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<p>The asymmetric vibration hydrogen combustor (AVHC) is a novel device that integrates mechanical vibration with combustion to directly convert the thermal energy of hydrogen combustion into electricity, featuring a flexible, asymmetrical compression-expansion process for performance optimization. However, its unstable dynamics pose a challenge in optimizing the ignition position (IP) to manage the complex interplay of mechanical, electrical, fluid, and thermal fields. This study develops a fully cyclic, integrated simulation model coupling asymmetric vibration, gas exchange, and combustion to investigate the effect of IP on the dynamics and combustion characteristics of an AVHC, benchmarked against a conventional combustor. The numerical approach utilizes the k-zeta-f turbulence model and the ECFM-3Z combustion model on a grid of 95,724 cells. Simulations are conducted across IPs from 0 to 6&#xa0;mm at 1-mm intervals. The results reveal that the AVHC’s asymmetric vibration, characterized by slow compression and rapid expansion, prolongs gas exchange duration, enhancing mixture preparation. Advancing the IP from 0&#xa0;mm to the optimal value of 3&#xa0;mm significantly enhances system performance, increasing the equivalent rotational speed from 1746 to 2024&#xa0;RPM and achieving peak combustion efficiency of 96.8%, indicated work of 124.9&#xa0;J, and thermal efficiency of 42.6%. This improvement is attributed to favorable combustion phasing and minimized pre-ignition tendencies at the optimal IP. However, further increasing the IP beyond 3&#xa0;mm leads to irregular temperature propagation, increased pre-ignition propensity, and reduced isovolumic heat release, thereby compromising efficiency.</p>

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Influence of ignition position on combustion dynamics in a hydrogen thermoelectric combustor with asymmetric vibration

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Shisen Qin,
  • Qinglong Wu,
  • Chunzhi Liu,
  • Yituan He,
  • Chenheng Yuan

摘要

The asymmetric vibration hydrogen combustor (AVHC) is a novel device that integrates mechanical vibration with combustion to directly convert the thermal energy of hydrogen combustion into electricity, featuring a flexible, asymmetrical compression-expansion process for performance optimization. However, its unstable dynamics pose a challenge in optimizing the ignition position (IP) to manage the complex interplay of mechanical, electrical, fluid, and thermal fields. This study develops a fully cyclic, integrated simulation model coupling asymmetric vibration, gas exchange, and combustion to investigate the effect of IP on the dynamics and combustion characteristics of an AVHC, benchmarked against a conventional combustor. The numerical approach utilizes the k-zeta-f turbulence model and the ECFM-3Z combustion model on a grid of 95,724 cells. Simulations are conducted across IPs from 0 to 6 mm at 1-mm intervals. The results reveal that the AVHC’s asymmetric vibration, characterized by slow compression and rapid expansion, prolongs gas exchange duration, enhancing mixture preparation. Advancing the IP from 0 mm to the optimal value of 3 mm significantly enhances system performance, increasing the equivalent rotational speed from 1746 to 2024 RPM and achieving peak combustion efficiency of 96.8%, indicated work of 124.9 J, and thermal efficiency of 42.6%. This improvement is attributed to favorable combustion phasing and minimized pre-ignition tendencies at the optimal IP. However, further increasing the IP beyond 3 mm leads to irregular temperature propagation, increased pre-ignition propensity, and reduced isovolumic heat release, thereby compromising efficiency.