Analysis of unsteady flow around an axial circular cylinder of critical geometry using combined synchronous measurement in magnetic suspension and balance system
Analysis of unsteady flow around an axial circular cylinder of critical geometry using combined synchronous measurement in magnetic suspension and balance system
复制标题
磁悬浮与平衡系统同步同步测量分析临界几何轴向圆柱周围非定常流动
DOI：
10.1007/s00348-020-03101-7
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发表时间：
2021
影响因子：
2.4
通讯作者：
Asai Keisuke
中科院分区：
文献类型：
--
作者：
Yokota Sho;Ochiai Taku;Ozawa Yuta;Nonomura Taku;Asai Keisuke
摘要 利用磁悬浮与平衡系统（MSBS）研究了自由流排列圆柱体的尾流结构及其气动特性，该系统可以悬浮模型以消除支撑干扰。本研究的目的是研究自由流对齐的圆柱体周围的流场，并阐明其对气动力和基础压力的影响。实验使用 0.3 米 MSBS 进行无支撑风洞测试。使用细度比（长度与直径，L/D）为 1.0、1.25、1.5、1.75、2.0 和 2.25 的六种模型。自由流速度设置为 10 和 20 m/s，分别对应于基于模型直径 和 的雷诺数。测量每个自由流对齐的圆柱体的速度场、气动力和基础压力。在非附着流场中观察到频率为 和 的两个特征波动。在轴向方向上观察到与拖曳力和基础压力相关的低频轴对称波动。在径向方向上观察到与升力相关的高频反对称波动。这些特征与先前研究中报道的在盘后观察到的再循环气泡泵送和涡流脱落的特征非常一致（Berger 等人，J Fluids Struct 4(3):231–257, 1990；Yang 等人，Phys Fluids 27(6):064101, 2015）。图形摘要
AbstractThe wake structure of a freestream-aligned circular cylinder and its aerodynamic characteristics were investigated using a magnetic suspension and balance system (MSBS), which can levitate a model to eliminate support interference. The objectives of the present study were to investigate the flow field around a freestream-aligned circular cylinder and to clarify its effect on the aerodynamic force and base pressure. Experiments were conducted using a 0.3-m MSBS for support-free wind tunnel tests. Six models with fineness ratios (length to diameter,L/D) of 1.0, 1.25, 1.5, 1.75, 2.0, and 2.25 were used. The freestream velocity was set to 10 and 20 m/s, which correspond to Reynolds numbers based on model diameters ofand, respectively. The velocity field, aerodynamic force, and base pressure were measured for each freestream-aligned circular cylinder. Two characteristic fluctuations with frequencies ofandwere observed in a nonreattaching flow field. A low-frequency axisymmetric fluctuation related to the drag force and base pressure was observed in the axial direction. A high-frequency antisymmetric fluctuation related to the lift force was observed in the radial direction. These features are in good agreement with those of both recirculation-bubble pumping and vortex shedding observed in the wake of a disk reported in previous studies (Berger et al., J Fluids Struct 4(3):231–257, 1990; Yang et al., Phys Fluids 27(6):064101, 2015).Graphic abstract
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影响因子：
3.7
作者：
H. Higuchi;H. Sawada;H. Kato
通讯作者：
H. Higuchi;H. Sawada;H. Kato
使用磁悬浮和平衡系统测量的 0.75-2.0 细度比对自由流排列圆柱体气动阻力的影响
影响因子：
2.4
作者：
T. Nonomura;Kei Sato;Keita Fukata;Hayato Nagaike;Hiroyuki Okuizumi;Y. Konishi;K. Asai;H. Sawada
通讯作者：
H. Sawada
长细比为 1.27 至 1.79 的平行于气流的气缸的阻力和背压
DOI：
10.5359/jwe.32.113
发表时间：
2007
期刊：
--
影响因子：
--
作者：
秀夫 澤田;徹也 国益;信一 須田;徹 御簾納;博之 樋口
通讯作者：
博之 樋口
影响因子：
3.7
作者：
Georgios Rigas;A. Oxlade;A. Morgans;J. Morrison
通讯作者：
Georgios Rigas;A. Oxlade;A. Morgans;J. Morrison
具有磁悬浮和平衡系统的低细度比自由流对准气缸的气动特性
影响因子：
2.5
作者：
Shinji K.;Nagaike H.;Nonomura T.;Asai K.;Okuizumi H.;Konishi Y.;Sawada H.
通讯作者：
Sawada H.