Particle image velocimetry system upgrade

粒子图像测速系统升级

• 批准号: 359062-2008
• 负责人: Bugg, James
• 金额: $ 5.45万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=363844
• 关键词: Particle; image; velocimetry; system; upgrade

Particle image velocimetry (PIV) is an experimental fluid dynamics research tool capable of measuring the velocity in a flow at several thousand points simultaneously.  This is achieved by seeding the flow with light-reflecting particles and illuminating a plane in the flow with pulsed light produced by a laser.  A digital camera acquires two images of this plane a very short time apart.  Proper processing of these images reveals the velocity of the fluid by measuring the distance travelled by the particles between the two pictures.  Detailed information about the velocity field, such as that provided by PIV, is the most powerful tool for interpreting flow behaviour and guiding intelligent design decisions for engineering equipment.The particular focus of this grant is to expand an existing PIV system to allow world-class measurements to be made.  To more completely characterise a flow, it is important to measure how the velocity changes from place to place in the flow.  This grant will add the necessary equipment to our existing PIV facilities to allow measurements to be made on two planes simultaneously.  Relationships between PIV measurements on two different planes will allow information to be extracted that will be the first of its kind in many applications.  Examples of investigations currently underway or being planned are: the transient motion of bubbles and particles near walls, two-phase flow in tubes, rough-wall turbulent boundary layer measurements, confined jets, and wall jets.  These flows have application in aerodynamics, power generation, environmental dispersion modelling, and many other industrial processes.

粒子图像测速 (PIV) 是一种实验流体动力学研究工具，能够同时测量数千个点的流动速度。  这是通过在流中植入反光粒子并用激光产生的脉冲光照射流中的平面来实现的。  数码相机在很短的时间内获取该平面的两张图像。  对这些图像的正确处理通过测量两张图片之间的粒子行进的距离来揭示流体的速度。  有关速度场的详细信息（例如 PIV 提供的信息）是解释流动行为和指导工程设备智能设计决策的最强大工具。这笔赠款的特别重点是扩展现有的 PIV 系统，以实现世界一流的测量。  为了更全面地表征流动，测量流动中不同位置的速度变化非常重要。  这笔赠款将为我们现有的 PIV 设施添加必要的设备，以便能够同时在两架飞机上进行测量。  两个不同平面上的 PIV 测量之间的关系将允许提取信息，这在许多应用中都是此类的首次。  目前正在进行或计划进行的研究示例有：壁附近气泡和颗粒的瞬态运动、管内两相流、粗糙壁湍流边界层测量、受限射流和壁射流。  这些流动可应用于空气动力学、发电、环境扩散建模和许多其他工业过程。