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Effect Of Particle Size On Combustion Of Aluminum Particle Dust In Air

机译：粒径对空气中铝粉尘燃烧的影响

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The combustion of aluminum particle dust in a laminar air flow is theoretically studied under fuel-lean conditions. A wide range of particle sizes at nano and micron scales is explored. The flame speed and temperature distribution are obtained by numerically solving the energy equation in the flame zone, with the particle burning rate modeled as a function of particle diameter and ambient temperature. The model allows for investigation into the effects of particle size, equivalence ratio, and chemical kinetics on the burning characteristics and flame structures of aluminum-particle/air mixtures. In addition, the flame behavior with ultra-fine particles in the sub-nanometer range is examined by asymptotically treating particles as large molecules. Calculated flame speeds show reasonable agreement with experimental data. As the particle diameter decreases from the micron to the nano range, the flame speed increases and the combustion transits from a diffusion-controlled to a kinetically controlled mode. For micron-sized and larger particles, the flame speed can be correlated with the particle size according to a d~(-m) relationship, with m being 0.92. For nano-particles, a d~(-0.52) or d~(-0.13) dependence is obtained, depending on whether the d~(1.0)- or d~(0.3)-law of particle burning time is implemented in the flame model, respectively. No universal law of flame speed exists for the entire range of particle sizes.
机译：理论上在贫油条件下研究了层流中铝粉尘的燃烧。探索了纳米和微米级的各种粒径。火焰速度和温度分布是通过对火焰区域中的能量方程进行数值求解而获得的，其中颗粒燃烧速率是颗粒直径和环境温度的函数。该模型允许研究粒径，当量比和化学动力学对铝颗粒/空气混合物的燃烧特性和火焰结构的影响。另外，通过渐近地将颗粒视为大分子来检查亚纳米范围内的超细颗粒的火焰行为。计算出的火焰速度与实验数据显示出合理的一致性。随着粒径从微米减小到纳米范围，火焰速度增加，燃烧从扩散控制模式转变为动力学控制模式。对于微米级和更大的颗粒，火焰速度可以根据d〜（-m）关系与颗粒大小相关，其中m为0.92。对于纳米粒子，取决于火焰模型中是否执行了粒子燃烧时间的d〜（1.0）-或d〜（0.3）律，因此获得了ad〜（-0.52）或d〜（-0.13）依赖性。 ， 分别。对于整个粒径范围，没有普遍的火焰速度定律。

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