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<p>When aircraft engines operate near the ground, the ground effects would generate ground vortex. This study employs the large-Eddy simulation (LES) method to investigate the characteristics and evolution of ground vortices under varying outlet mass flow rates and incoming flow directions. The results reveal significant unsteadiness in ground vortices, with both vortex strength and pressure distortion coefficient exhibiting notable fluctuations over time. As the mass flow rate increases, the vortex structure transitions between single-vortex and double-vortex configurations. Changes in the incoming flow direction lead to noticeable shifts in vortex core size and position, with the vortex transitioning from trailing to shedding, resulting in substantial pressure distortion. The findings provide theoretical support for the design of shipborne engine test platforms and deepen the understanding of the formation conditions of ground vortices.</p>

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LES Study on the Ground Vortex Aerodynamics Characteristic Under Time-Varying Inlet Flow Rate and Incoming Flow Direction

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Longqing Lei,
  • Pengfei Chen,
  • Hua Yang,
  • Shuxin Cui,
  • Wei Chen

摘要

When aircraft engines operate near the ground, the ground effects would generate ground vortex. This study employs the large-Eddy simulation (LES) method to investigate the characteristics and evolution of ground vortices under varying outlet mass flow rates and incoming flow directions. The results reveal significant unsteadiness in ground vortices, with both vortex strength and pressure distortion coefficient exhibiting notable fluctuations over time. As the mass flow rate increases, the vortex structure transitions between single-vortex and double-vortex configurations. Changes in the incoming flow direction lead to noticeable shifts in vortex core size and position, with the vortex transitioning from trailing to shedding, resulting in substantial pressure distortion. The findings provide theoretical support for the design of shipborne engine test platforms and deepen the understanding of the formation conditions of ground vortices.