使用荧光PIV表征喷雾诱导的湍流

2019/08/14   下载量： 0 次

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采用LaVision公司的DaVis图像采集和分析处理软件平台，结合激光诱导荧光技术对喷雾诱导的周围环境的湍流的速度场进行了实验测量和分析。研究了其流动特性。

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   The strong shear induced by the injection of liquid sprays at high velocities induces turbulence in the surrounding medium.This, in turn, influences the motion of droplets as well as the mixing of air and vapor. Using fluorescence-based tracer particle image velocimetry, the velocity field surrounding 125–135 m/s sprays exiting a 200-μ m nozzle is analyzed. For
the first time, the small- and large-scale turbulence characteristics of the gas phase surrounding a spray has been measured simultaneously, using a large eddy model to determine the sub-grid scales. This further allows the calculation of the Stokes numbers of droplets, which indicates the influence of turbulence on their motion. The measurements lead to an estimate of the dissipation rate  ≈ 35 m 2 s −3 , a microscale Reynolds number Re ≈ 170, and a Kolmogorov length scale of  ≈ 10−4 m. Using these dissipation rates to convert a droplet size distribution to a distribution of Stokes numbers, we show that only the large scale motion of turbulence disperses the droplet in the current case, but the small scales will grow in importance with increasing levels of atomization and ambient pressures.

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 燃气轮机燃烧室新型双相空气喷射器喷雾分布及燃料位置研究

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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