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<p>The hydrogen combustion flow characteristics in a trapped vortex combustor with multiple direct-injection are numerically investigated at different times. The results show that for the vortex in the rear cavity, the vortex core forms and rapidly evolves into a large-scale vortex, migrating to the rear cavity end and interacts with a newly formed small-scale vortex in the front of the rear cavity, eventually merging into a single vortex. For the vortex in the front cavity, the vortex core undergoes the process of preliminary formation, disappearance, reappearance, and development into a large-scale vortex. The flame emerges at 15&#xa0;ms, and a stable flame is basically established at 45&#xa0;ms. The flame stretching rate is mainly influenced by turbulence, while pressure fluctuation is controlled by the turbulence, flame formation, and heat propagation. At 45&#xa0;ms, the NO generation region first emerges near the downstream wall and combustor outlet, subsequently connecting and expanding toward the wall. By 500&#xa0;ms, they merge into a single region. As heat release and diffusion proceed, the NO generation region spreads to the upstream and downstream cavities of the bluff body, with the spread almost completely finished by 1100&#xa0;ms.</p>

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Combustion flow characteristics in a hydrogen trapped vortex combustor with multiple direct-injection

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Zhuoxiong Zeng,
  • Ruibing Wu

摘要

The hydrogen combustion flow characteristics in a trapped vortex combustor with multiple direct-injection are numerically investigated at different times. The results show that for the vortex in the rear cavity, the vortex core forms and rapidly evolves into a large-scale vortex, migrating to the rear cavity end and interacts with a newly formed small-scale vortex in the front of the rear cavity, eventually merging into a single vortex. For the vortex in the front cavity, the vortex core undergoes the process of preliminary formation, disappearance, reappearance, and development into a large-scale vortex. The flame emerges at 15 ms, and a stable flame is basically established at 45 ms. The flame stretching rate is mainly influenced by turbulence, while pressure fluctuation is controlled by the turbulence, flame formation, and heat propagation. At 45 ms, the NO generation region first emerges near the downstream wall and combustor outlet, subsequently connecting and expanding toward the wall. By 500 ms, they merge into a single region. As heat release and diffusion proceed, the NO generation region spreads to the upstream and downstream cavities of the bluff body, with the spread almost completely finished by 1100 ms.