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首页> 外文期刊>Chemical Engineering Science >Influence of the mass flow rate of secondary air on the gas/particle flow characteristics in the near-burner region of a double swirl flow burner
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Influence of the mass flow rate of secondary air on the gas/particle flow characteristics in the near-burner region of a double swirl flow burner

机译：二次空气质量流量对双旋流燃烧器近燃烧器区域内气体/颗粒流动特性的影响

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摘要

The influence of the mass flow rate of secondary air on the gas/particle flow characteristics of a double swirl flow burner, in the near-burner region, was measured by a three-component particle-dynamics anemometer, in conjunction with a gas/particle two-phase test facility. Velocities, particle volume flux profiles, and normalized particle number concentrations were obtained. The relationship between the gas/particle flows and the combustion characteristics of the burners was discussed. For different mass flow rates of secondary air, annular recirculation zones formed only in the region of r/. d=0.3-0.6 at x/. d=0.1-0.3. With an increasing mass flow rate of secondary air, the peaks of the root mean square (RMS) axial fluctuating velocities, radial mean velocities, RMS radial fluctuating velocities, and tangential velocities all increased, while the recirculation increased slightly. There was a low particle volume flux in the central zone of the burner. At x/. d=0.1-0.7, the profiles of particle volume flux had two peaks in the secondary air flow zone near the wall. With an increasing mass flow rate of secondary air, the peak of particle volume flux in the secondary air flow zone decreased, but the peak of particle volume flux near the wall increased. In section x/. d=0.1-0.5, the particle diameter in the central zone of the burner was always less than the particle diameter at other locations.
机译：通过三组分颗粒动力学风速计结合气体/颗粒，测量了二次空气的质量流量对靠近燃烧器区域的双旋流燃烧器的气体/颗粒流动特性的影响。两阶段测试设备。获得了速度，颗粒体积通量分布图和归一化的颗粒数浓度。讨论了气体/颗粒流与燃烧器燃烧特性之间的关系。对于不同的二次空气质量流量，仅在r /区域形成环形再循环区域。 d ＝ 0.3-0.6，x /。 d ＝ 0.1-0.3。随着二次空气质量流量的增加，均方根（RMS）轴向波动速度，径向平均速度，RMS径向波动速度和切向速度的峰值均增加，而再循环量则略有增加。燃烧器中央区域的颗粒通量较低。在x /。 d ＝ 0.1-0.7，在壁附近的二次空气流动区域中，颗粒体积通量的轮廓具有两个峰。随着二次空气质量流量的增加，二次空气流动区的颗粒通量峰值减小，但壁附近的颗粒通量峰值增大。在x /部分。 d ＝ 0.1-0.5，燃烧器中心区域的粒径总是小于其他位置的粒径。

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