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Binary collision of CMAS droplets-Part Ⅰ: Equal-sized droplets

机译：CMAS液滴的二进制碰撞 - 第Ⅰ部分：相等大小的液滴

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摘要

This study focuses on binary droplet collisions of equal calcium-magnesium-aluminosilicate (CMAS) droplets formed by the melting of dust and sand ingested by gas turbine engines. Head-on, off-center, and grazing collision of 1 mm CMAS droplets traveling toward each other at a relative velocity of 100 m/s are numerically investigated using a volume-of-fluid-based direct numerical simulation approach at operating pressure and temperature of 20 atm and 1548 K, respectively. It is found that head-on and off-center collisions lead to droplet coalescence, whereas stretching behavior is observed for the grazing configuration. To elucidate the effect of viscosity, a fictitious fluid with all properties the same as CMAS except for viscosity (1/10 of CMAS) is also studied. It is found that the lower viscosity liquid deforms significantly as compared to CMAS for the head-on and off-center cases. These differences are quantified using the budgets of kinetic, surface, and dissipation energies. This paper represents the first study of its kind on the binary collision of CMAS droplets.
机译：本研究重点介绍通过燃气涡轮发动机摄取的灰尘和砂熔化形成的等钙 - 镁 - 铝硅酸盐（CMA）液滴的二进制液滴冲突。在运行压力和温度下，使用流体体积的直接数值模拟方法在数量上研究了1mm CMAS液滴的头部，偏离中心和放牧碰撞。分别为20个ATM和1548 k。结果发现，头部和偏离中心碰撞导致液滴聚结，而伸展行为被观察到放牧配置。为了阐明粘度的影响，还研究了除了除粘度（CMAS中的1/10）之外的CMAS的所有性质的虚拟液。发现较低粘度液体与头部和偏心案例的CMA相比显着变形。使用动力学，表面和耗散能量的预算量化这些差异。本文代表了对CMAS液滴二进制碰撞的第一研究。

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  • 来源
    《Journal of Materials Research》 |2020年第17期|2260-2274|共15页
  • 作者

    Himakar Ganti l; Prashant Khare; Luis Bravo;

  • 作者单位

    Department of Aerospace Engineering University of Cincinnati Cincinnati Ohio 45221-0070 USA;

    Department of Aerospace Engineering University of Cincinnati Cincinnati Ohio 45221-0070 USA;

    Vehicle Technology Directorate Army Research Laboratory Aberdeen Proving Ground Maryland 21005 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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