方案摘要
方案下载应用领域 | 其他 |
检测样本 | 其他 |
检测项目 | |
参考标准 | 暂无 |
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。
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.
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