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Experimental study and numerical simulation of impact factors on spray impingement of urea water solution

机译：尿液水溶液喷雾撞击影响因素的实验研究与数值模拟

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摘要

The impingement behavior is inevitable during the injection process of urea water solution in selective catalytic reduction aftertreatment system of diesel engine. The impingement contributes to the formation of liquid film on the pipe wall and mixer, and it will block the pipe and reduce the urea water solution decomposition efficiency. In this work, the morphological changes of the spray during the impingement process were captured by the CCD camera. The liquid film development under different injection flow rates, compressed air pressures, injection heights, injection angles and metal wall temperatures were simulated and analyzed by AVLFIRE. A good agreement with the experiment results is achieved. The results indicate that the liquid film area increases with higher injection flow rate, compressed air pressure, injection height and lower injection angle. According to Kuhnke model, the behaviors of impingement droplets are dominated by the sub-velocity of droplets which is affected by the injection flow rate and injection angle. Higher metal wall temperature can promote the evaporation of the liquid film and droplets, which reduces the liquid film area. It is an effective way to prevent the liquid film formation through rising the metal wall temperature.
机译：柴油发动机选择性催化还原后处理系统中尿素水溶液注射过程中的冲击行为是不可避免的。撞击有助于在管壁和混合器上形成液体膜，并且它会阻断管道并降低尿素水溶液分解效率。在这项工作中，通过CCD相机捕获冲击过程中喷雾的形态变化。通过AVLFIRE模拟和分析了不同喷射流速下的液体膜显影，压缩空气压，喷射高度，注射角度和金属壁温度。实现了与实验结果的良好一致性。结果表明，液体膜面积随着较高的喷射流速，压缩空气压力，喷射高度和下喷射角度而增加。根据Kuhnke模型，冲击液滴的行为由受喷射流速和注射角度影响的液滴的子速度为主。更高的金属壁温可以促进液体膜和液滴的蒸发，这减少了液体膜面积。通过上升金属壁温度，是防止液体膜形成的有效方法。

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  • 来源
    《Heat and mass transfer》 |2020年第7期|2239-2254|共16页
  • 作者

    Jun Wang; Hang Fu; Yipan Hu; Yixi Cai; Kerui Chen;

  • 作者单位

    Jiangsu University School of Automotive and Traffic Engineering Zhenjiang 212013 China;

    Jiangsu University School of Automotive and Traffic Engineering Zhenjiang 212013 China;

    Jiangsu University School of Automotive and Traffic Engineering Zhenjiang 212013 China;

    Jiangsu University School of Automotive and Traffic Engineering Zhenjiang 212013 China;

    Jiangsu University School of Automotive and Traffic Engineering Zhenjiang 212013 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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