高波,郭鹏明,闫龙龙,杜文强,张宁.双平板叶栅绕流的流动结构及其激励特性研究[J].农业机械学报,2017,48(10):108-114.
GAO Bo,GUO Pengming,YAN Longlong,DU Wenqiang,ZHANG Ning.Flow Structure and Excitation Characteristics of Flow around Double Plate Cascades[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(10):108-114.
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双平板叶栅绕流的流动结构及其激励特性研究   [下载全文]
Flow Structure and Excitation Characteristics of Flow around Double Plate Cascades   [Download Pdf][in English]
投稿时间:2017-01-07  
DOI:10.6041/j.issn.1000-1298.2017.10.013
中文关键词:  平板叶栅  尾迹干涉  激励机制  大涡模拟  三维流场
基金项目:国家自然科学基金项目(51576090)和江苏高校优势学科建设工程项目
作者单位
高波 江苏大学 
郭鹏明 江苏大学 
闫龙龙 江苏大学 
杜文强 江苏大学 
张宁 江苏大学 
中文摘要:绕流叶片的非稳态流动及其尾迹涡结构是诱发水力机械振动的主导因素。以横向布置的一对平板叶栅为研究对象,基于LES计算雷诺数在4.8×104下的三维绕流流场,分析绕流流场涡演化结构、升阻力及压力脉动等特性,以揭示尾迹干涉下平板绕流的流场结构及其激励机制。结果表明:该雷诺数下,单平板绕流平板表面存在错列布置的发卡涡结构,绕流尾迹呈现出高度的三维特性;双平板叶栅绕流状态下,上、下游平板间的间隙流动结构有明显抑制上游平板表面涡结构演化的作用;平板受力在模式H和模式L之间不断切换,且升力波动的幅值随阻力的增大而增大,尾迹干涉下下游平板受力的模式切换频率升高,升力波动幅值也增大;平板表面压力脉动的主要激励源为平板尾涡脱落。尾迹干涉下平板绕流及受力分析,可为水力机械叶片尾迹干涉下的流动主动控制提供参考。
GAO Bo  GUO Pengming  YAN Longlong  DU Wenqiang  ZHANG Ning
Jiangsu University,Jiangsu University,Jiangsu University,Jiangsu University and Jiangsu University
Key Words:plate cascade  wake interference  excitation mechanism  large-eddy simulation  three-dimensional flow field
Abstract:Unsteady flow and vortex-wake structure of flow around a blade are the main factors inducing hydro-mechanical vibration. A pair of plate cascades arranged transversely was taken as the research object. The three-dimensional flow field was calculated based on the large-eddy simulations (LES) when the Reynolds number was 4.8×104, and the characteristics of vortex evolution structure, lift and drag coefficients and pressure pulsation were analyzed. The flow field structure and excitation mechanism of the flow around the plate under wake interference were discussed. Results showed that the hairpin vortex structure on the surface of the single plate is staggered and the wake shows a high degree of three-dimensional characteristics under this Reynolds number. The flow structure between the upstream and downstream plates under the cascade flow regime significantly restrained the evolution of vortex structure on upstream plate surface. The force of plate was continuously switched between the regime H and regime L, and the magnitude of lift fluctuation was increased with the increase of drag. The regime switching frequency of downstream plate force under the wake interference and the amplitude of the lift fluctuation were both increased. Analysis on the results of flow and force around plate under wake interference can provide reference for active control of hydro-mechanical blades wake interaction, which would facilitate the development of the design to control vibrations and noise.

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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