Characteristics of unsteady turbulent boundary layr with separated vortices

分离涡非定常湍流边界层特征

• 批准号: 08455476
• 负责人: SUZUKI Toshio
• 金额: $ 4.93万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455476/
• 关键词: large roughness; inertia force in waves; viscous force in waves; area density of roughness; effective projected diameter; unsteady motions; Ship model wake; longitudinal vortices; 船尾境界層; 慣性力

Characteristics of unsteady turbulent boundary layr with separated vortices were investigated. Three kinds of flow field were measured experimentally.1. Flow behind large roughness in thin boundary layr.2. Flow around a circular cylinder in waves.3. Flow behind two kinds of ship stern, fine ship model and full ship model.Obtained results are as follows ;1. When the area density of roughness exceed 15% of surface of a cylinder effective diameter of the cylinder with roughness close to the reference diameter Dr=D+2K (D : diameter of cylinder, K : roughness height).2. Roating flow are observed when a circular cylinder was arranged under the wave surface and settled parallel to the crest line.3. Analyzed inertia force and viscous force show different characteristics in wave or oscillating motions, but non-dimensional coefficients are almost the same values.4. There are some correlation between variation of 3-d longitudinal vortices and wake distributions of fine ship model at low frequency harmonics.5. Stronger longitudinal vortices make the wake distribution behind a full hull form model ship stable.

研究了具有分离涡旋的不稳定湍流边界Layr的特征。实验测量了三种流场1。在薄边界Layr.2中的大粗糙度后面流动。在波浪中流动圆形圆柱体3。在两种船尾，精美的船舶模型和完整的船舶模型后面流动。结果如下； 1。当粗糙度的面积密度超过圆柱体表面的15％时，圆柱体的有效直径，粗糙度接近参考直径dr = d+2k（d：圆柱体的直径，k：粗糙度高度）.2。当将圆柱体排列在波形表面并平行于波峰线时，观察到流行流。3。分析的惯性力和粘性力在波浪或振荡运动中显示出不同的特征，但非二维系数几乎是相同的值。4。在低频谐波下，3-D纵向涡旋的变化与精细船舶模型的唤醒分布之间存在一些相关性。5。更强的纵向涡流使整个船体形式型船稳定后面的唤醒分布。

项目成果

Hiroyoshi SUZUKI,Toshio SUZUKI,Satoshi MIYAZAKI: "Turbulence Measurements in a Stern Flow Field of a Ship Model -Series 60, CB=0.6-" Journal of the Kansai Society of Naval Architects, Japan. No.227. 29-40 (1997)

Hiroyoshi SUZUKI、Toshio SUZUKI、Satoshi MIYAZAKI：“船舶模型尾流场中的湍流测量 - 系列 60，CB=0.6-”日本关西造船学会杂志。

Hiroyoshi SUZUKI,Satoshi MIYAZAKI,Toshio SUZUKI,Kiyoshige MATSUMURA: "Turbulence in Stern Flow Fields around a Oblique Ship Model" Proceedings of the Kansai Society of Naval Architects, Japan. Vol.10 (in print). (1998)

Hiroyoshi SUZUKI、Satoshi MIYAZAKI、Toshio SUZUKI、Kiyoshige MATSUMURA​​：“斜船模型周围船尾流场中的湍流”日本关西造船学会论文集。

鈴木博善: "模型船船尾まわりの乱動計測-シリーズ60,CB=0.6-" 関西造船協会誌. 227. 29-40 (1997)

Hiroyoshi Suzuki：“模型船尾部湍流的测量 - Series 60，CB=0.6-”关西造船协会杂志 227. 29-40 (1997)。

鈴木 博善: "模型船船尾まわりの乱動計測-シリーズ60.CB=0.6-" 関西造船協会誌. 227. 29-40 (1997)

Hiroyoshi Suzuki：“模型船尾部湍流的测量 - Series 60.CB=0.6-”关西造船协会杂志 227. 29-40 (1997)。

鈴木博善: "模型船船尾まわりの乱動計測-龍光丸、ハンブルグテストケース-" 関西造船協会誌. 230. (1998)

Hiroyoshi Suzuki：“模型船尾部湍流的测量 - Ryukou Maru，汉堡测试案例 -”关西造船协会杂志 230。（1998）