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<p>This study investigates the influence of back pressure on the mass ejection coefficient (u) of low-pressure methane-air ejectors through a combined approach of one-dimensional mathematical modeling and computational fluid dynamics (CFD) simulations. By establishing a quadratic relationship between u and back pressure (h<sub>c</sub>), we reveal three distinct operational regimes: a slow growth phase, a rapid escalation phase, and a critical degradation phase. CFD results validate the theoretical model with a coefficient of determination (R<sup>2</sup>) of 0.9941 in the quadratic region. A key finding is the identification of a linear correlation between the critical back pressure (h<sub>c,crit</sub>) and nozzle pressure (h<sub>n</sub>), expressed as h<sub>c,crit</sub> = − 0.0629&#xa0;h<sub>n</sub> + 0.8966&#xa0;Pa. This work provides actionable guidelines for optimizing ejector geometry and operating conditions in residential gas appliances.</p>

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Research on the ejection performance of an ejector with low pressure and back pressure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月8日

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  • Cong Chen,
  • Haijing Liu,
  • Pengfei Duan

摘要

This study investigates the influence of back pressure on the mass ejection coefficient (u) of low-pressure methane-air ejectors through a combined approach of one-dimensional mathematical modeling and computational fluid dynamics (CFD) simulations. By establishing a quadratic relationship between u and back pressure (hc), we reveal three distinct operational regimes: a slow growth phase, a rapid escalation phase, and a critical degradation phase. CFD results validate the theoretical model with a coefficient of determination (R2) of 0.9941 in the quadratic region. A key finding is the identification of a linear correlation between the critical back pressure (hc,crit) and nozzle pressure (hn), expressed as hc,crit = − 0.0629 hn + 0.8966 Pa. This work provides actionable guidelines for optimizing ejector geometry and operating conditions in residential gas appliances.