湍流多组分喷流中流速和标量浓度的测量：不对称性和浮力效应

2019/07/19   下载量： 0 次

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应用领域 其他
检测样本 其他
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参考标准 暂无

采用LaVision公司的DaVis8.4软件平台，结合脉冲Nd:YAG激光器，CCD相机和ICCD相机，构成了一套同时测量喷雾流体速度场和浓度场的测试系统。并利用这一系统对湍流多组分喷流中流速和标量浓度进行了测量，并分析了不对称性和浮力效应。

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     Buoyancy effects and nozzle geometry can have a significant impact on turbulent jet
dispersion. This work was motivated by applications involving hydrogen. Using helium
as an experimental proxy, buoyant horizontal jets issuing from a round orifice on the side
wall of a circular tube were analysed experimentally using particle image velocimetry
(PIV) and planar laser-induced fluorescence (PLIF) techniques simultaneously to provide
instantaneous and time-averaged flow fields of velocity and concentration. Effects of buoyancy and asymmetry on the resulting flow structure were studied over a range of Reynolds numbers and gas densities. Significant differences were found between the
centreline trajectory, spreading rate, and velocity decay of conventional horizontal round
axisymmetric jets issuing through flat plates and the pipeline leak-representative jets
considered in the present study. The realistic pipeline jets were always asymmetric and
found to deflect about the jet axis in the near field. In the far field, it was found that the
realistic pipeline leak geometry causes buoyancy effects to dominate much sooner than
expected compared to horizontal round jets issuing through flat plates.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 利用粒子图像测速，本征正交分解和速度相关表征高粗糙度表面流动结构

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北京欧兰科技发展有限公司
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