Acquisition of Two-Dimensional Flowlite Laser Doppler Anemometer

摘要：该奖项授予库珀科学与艺术促进联盟，用于为阿尔伯特·纳肯工程学院流体实验室购买二维Flowlite激光多普勒风速计（LDA）。首席研究员Joseph Cataldo是土木工程教授，他将使用这些设备进行热羽、射流动力学和颤振的实验，这些研究领域目前正在进行或计划与本研究项目相关。LDA的多功能性将为教师和学生提供机会，以建立工程学院在流体动力学方面的研究，这已经进行了30多年。学校的流体实验室已经成为以下主题的实验场所：1)电厂热羽流的静态和动态效应；2)热锋；3)湖泊水夹带成排放羽流的模式化和定量化；4)组合污水溢流分层流；5)监测含水层中的石油污染；6)表面波与射流的相互作用；7)轴对称湍流射流中夹带的流动显示和径向速度测量；8)射流雷诺数的研究；9)混乱;10)射流低雷诺数；11)流体动力颤振。在颤振实验中，激光将为通过和围绕振荡板的复杂二维和三维行为开辟新的研究领域。在低雷诺数、表面波与射流的相互作用以及夹带流条件下，可以确定射流实验中的雷诺数应力。此外，采用Flowlite系统可以确定热锋的运动。目前正在使用热丝探针。目前LDA的尺寸、重量和一维流量限制使其无法获得全面的二维和三维流量测量。所提出的Flowlite LDA可以测量速度流的X， Y， Z位置并跟踪锋面的运动。当前系统的一个障碍是，我们的研究生在上课时间几乎不间断地使用它，这使得几乎不可能安排它用于向我们的本科生演示流体现象。收购Flowlite LDA系统意味着我们的本科生也将有一个LDA用于他们的学期实验室项目。此外，获得该仪器使我们能够在必修的本科课程中使用激光器进行演示和实验。最重要的是，新的LDA将加强土木和机械工程之间正在进行的合作（例如，前面提到的颤振实验是在流体实验室附近的机械工程实验室的风洞中进行的），使我们的机械工程专业的学生有可能与我们的土木工程专业的学生进行联合项目。Flowlite LDA的移动性和轻量化使其成为一种便携式系统；而且几乎不需要维护。

Abstract:This award to The Cooper Union for the Advancement of Science and Art is for the purchase of a Two-Dimensional Flowlite Laser Doppler Anemometer (LDA) for the Fluids Laboratory of the Albert Nerken School of Engineering. The Principal Investigator Joseph Cataldo, Professor of Civil Engineering, will use the equipment in connection with experiments in thermal plume, jet dynamics, and flutter, areas of research that are presently being conducted or are planned in connection with this research program.The versatility of the LDA will provide faculty and students with the opportunity to build on the engineering school's research in hydrodynamics, which it has been conducting for over three decades. The school's Fluids Laboratory has been the setting for experiments on such topics as: 1) static and dynamic effects of power plant thermal plumes; 2) thermal fronts; 3) patternization and quantification of the lake water entrainment into a discharge plume; 4) stratified flow in combined sewage overflow; 5) monitoring petroleum contamination in an aquifer; 6) interaction of surface waves and a jet; 7) flow visualization and radial velocity measurements of entrainment in an axisymmetric turbulent jet; 8) the study of Reynolds number on a jet; 9) chaos; 10) low Reynolds number in a jet; and, 11) hydrodynamic flutter.The laser will be used to open up new areas of research into complex two- and three-dimensional behavior through and around oscillating plates in the flutter experiment. The Reynolds stress in the jet experiments can be determined for low Reynolds numbers, surface wave interaction with the jet and entrainment flows. Also the movement of the thermal fronts can be determined with the proposed Flowlite system. The hot wire probe is presently being used. The size, weight and one dimensional flow limitation of the present LDA makes it impossible to obtain comprehensive two- and three- dimensional flow measurements. The proposed Flowlite LDA can measure X, Y, Z positions of the velocity flows and trace the movement of the fronts.One of the impediments of the current system is that it is used almost continuously during school hours by our graduate students, making it nearly impossible to schedule its use for demonstrations of fluid phenomenon to our undergraduate students. The acquisition of the proposed Flowlite LDA system means that our undergraduate students will also have an LDA for their term laboratory projects. Moreover, acquisition of the instrument enables us to have available a laser for demonstration and experiments in required undergraduate courses. Most important, the new LDA will enhance ongoing collaborations between civil and mechanical engineering (e.g., the aforementioned flutter experiment was conducted in the wind tunnel in the Mechanical Engineering Laboratory adjacent to the Fluids Laboratory), making it possible for our mechanical engineering students to conduct joint projects with our civil engineering students. The improved mobility and lightweight of the Flowlite LDA make it virtually a portable system; and it is virtually maintenance free.