Replacement of laser and PM tubes in the laser doppler velocimeter system at the university of windsor

温莎大学激光多普勒测速仪系统中激光管和保偏管的更换

• 批准号: 345083-2007
• 负责人: Balachandar, Ramaswami
• 金额: $ 1.76万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=325684
• 关键词: Replacement; laser; PM; tubes; doppler

Discharging water, wastewater and industrial effluents (liquids & gases) into the natural system such as rivers, lakes, oceans and the atmosphere is a major way of disposing pollutants.  The ability to model these flow systems and the associated transport is of critical importance in environmental applications.  In most cases, the flows are turbulent, which means the mixing is largely due to small-scale chaotic behaviour of the fluid.  The mass transport and dilution of pollutants is essentially controlled by turbulence.  The flow fields are complex with the flow changing direction quite often.  To better understand and control many of the above mentioned processes, knowledge of the velocity field is an essential ingredient.  Research in this area is progress at the University of Windsor and a significant contribution has been made over the last five years using a laser Doppler velocimeter (LDV).  The LDV system has unique advantages: non-invasiveness, no calibration, no drift, very fast data acquisition and importantly, the LDV system can detect changes in flow direction. The proposed equipment grant is requested to support the replacement of the laser and the photomultiplier (PM) tubes in the existing LDV system.  The LDV system was purchased five years ago with a 300 m-W air-cooled laser and two PM tubes at a cost of $ 100,000.  The LDV system is used extensively by students, visiting faculty, post-doctoral fellows and faculty members at the University of Windsor.  Seven students have completed their theses in the past three years. The laser, which has a limited life was refurbished two years ago.  Presently the system is non-operable due to the failure of the laser and the two PM tubes.  Both these components are consumable items and need to be replaced.  There is an immediate need for this as four students from two departments need to use the system for the following projects: effect of roughness in open channel flows, (2 PhD students), hydraulic model studies (1 MASc student) and jet studies ( 1 MASc student)

排放水、废水和工业废水污染物（液体和气体）进入自然系统（如河流、湖泊、海洋和大气）是处理污染物的主要方式。模拟这些流动系统及其相关传输的能力在环境应用中至关重要。在大多数情况下，流动是湍流的，这意味着混合很大程度上是由于小-流体的尺度混沌行为。污染物的质量传输和稀释基本上是由湍流控制的。流场是复杂的，流动经常改变方向。为了更好地了解和控制上述许多过程，速度场的知识是必不可少的组成部分。温莎大学在这一领域的研究取得了进展，在过去的五年里，使用激光多普勒测速仪（LDV）做出了重大贡献。LDV系统具有独特的优势：非侵入性、无校准、无漂移、非常快速的数据采集，重要的是，LDV系统可以检测流动方向的变化。申请拨款的目的是更换现有激光多普勒测速系统的激光器和光电倍增管。激光多普勒测速系统是五年前购置的，包括一台300兆瓦的气冷激光器和两个光电倍增管，费用为100，000美元。激光多普勒测速系统广泛应用于学生、访问教师、温莎大学的博士后研究员和教员。在过去的三年里，有七名学生完成了他们的论文。激光器的使用寿命有限，两年前已进行翻新。目前，由于激光器和两个PM管出现故障，系统无法运行。这两个部件都是消耗品，需要更换。由于来自两个部门的四名学生需要使用系统进行以下项目，因此迫切需要更换：明渠水流中粗糙度的影响，（2名博士生），水力模型研究（1名硕士生）和射流研究（1名硕士生）