Velocity and temperature boundary layets in thermal turbulence and mean wind.

热湍流和平均风中的速度和温度边界层。

• 批准号: 18560162
• 负责人: TSUJI Yoshiyuki
• 金额: $ 2.37万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560162/
• 关键词: thermal turbulence; mean wind; scaling; thermal; velocity boundary laver; low Pr; 速度・温度境界層

Temperature and velocity fluctuations are measured simultaneously in thermal turbulence in a confined cell Temperature is measured by small thermister and velocity is measured by ultrasonic velocity profile monitor(UVP)and particle image velocimetory (PIV), respectively.Aspect ration is changed as 1.0, 2.0, 0.5.It was found that the mean wind was identified as the long-time average flow pattern, not an instantaneously observed. It is drove by thermal plumes generated close to the wall. But the pattern of plume oscillation strongly depends on the aspect ratio. Using the water and mercury as the working fluid, the Pr number dependence of plume characteristics are studied.Instantaneous flow pattern in water was investigated by PIV. The flow pattern is naturally tithe dimensional. it appears to be two-dimensional only when the long-time average is performed. Three dimensional Stir is depending on the plume oscillation, which is too complicated to clarify its statistics. Thermal and velocity boundary layers are affected by the mean wind. We continue to study this problem in the future.

在密闭容器中，采用小型热敏电阻测量温度，采用超声速度剖面仪（UVP）和粒子图像测速仪（PIV）分别测量速度和温度，纵横比分别为1.0，2.0，0.5。它是由靠近壁面产生的热羽流驱动的。但羽流振荡的模式强烈地依赖于长宽比。以水和汞为工质，研究了羽流特性随Pr数的变化规律，利用PIV技术研究了水中的瞬时流态。流动模式自然是十分之一维度的。只有当执行长时间平均时，它才看起来是二维的。三维搅动依赖于羽流振荡，这是太复杂，以澄清其统计。热边界层和速度边界层受平均风的影响。我们将在今后继续研究这一问题。

项目成果

Pressure Measurement in Turbulence 2

湍流中的压力测量 2

• 发表时间: 2007
• 作者: K. Mori;H. Imanishi;辻 義之;Y. Tsuji;辻 義之;Y. Tsuji
• 通讯作者: Y. Tsuji

高レイノルズ数乱流境界層における壁面せん断応力と圧力統計量のスケーリング

高雷诺数湍流边界层中壁剪应力和压力统计的缩放

• 发表时间: 2008
• 期刊: 西日本乱流研究会25周年記念特集号
• 作者: 河合勇太;辻 義之;辻 義之.
• 通讯作者: 辻 義之.

Scaling of Pressure and Wall Shear Stress in High-Reynolds Number Turbulent Boundary Layers

高雷诺数湍流边界层中压力和壁面剪应力的缩放

• 发表时间: 2008
• 期刊: Nishi-Nihon Ranryuu kennkyuukai 25 syunen kine tokusyuugou
• 作者: Yoshiyuki;Tsuji
• 通讯作者: Tsuji

チャネル乱流における大規模組織構造

通道湍流中的大尺度纹理

• 发表时间: 2008
• 作者: K. Mori;H. Imanishi;辻 義之
• 通讯作者: 辻 義之

Local Skinfriction Measurement of Flat-plate Boundary Layer using Towing Tank

利用拖曳水池测量平板边界层的局部表面摩擦力

• 发表时间: 2007
• 作者: H. Imanishi;K;Mori;Y. Tsuji
• 通讯作者: Y. Tsuji