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首页> 外文会议>Optical Measurement Systems for Industrial Inspection IV pt.2 >Methods based on one component Laser Doppler Anemometer and Hot Film Anemometer for three dimensional turbulent measurements
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Methods based on one component Laser Doppler Anemometer and Hot Film Anemometer for three dimensional turbulent measurements

机译：基于一分量激光多普勒风速仪和热膜风速仪的三维湍流测量方法

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摘要

In the of three turbulent statistics with one measurement. The application of the present technique is conducted on fully developed uniform open channel turbulent flow and present study, an experimental investigation is conducted for the research of the turbulent open channel flow field at the three directions with the aid of one component Laser Doppler Anemometer and x Hot Film sensors. The instrumentation is used in an efficient manner for the extraction on flow with suction from the bed. With the aid of assumption for zero correlation between velocity and direction fluctuations the required number of measurements in the plane of flow direction for turbulent statistics is reduced. Using the Hot film sensor in the streamwise- spanwise orientation and with the LDA beam plane inclined in streamwise - vertical plane for the extraction a component of streamwise velocity direction, the three turbulent statistics are estimated. Also, with the assumption of randomness of velocity fluctuations of the open channel flow in the zero correlation assumption, the dependence of turbulent statistics with the angle is possible to be calculated. The influence of suction from the bed on the uniform open channel flow, alters the turbulent flow field characteristics and in the present paper the distribution of turbulent intensities are presented for various suction rates in the flow depth. In the form of covariance and autocovariance, angle dependence is examined for uniform flow and for flow with suction from the bed.
机译：在一次测量的三个湍流统计中。本技术的应用是在充分发展的均匀明渠湍流上进行的，目前的研究是借助单分量激光多普勒风速计和x进行三个方向的湍流明渠流场研究的实验研究。热膜传感器。该仪器被有效地用于从床中抽吸抽吸流动。借助于速度和方向波动之间的零相关性的假设，减少了用于湍流统计的流动方向平面中所需的测量次数。使用沿流向-跨度方向的热膜传感器，并在沿流向-垂直平面倾斜的LDA光束平面中提取流向速度方向的分量，可以估算出三个湍流统计量。而且，在零相关假设下，假设明渠水流速度波动的随机性，可以计算出湍流统计量与角度的相关性。来自床层的吸力对均匀的明渠水流的影响，改变了湍流场的特性，在本文中，针对流动深度中的各种吸力率，给出了湍流强度的分布。以协方差和自协方差的形式，检查角度相关性，以确保均匀流和吸自床的流。

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