郭钟华,李小宁,香川利春.气动真空发生器系统背压与抽吸性能关系分析[J].农业机械学报,2015,46(2):312-315,350.
Guo Zhonghua,Li Xiaoning,Kagawa Toshiharu.Relationship between Back Pressure and Suction Ability of Pneumatic Ejector System[J].Transactions of the Chinese Society for Agricultural Machinery,2015,46(2):312-315,350.
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气动真空发生器系统背压与抽吸性能关系分析   [下载全文]
Relationship between Back Pressure and Suction Ability of Pneumatic Ejector System   [Download Pdf][in English]
投稿时间:2014-11-07  
DOI:10.6041/j.issn.1000-1298.2015.02.046
中文关键词:  气动系统 真空发生器 背压 吸入流量
基金项目:国家自然科学基金资助项目(51305202)和江苏省自然科学基金资助项目(BK20130764)
作者单位
郭钟华 南京理工大学 
李小宁 南京理工大学 
香川利春 东京工业大学 
中文摘要:对气动系统中常用的真空发生器样机,采用有限体积法对其内部流场进行数值计算,分析了背压不同时内部压力分布和吸入流速改变情况。以此为基础,测量系统背压升高时吸入流量变化量,绘制了背压与吸入流量关系曲线,提出了通过判断系统背压防止逆流现象的方法。在真空发生器系统的设计和应用中,需要在理论计算的基础上,根据试验得出系统正常工作的背压范围,防止逆流现象,保证系统工作。
Guo Zhonghua  Li Xiaoning  Kagawa Toshiharu
Nanjing University of Science and Technology,Nanjing University of Science and Technology and Tokyo Institute of Technology
Key Words:Pneumatic system Pneumatic ejector Back pressure Suction flow rate
Abstract:Pneumatic ejector is an important vacuum source for agricultural automation. During the application of pneumatic ejector, the increasing back pressure may cause the suction ability to get worse intensely and the normal operation of the system will be greatly influenced. Regarding the ejectors used in pneumatic systems, the air flow was analyzed with finite volume method based on ejector inner mechanical structural parameters. The changes of pressure distribution and suction flow velocity were studied when the back pressure was variable. Based on the theoretical analysis, an experimental apparatus was set up and the suction mass flow rate was measured as the back pressure increased. The relationship between back pressure and suction mass flow rate was obtained. Judging from both of theoretical analysis and experimental result, the suction flow rate characteristics remained unchanged at first and then got worse intensely as the back pressure increased. A method was proposed to prevent reverse flow by estimating back pressure, which was an effective complementary approach for ejector systematic design. When designing a pneumatic ejector system, the back pressure range where the ejector worked normally should be derived both from theoretical calculation and experimental test. Reverse flow could be prevented if the back pressure was controlled within normal range, thus the optimum performance would be achieved.

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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