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<p>The rotating detonation engine (RDE) is an emerging propulsion concept with significant potential for advanced power generation and aerospace applications. This study presents three-dimensional (3D) numerical simulations of hydrogen–air RDE flow fields to elucidate the underlying mechanisms, explore control strategies, and identify characteristic parameters associated with rotating detonation waves (RDWs) across different operational modes-defined by the number of detonation waves propagating within the combustor. Various operational behaviors are investigated through a multi-ignition approach and by modulating two key parameters: the injection stagnation pressure <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({p_{{\rm{t}},{\rm{in}}}}\)</EquationSource> </InlineEquation> and the injection area ratio <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({A_{{\rm{th}}}}/{A_{{\rm{ch}}}}\)</EquationSource> </InlineEquation>. Our findings show that different control operations result in self-regulating processes with varying fluctuation amplitudes. Specifically, increasing <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({p_{{\rm{t}},{\rm{in}}}}\)</EquationSource> </InlineEquation> causes significant fluctuations, while increasing <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({A_{{\rm{th}}}}/{A_{{\rm{ch}}}}\)</EquationSource> </InlineEquation> leads to smoother self-regulation. Moreover, <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\({A_{{\rm{th}}}}/{A_{{\rm{ch}}}}\)</EquationSource> </InlineEquation> is identified as a key factor for the RDE to achieve a positive pressure gain. The concept of non-confinement rate <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\delta \)</EquationSource> </InlineEquation> is introduced to adjust the critical height value <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\({h^{\bf{\it{*}}}}\)</EquationSource> </InlineEquation> of RDWs, aligning with experimental results. A new equivalent available pressure (EAP) evaluation method based on the total enthalpy, i.e. EAPh, is also preliminarily introduced.</p>

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Numerical Study on Operation Modes, Operational Characteristics, and Propulsion Performance of Rotating Detonation Engines

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Xinmeng Tang,
  • Songbai Yao,
  • Chenyao Li,
  • Wenwu Zhang,
  • Jianping Wang

摘要

The rotating detonation engine (RDE) is an emerging propulsion concept with significant potential for advanced power generation and aerospace applications. This study presents three-dimensional (3D) numerical simulations of hydrogen–air RDE flow fields to elucidate the underlying mechanisms, explore control strategies, and identify characteristic parameters associated with rotating detonation waves (RDWs) across different operational modes-defined by the number of detonation waves propagating within the combustor. Various operational behaviors are investigated through a multi-ignition approach and by modulating two key parameters: the injection stagnation pressure \({p_{{\rm{t}},{\rm{in}}}}\) and the injection area ratio \({A_{{\rm{th}}}}/{A_{{\rm{ch}}}}\) . Our findings show that different control operations result in self-regulating processes with varying fluctuation amplitudes. Specifically, increasing \({p_{{\rm{t}},{\rm{in}}}}\) causes significant fluctuations, while increasing \({A_{{\rm{th}}}}/{A_{{\rm{ch}}}}\) leads to smoother self-regulation. Moreover, \({A_{{\rm{th}}}}/{A_{{\rm{ch}}}}\) is identified as a key factor for the RDE to achieve a positive pressure gain. The concept of non-confinement rate \(\delta \) is introduced to adjust the critical height value \({h^{\bf{\it{*}}}}\) of RDWs, aligning with experimental results. A new equivalent available pressure (EAP) evaluation method based on the total enthalpy, i.e. EAPh, is also preliminarily introduced.