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<p>A two-dimensional Building Cube Method (BCM) solver was developed and validated to enable high-precision analysis of supersonic internal flows in scramjet combustors featuring cavity flameholders. By incorporating an immersed boundary method and a third-order monotonic upstream-centered scheme for conservation laws (MUSCL) scheme, the solver successfully reproduced benchmark results for backward-facing step and cavity configurations, showing excellent agreement with experimental and numerical data in terms of pressure distribution, vortex structure, residence time, and drag characteristics. To clarify the effect of divergent section placement, four representative cavity configurations were analyzed numerically. When the cavity was positioned at or upstream of the divergent section, the residence time increased by up to threefold and the pressure-drag coefficient decreased by up to 54%, attributed to shear layer development suppressing the mass exchange with the main flow. These results provide new insights into cavity-induced flow dynamics and offer practical design guidelines for improving the combustion stability and reducing aerodynamic losses in scramjet engines.</p>

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Numerical investigation of flow dynamics and aerodynamic characteristics of cavity flameholders in divergent sections of scramjet combustors using building-cube method

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Shinichiro Ogawa,
  • Kentaro Miyata,
  • Daisuke Sasaki

摘要

A two-dimensional Building Cube Method (BCM) solver was developed and validated to enable high-precision analysis of supersonic internal flows in scramjet combustors featuring cavity flameholders. By incorporating an immersed boundary method and a third-order monotonic upstream-centered scheme for conservation laws (MUSCL) scheme, the solver successfully reproduced benchmark results for backward-facing step and cavity configurations, showing excellent agreement with experimental and numerical data in terms of pressure distribution, vortex structure, residence time, and drag characteristics. To clarify the effect of divergent section placement, four representative cavity configurations were analyzed numerically. When the cavity was positioned at or upstream of the divergent section, the residence time increased by up to threefold and the pressure-drag coefficient decreased by up to 54%, attributed to shear layer development suppressing the mass exchange with the main flow. These results provide new insights into cavity-induced flow dynamics and offer practical design guidelines for improving the combustion stability and reducing aerodynamic losses in scramjet engines.