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首页> 外文期刊>Acta astronautica >Numerical investigation of the effects of gas-liquid ratio on the spray characteristics of liquid-centered swirl coaxial injectors
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Numerical investigation of the effects of gas-liquid ratio on the spray characteristics of liquid-centered swirl coaxial injectors

机译：气液比对液体旋流同轴注射器喷射特性影响的数值研究

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摘要

We investigate the effects of gas-liquid ratio (GLR) on the spray and atomization process of a liquid-centered swirl coaxial injector using the coupled level-set and volume of fluid (CLSVOF) method. The flow field, gas-liquid interaction, and breakup of liquid film during adaptive mesh refinement are evaluated and analyzed. The results show that, with the increase of GLR, the atomization process becomes dominated successively by the instability of the liquid film, strong gas-liquid interaction and spray self-pulsation. Moreover, more droplets are found near the center of the spray cone while the spray angle decreases. The inclined surface waves on the liquid film may be formed owing to Rayleigh-Taylor instability. When GLR is relatively large, holes are produced and break up on the liquid film due to the high velocity of the gas. Then, the gas-liquid interaction pushes small droplets towards the center of the spray cone, while large droplets and ligaments distribute on the periphery of the spray. With even larger GLRs, self-pulsation occurs, which is found to determine the flow structures inside the spray cone and to generate, shed and dissipate vortices periodically. Furthermore, when self-pulsation occurs, the near-field pressure and mass flow rate fluctuations increase rapidly.
机译：我们研究气液比（GLR）对使用耦合水平设定和流体（CLSVOF）方法的液上涡流同轴注射器的喷雾和雾化过程的影响。评估和分析了自适应网格细化期间液体膜的流场，气液相互作用和分解。结果表明，随着GLR的增加，雾化过程通过液体膜的不稳定性，强气液相互作用和喷涂自脉冲的不稳定性地呈主导。而且，在喷射角度下，在喷涂锥的中心附近找到更多液滴。由于瑞利 - 泰勒不稳定性，可以形成液体膜上的倾斜表面波。当GLR相对较大时，由于气体的高速，产生孔并在液体膜上分解。然后，气液相互作用将小液滴推向喷雾锥的中心，而大滴和韧带在喷雾的周边上分布。对于甚至更大的GLR，发生自脉冲，发现其确定喷雾锥内部的流动结构并定期产生，脱落和散发涡流。此外，当发生自脉冲时，近场压力和质量流量波动迅速增加。

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