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This work combines real gas thermodynamics with the flamelet-generated manifold (FGM) combustion model to simulate transcritical oxygen injection and supercritical LOx-methane combustion dynamics. The benchmark Mascotte chamber, G2 RCM-3 (V04) test case, validates the FGM model within the large eddy simulation (LES) framework, accurately reproducing the experimental flame structure and OH concentration. The framework is then applied to a 7-injector combustion chamber with bi-directional swirl LOx-methane injectors, examining combustion characteristics and dynamics at supercritical pressures. The results capture the onset of transverse waves and reveal the interplay between injectors and chamber acoustics. We attempt to decipher the complex interdependence of enhanced chamber acoustics due to positive frequency coupling with the injectors. Resonance modes are identified and qualitatively studied to understand the injectors’ role in enhanced chamber dynamics. The findings reveal intricate combustion dynamics mechanisms, providing better insights into the stability of multi-element rocket-scale combustors.

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Supercritical Combustion Modeling and Dynamics in LOx-Methane Rocket Engine

  • 章节

  • 发表日期：

    2025年

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  • Abhishek Sharma,
  • Ashoke De,
  • S. Sunil Kumar

摘要

This work combines real gas thermodynamics with the flamelet-generated manifold (FGM) combustion model to simulate transcritical oxygen injection and supercritical LOx-methane combustion dynamics. The benchmark Mascotte chamber, G2 RCM-3 (V04) test case, validates the FGM model within the large eddy simulation (LES) framework, accurately reproducing the experimental flame structure and OH concentration. The framework is then applied to a 7-injector combustion chamber with bi-directional swirl LOx-methane injectors, examining combustion characteristics and dynamics at supercritical pressures. The results capture the onset of transverse waves and reveal the interplay between injectors and chamber acoustics. We attempt to decipher the complex interdependence of enhanced chamber acoustics due to positive frequency coupling with the injectors. Resonance modes are identified and qualitatively studied to understand the injectors’ role in enhanced chamber dynamics. The findings reveal intricate combustion dynamics mechanisms, providing better insights into the stability of multi-element rocket-scale combustors.