Replacement for the failed LDV system at University of Windsor

更换温莎大学发生故障的 LDV 系统

• 批准号: RTI-2020-00038
• 负责人: Balachandar, Ramaswami
• 金额: $ 8.21万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=692984
• 关键词: Replacement; failed; LDV; system; University

Measurements of velocity and turbulence are required to properly model both internal and external flows. These include flow in rivers, effluent discharge of wastewater, flow past buildings, etc. In most cases, these flows are three dimensional and turbulent, which means the mixing is largely due to small scale chaotic behaviour of the fluid where the velocity fields are varying in space and time. The ability to model these flows and the associated transport phenomena is of critical importance in many applications. Research in the above areas is in progress at the University of Windsor and significant contributions have been made over the last 15 years using a laser Doppler Velocimeter (LDV) system. Velocity data acquired from the LDV system have provided valuable information for complementary validation of computational models of complex flow fields. The LDV was the principal tool used in many graduate theses.******The LDV system at University of Windsor was purchased in 2003. It was our workhorse and a large number of HQP were trained in the use of the system for over 15 years. Currently the LDV system is obsolete due to the complete deterioration of the system. The air-cooled laser has been replaced twice in the past in 2006 and 2009, and is no longer in operation. In 2012, after a decade of extensive usage, the software was updated to comply with the newer computer operating system. Now the lack of availability of hardware components compatible with modern computer operating systems has also become an issue. Over the years, the fiber optic cables have deteriorated and the processor used to extract the data has perished. The manufacturer has indicated that replacement parts are not available and some of the parts, if available are very expensive. Our previous two RTI applications related to the LDV were not funded and the need for funding cannot be over-emphasized.******The proposed equipment grant is requested to support the replacement of the now defunct LDV system. Funds are sought for a new LDV system that is capable of resolving two velocity components and facilitate measurements in air and water. There is an immediate need for purchasing this system as our students from two departments need the LDV capability. Availability of the LDV technology is critically important in the investigation of turbulence structure of free surface flows, 3D jets, wakes and fluid-structure interaction. In the immediate future, the equipment will be used in the following projects: Experimental study of self-aerated free surface flows (2 PhD, 2 MASc); energy exchange between flapping/bending structures (2 MASc); scour studies (1 PDF); cooling applications of impinging jets (1 PhD); bed roughness in open channels (1 PhD). As in the past, the capability to conduct the above studies will enhance our ability to procure additional funding from industrial research partners in Windsor.*****

需要测量速度和湍流才能正确模拟内部和外部流动。这些包括河流中的流动、废水排放、流经建筑物等。在大多数情况下，这些流动是三维的和湍流的，这意味着混合很大程度上是由于速度场变化的流体的小规模混沌行为造成的在空间和时间上。对这些流动和相关传输现象进行建模的能力在许多应用中至关重要。温莎大学正在进行上述领域的研究，并在过去 15 年中使用激光多普勒测速仪 (LDV) 系统做出了重大贡献。从 LDV 系统获取的速度数据为复杂流场计算模型的补充验证提供了有价值的信息。 LDV 是许多研究生论文中使用的主要工具。******温莎大学的 LDV 系统于 2003 年购买。它是我们的主力，大量 HQP 接受了超过 1 年的系统使用培训。 15 年。 目前，由于系统完全退化，LDV 系统已过时。风冷激光器曾于2006年和2009年更换过两次，现已不再运行。 2012 年，经过十年的广泛使用，该软件进行了更新，以适应较新的计算机操作系统。现在，缺乏与现代计算机操作系统兼容的硬件组件也成为一个问题。多年来，光纤电缆已经老化，用于提取数据的处理器也已损坏。 制造商表示无法提供替换零件，并且某些零件（即使有）也非常昂贵。我们之前两项与 LDV 相关的 RTI 申请均未获得资助，资金的必要性怎么强调都不为过。****** 拟议的设备拨款用于支持更换现已废弃的 LDV 系统。正在为新的 LDV 系统寻求资金，该系统能够解析两个速度分量并促进空气和水中的测量。由于我们两个系的学生需要 LDV 功能，因此迫切需要购买该系统。 LDV 技术的可用性对于自由表面流的湍流结构、3D 射流、尾流和流固耦合的研究至关重要。在不久的将来，该设备将用于以下项目： 自曝气自由表面流的实验研究（2名博士，2名硕士）；扑动/弯曲结构之间的能量交换（2 MASc）；冲刷研究（1 PDF）；冲击射流的冷却应用（1 名博士）；明渠中的河床粗糙度（1 名博士）。与过去一样，进行上述研究的能力将增强我们从温莎工业研究合作伙伴那里获得额外资金的能力。*****