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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation of turbulence modulation in particle-laden coaxial jets by Phase Doppler Anemometry
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Experimental investigation of turbulence modulation in particle-laden coaxial jets by Phase Doppler Anemometry

机译：相位多普勒风速计在含粒子同轴射流中湍流调制的实验研究

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摘要

The effect of solid particles on the flow characteristics of axisymmetric turbulent coaxial jets for two flow conditions was studied. Simultaneous measurements of size and velocity distributions of continuous and dispersed phases in a two-phase flow are presented using a Phase Doppler Anemometry (PDA) technique. Spherical glass particles with a particle diameter range from 102 to 212 p.m were used in this two-phase flow, the experimental results indicate a significant influence of the solid particles and the Re on the flow characteristics. The data show that the gas phase has lower mean velocity in the near-injector region and a higher mean velocity at the developed region. Near the injector at low Reynolds number (Re = 2839) the presence of the particles dampens the gas-phase turbulence, while at higher Reynolds number (Re = 11 893) the gas-phase turbulence and the velocity fluctuation of particle-laden jets are increased. The particle velocity at higher Reynolds number (Re = 11893) and is lower at lower Reynolds number (Re = 2839). The slip velocity between particles and gas phase existed over the flow domain was exam_ined. More importantly, the present experiment results suggest that, consideration of the gas character_istic length scales is insufficient to predict gas-phase turbulence modulation in gas-particle flows.
机译：研究了固体颗粒对两种流动条件下轴对称湍流同轴射流流动特性的影响。使用相多普勒风速仪（PDA）技术，可以同时测量两相流中连续相和分散相的大小和速度分布。在这种两相流中，使用了直径范围为102至212 p.m的球形玻璃颗粒，实验结果表明，固体颗粒和Re对流动特性有重大影响。数据表明，气相在注入附近区域具有较低的平均速度，而在发育区域具有较高的平均速度。在雷诺数低（Re = 2839）的喷油器附近，颗粒的存在会抑制气相湍流，而在雷诺数较高（Re = 11 893）的情况下，气相湍流和载有颗粒的射流的速度波动较大。增加。雷诺数较高时（Re = 11893）的粒子速度，雷诺数较低时（Re = 2839）的粒子速度较低。检查了流域内存在的颗粒与气相之间的滑移速度。更重要的是，本实验结果表明，考虑气体特征长度尺度不足以预测气体颗粒流中的气相湍流调制。

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