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To investigate the influence of the Skip Distance Ratio (SDR) on the flow field and thrust performance of a thrust chamber, a three-dimensional liquid-liquid rocket combustor with a continuous slit pintle injector was studied. An Eulerian-Lagrangian framework was adopted, treating the combustion gas as the continuous phase and both MMH and NTO droplets as the discrete phase. A Discrete Particle Method (DPM) with finite-rate chemistry was employed to model droplet injection, evaporation, and combustion. Numerical simulations revealed three distinct recirculation zones within the thrust chamber: the mantle, core, and outlet recirculation zones. Analysis of vortex distribution and thrust performance at different SDR values showed that changes in propellant injection position affect the recirculation zone distribution, thereby influencing propellant mixing. The thrust chamber demonstrated optimal performance when SDR = 0.8.

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Pintle Injector Performance and Flow Field Sensitivity to the Skip Distance Ratio

  • 会议论文

  • 发表日期：

    2026年

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  • Hao Zhang,
  • Fan Zhao,
  • Hai-bin Zhang,
  • Bo-feng Bai

摘要

To investigate the influence of the Skip Distance Ratio (SDR) on the flow field and thrust performance of a thrust chamber, a three-dimensional liquid-liquid rocket combustor with a continuous slit pintle injector was studied. An Eulerian-Lagrangian framework was adopted, treating the combustion gas as the continuous phase and both MMH and NTO droplets as the discrete phase. A Discrete Particle Method (DPM) with finite-rate chemistry was employed to model droplet injection, evaporation, and combustion. Numerical simulations revealed three distinct recirculation zones within the thrust chamber: the mantle, core, and outlet recirculation zones. Analysis of vortex distribution and thrust performance at different SDR values showed that changes in propellant injection position affect the recirculation zone distribution, thereby influencing propellant mixing. The thrust chamber demonstrated optimal performance when SDR = 0.8.