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首页> 外文期刊>Journal of aerospace engineering >Trajectory Measurements of a Horizontally Oriented Buoyant Jet in a Coflow Using Filtered Rayleigh Scattering
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Trajectory Measurements of a Horizontally Oriented Buoyant Jet in a Coflow Using Filtered Rayleigh Scattering

机译：使用滤波瑞利散射的同流中水平方向浮力射流的轨迹测量

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摘要

The filtered Rayleigh scattering technique was implemented to discern the mechanisms associated with trajectory and mixing characteristics of buoyant jets in the presence of a coflow. A continuous wave laser in conjunction with a high-speed camera and a molecular filter constituted the equipment needed to obtain near-field concentration measurements of a carbon dioxide jet within a coflow of air. The arrangement enabled carbon dioxide concentration measurements with and without the coflow at a sampling rate of 400 Hz. The time-averaged results demonstrate the significance that adding the coflow has on increasing the mixing rate, thus reducing the impact of the buoyant jet by flattening the jet trajectory. The effects of various flow parameters such as the jet velocity, the jet to coflow velocity ratio, the relative velocity between the jet and the coflow, and the Froude number on the jet trajectory are studied. The downward trajectory of the carbon dioxide jet, absent a coflow, was well correlated with the Froude number. However, the addition of the coflow led to a substantial impact on the jet trajectory, reducing its buoyant effects due to a combination of increased momentum and, likely, the mixing rate. Further increases in the coflow, including the relative magnitude of the coflow, had a lesser impact. Mixing characteristics and time-dependent jet motion were captured. (C) 2016 American Society of Civil Engineers.
机译：实施了滤波瑞利散射技术以识别与同流情况下浮力射流的轨迹和混合特性相关的机理。连续波激光器与高速照相机和分子滤镜相结合，构成了获得气流同流中二氧化碳射流近场浓度测量所需的设备。该布置能够以400 Hz的采样率在有和没有同流的情况下进行二氧化碳浓度测量。时间平均的结果表明添加同流对提高混合速率具有重要意义，因此可以通过使射流轨迹变平来减小浮力射流的影响。研究了射流速度，射流与同流速度之比，射流与同流之间的相对速度以及弗洛德数对射流轨迹等各种流动参数的影响。没有顺流的二氧化碳射流的向下轨迹与弗洛德数高度相关。但是，增加同流会导致对射流轨迹的实质性影响，由于动量增加以及混合速度增加的共同作用，降低了其浮力效应。 coflow的进一步增加（包括coflow的相对大小）的影响较小。捕获了混合特性和随时间变化的喷射运动。 （C）2016年美国土木工程师学会。

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  • 来源
    《Journal of aerospace engineering》 |2017年第1期|04016067.1-04016067.11|共11页
  • 作者

    Benhassen Firas; Polanka Marc D.; Reeder Mark F.;

  • 作者单位

    Air Force Inst Technol, Dept Aeronaut Engn, Wright Patterson AFB, OH 45433 USA;

    Air Force Inst Technol, Dept Aeronaut Engn, Wright Patterson AFB, OH 45433 USA;

    Air Force Inst Technol, Dept Aeronaut Engn, Wright Patterson AFB, OH 45433 USA;

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