Laser doppler velocimetry (LDV) system

工业设备中的许多流动，无论是在核反应堆中、在喷气发动机中还是在简单的管道系统中，都是复杂的，往往涉及高频的速度波动。在许多情况下，这些速度波动会产生不利影响，例如能量损失、工艺效率降低、无法接受的高噪声水平或可能导致疲劳失效的过度振动。为了在不影响其安全运行的前提下提高所涉及设备的性能，有必要对其流动特性进行研究和优化。所要求的激光多普勒测速(LDV)系统是一种非侵入式流动测量工具，可以在不干扰流场的情况下测量两个速度分量，特别是在测量不稳定的薄剪切层或壁面边界层时。LDV可以在这些情况下提供可靠的测量，即使在光学访问测量位置非常有限的情况下也是如此。所要求的LDV系统是一种通用的流量测量工具，可用于广泛的研究和开发项目，包括具有高频率波动的高速非定常流动。所要求的仪器将由至少五个研究小组的研究生使用，这些研究小组从事各种与加拿大工业和经济相关的稳定和非稳定流动项目。因此，收购该仪器将大大提高五个研究小组的能力和效率，促进我们对复杂的稳定和非稳定流动的基本了解，改善我们在设计高效和安全的流体处理设备方面的专业知识，并有助于培训高素质的人员。

Many flows in industrial equipment, whether in a nuclear reactor, in a jet engine or in a simple piping system, are complex and often involve velocity fluctuations at high frequencies. In many cases, these velocity fluctuations produce unfavorable effects, such as energy losses, reduced process efficiency, unacceptably high noise levels, or excessive vibrations which may cause fatigue failure. In order to enhance the performance of the equipment involved, without compromising their safe operation, it is necessary to investigate and optimize their flow characteristics. The requested Laser Doppler Velocimetry (LDV) system is a non-intrusive flow measurement tool that can measure two velocity components without disturbing the flow field, especially when measuring unstable thin shear layers or wall boundary layers. LDV can provide reliable measurements in these situations even when the optical access to the measurement location is very limited. The requested LDV system is a versatile flow measurement tool and can be used in a wide range of research and development projects, including challenging high speed unsteady flows exhibiting high frequency fluctuations. The requested instrument will be used by the graduate students of at least five research groups working on various steady and unsteady flow projects, which are relevant to Canadian industry and the economy. The acquisition of this instrument will therefore contribute substantially to enhancing the capability and efficiency of five research groups, to advancing our fundamental understanding of complex steady and unsteady flows, to improving our expertise in designing efficient and safe fluid handling equipment, and to the training of highly qualified personnel.