王超,朱金波,胡标.环空淹没射流吸气性能与能量耗散特征研究[J].农业机械学报,2016,47(8):14-21,13.
Wang Chao,Zhu Jinbo,Hu Biao.Suction Performance and Energy Dissipation Characteristics of Annular Submerged Jets[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(8):14-21,13.
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环空淹没射流吸气性能与能量耗散特征研究   [下载全文]
Suction Performance and Energy Dissipation Characteristics of Annular Submerged Jets   [Download Pdf][in English]
投稿时间:2016-05-23  
DOI:10.6041/j.issn.1000-1298.2016.08.003
中文关键词:  淹没条件  环空射流  吸气性能  能量耗散
基金项目:国家自然科学基金面上项目(51374015)和国家自然科学基金青年基金项目(51501002)
作者单位
王超 安徽理工大学 
朱金波 安徽理工大学 
胡标 安徽理工大学 
中文摘要:淹没条件下喷嘴出口存在外界静压,引射管的截面和入流压力对环空射流过程中的吸气性能和能量耗散都有显著的影响。为能更好地对淹没条件下环空射流喷嘴进行调控,采用数值模拟与试验验证的方法分析了不同截面比和入流压力对喷头吸气量和气液比的影响,并从流场、能量耗散以及涡流强度3方面对这些影响进行了研究。结果表明:低截面比下,随着入流压力的提高,吸气量和气液比都随之提高;高截面比下,随着入流压力的提高,吸气量提高而气液比则先增加后降低,这种工况下气液比存在最大值。随着截面比的提高,吸气量增加而气液比则降低;不同入流压力下低截面比对气液比存在高可控性;不同截面比下高引射流入流压力对气液比存在高可控性。相同的湍动能增量下,不同截面比的湍流耗散率的增量远大于不同入流压力的湍流耗散率增量,能量耗散更大。这些特性与不同入流压力时引射流与槽内水压差以及不同截面时引射流对喷嘴的封闭作用有关。
Wang Chao  Zhu Jinbo  Hu Biao
Anhui University of Science and Technology,Anhui University of Science and Technology and Anhui University of Science and Technology
Key Words:submerged condition  annular jets  suction performance  energy dissipation
Abstract:Under submerged condition, due to the external static pressure at nozzle exit, the cross section and inflow pressure of ejector pipe have significant impact on the suction performance and energy dissipation of annular jet device. In order to better adjust the annular jet nozzle, the methods of numerical simulation and experimental validation were adopted to analyze the impact of different cross section ratios and different inflow pressures on nozzle’s inspiration capacity and gas liquid ratio. From flow field, the energy dissipation and the intensity of vortex were explained for these effects. Results showed that both inspiration capacity and gas liquid ratio were increased in low cross section ratio, but in high cross section ratio inspiration capacity was decreased while gas liquid ratio was increased firstly and then decreased with the increase of inflow pressure, thus the ratio got the maximum value in this case. With the increase of cross section ratio, the inspiration capacity was increased while the gas liquid ratio was decreased. Different inflow pressures had good controllability for the gas liquid ratio with low cross section ratio, meanwhile, different cross section ratios had remarkable controllability for the gas liquid ratio at high inflow pressure. Under the same kinetic energy increment, the turbulent dissipation rate increment at different cross sections was considerably larger than the increment at different inflow pressures, thus the value of energy dissipation at different cross sections was large. All these features had relation to pressure difference between ejection fluid and water in the tank at different inflow pressures and sealing process of ejection fluid for nozzle at different sections.

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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