况下各测量点中最高温升下降12.1℃。
Fan Xinyu  Chang Siqin  Liu Liang  Dai Jianguo
Nanjing University of Science and Technology,Nanjing University of Science and Technology,Nanjing University of Science and Technology and Nanjing University of Science and Technology
Key Words:electromagnetic valve train  temperature suppression  pumping effect  convective heat transfer
Abstract:Electromagnetic valve train (EMVT) in camless engine offers large potential for both part load fuel economy and high load engine torque. However, the temperature rise of EMVT at the high engine speed and full load is serious because of its large power density, which barricades the development of EMVT. According to the structure characteristic and operating principle of moving coil electromagnetic valve train, a novel scheme based on pumping effect of moving coil was proposed to enhance the gas flow rate and flow velocity in air gap between the moving coil and permanent magnetics, and strengthen the effect of convective heat transfer without additional drivers. Based on the theoretical analysis of convective heat and mass transfer, the main influential factors of this temperature suppression scheme were got, which includes the gas flow and gas peak velocity in air gap. Numerical model of flow area was established to analyze the dynamic responses of annular throttle slice and gas flow status, then structure of the scheme was improved accordingly. Simulation results indicate that the improved scheme, of which the material of annular throttle slices is carbon fiber and its working stroke is 0.2mm, then the gas flow and peak velocity of each cycle have reached to the maximum about 1.21mg and 58.9m/s under typical condition, respectively. Finally the temperature tests of electromagnetic valve train were carried out under long time operation, results show that the improved scheme has achieved a better efficiency to suppress the temperature of electromagnetic valve train, it has a significant drop about 12.1℃ in maximum for one measuring point under typical condition.

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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