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A high-pressure LOx-Methane ( \(\text {LO}x\) - \(\text {CH}_4\) ) rocket engine is characterized by transcritical injection and supercritical combustion phenomena which pose various difficulties during numerical modeling. Near the critical point region, thermophysical properties undergo highly non-linear behavior, which can impact the flow and flame evolution. In this study, a comprehensive thermodynamic modeling of \(\text {LO}x\) - \(\text {CH}_4\) engine is conducted to capture such a non-linear phenomenon. A real gas-based thermodynamic and high-pressure transport framework is invoked to represent transcritical injection and supercritical combustion. Multiple real gas models are tested to evaluate thermophysical properties over the entire range of operations. Our study captured non-linear behavior near critical point operation of \(\text {LO}x\) - \(\text {CH}_4\) engine. We identified a high-pressure thermodynamic and transport modeling framework that can be utilized for computational fluid dynamics (CFD) simulations.

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Thermodynamic and Transport Property Modeling of High-Pressure LOx-Methane Rocket Engine

  • 会议论文

  • 发表日期：

    2026年

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  • Rahul Kumar,
  • Abhishek Sharma,
  • Aravind Vaidyanathan,
  • T. John Tharakan

摘要

A high-pressure LOx-Methane ( \(\text {LO}x\) - \(\text {CH}_4\) ) rocket engine is characterized by transcritical injection and supercritical combustion phenomena which pose various difficulties during numerical modeling. Near the critical point region, thermophysical properties undergo highly non-linear behavior, which can impact the flow and flame evolution. In this study, a comprehensive thermodynamic modeling of \(\text {LO}x\) - \(\text {CH}_4\) engine is conducted to capture such a non-linear phenomenon. A real gas-based thermodynamic and high-pressure transport framework is invoked to represent transcritical injection and supercritical combustion. Multiple real gas models are tested to evaluate thermophysical properties over the entire range of operations. Our study captured non-linear behavior near critical point operation of \(\text {LO}x\) - \(\text {CH}_4\) engine. We identified a high-pressure thermodynamic and transport modeling framework that can be utilized for computational fluid dynamics (CFD) simulations.