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不同宽度比串列方柱流场和气动力特性研究
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作者 张欣怡 李方慧 +3 位作者 范佳红 寇佳茵 尚靖淳 隋京航 《低温建筑技术》 2024年第7期84-88,共5页
为研究干扰条件下串列方柱的风压特性及其流场机理,文中采用大涡模拟方法,探究不同宽度比施扰建筑的干扰下,受扰建筑周围流场和气动力的影响,并分析不同模型在雷诺数为22000,间距比为2.5时的气动力系数、平均风压系数以及流场分布特性... 为研究干扰条件下串列方柱的风压特性及其流场机理,文中采用大涡模拟方法,探究不同宽度比施扰建筑的干扰下,受扰建筑周围流场和气动力的影响,并分析不同模型在雷诺数为22000,间距比为2.5时的气动力系数、平均风压系数以及流场分布特性。结果表明两方柱的平均阻力方向相反,脉动阻力系数呈现先减后增,再减再增的规律;迎风面和背风面均表现为风吸力,侧立面有部分区域表现为风压力,平均风压系数极值随着宽度比的增加而增大;随着宽度比的增加,上游方柱剪切层的宽度增大。在5种不同宽度比下的干扰效应研究中,得出的结论是当宽度比为1.4时,遮挡效应最为明显。 展开更多
关键词 方柱流场 大涡模拟 气场系数 平均风压系数
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Acoustic Radiation of Damped Cylindrical Shell with Arbitrary Thickness in the Fluid Field 被引量:2
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作者 张俊杰 李天匀 +1 位作者 叶文兵 朱翔 《Journal of Marine Science and Application》 2010年第4期431-438,共8页
The insertion loss of acoustic radiation of damped cylindrical shell described by 3-D elasticity Navier equations under radial harmonic applied load in fluid is presented. The classical integral transform technique, p... The insertion loss of acoustic radiation of damped cylindrical shell described by 3-D elasticity Navier equations under radial harmonic applied load in fluid is presented. The classical integral transform technique, potential theory and Lamè resolution are used to derive the solutions of Navier equations. The higher precision inversion computation is introduced to solve the linear equations. Comparing with acoustic radiation of one-layer cylindrical shell, the influence of thickness, mass density, dilatational wave loss factor and Young's modulus of damping material and circumferential mode number of the cylindrical shell on the insertion loss is concluded. The theoretical model in the paper can be used to deal with the arbitrary thickness and any frequency of the coated layer in dynamic problem. The conclusions may be of theoretical reference to the application of damping material to noise and vibration control of submarines and underwater pipes. 展开更多
关键词 insertion loss acoustic radiation coated layer Lame resolution Helmholtz equation
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