Adaptive Mesh Based Combustion Simulations of Direct Fuel Injection Effects in a Supersonic Cavity Flame-Holder

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Abstract

We present high-fidelity reacting simulations of a supersonic cavity flame-holder configuration. The focus of this work is on flame stabilization brought about by varying the location of fuel injection in a cavity stabilized supersonic flow of air. Central to our approach is a compressible multi-species reacting flow solver that uses adaptive-mesh-refinement (AMR), enabling the resolution of flame, shock-waves, boundary-layers, and small-scale structures in the computational domain. Our analysis indicates that fuel injection closer to the ramp at the aft end of the cavity allows for greater mixing and lower peak temperatures compared to fuel injection upstream that is closer to the backward facing step of the cavity. This difference is mainly due to greater turbulent fluctuations generated from the shear-layer towards the cavity ramp, thereby enhancing the mixing of fuel and air. A low frequency oscillatory behaviour in heat-release and pressure was also observed for the upstream injection case while a much higher-frequency phenomena was observed in the near-ramp injection case. By identifying the important physical determinants of the combustion processes, this study illustrates a promising pathway to design and optimize direct fuel injection strategies in supersonic cavity flame-holders that can improve flame stability, combustion efficiency, and reduce emissions.

Original languageAmerican English
Article number111531
Number of pages13
JournalCombustion and Flame
Volume232
DOIs
StatePublished - 2021

Bibliographical note

Publisher Copyright:
© 2021

NREL Publication Number

  • NREL/JA-2C00-75491

Keywords

  • Cavity flame-holder
  • High fidelity numerical simulation
  • Supersonic flow

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