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Title: Adaptive mesh based combustion simulations of direct fuel injection effects in a supersonic cavity flame-holder

Abstract

Here, 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.

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [2]
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  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1799879
Report Number(s):
NREL/JA-2C00-75491
Journal ID: ISSN 0010-2180; MainId:6477;UUID:7d46ceb8-090b-ea11-9c2a-ac162d87dfe5;MainAdminID:24563
Grant/Contract Number:  
AC36-08GO28308; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 232; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; cavity flame-holder; fuel injection; high fidelity numerical simulation; supersonic flow

Citation Formats

Sitaraman, Hariswaran, Yellapantula, Shashank, Henry de Frahan, Marc, Perry, Bruce, Rood, Jon, Grout, Ray, and Day, Marc. Adaptive mesh based combustion simulations of direct fuel injection effects in a supersonic cavity flame-holder. United States: N. p., 2021. Web. doi:10.1016/j.combustflame.2021.111531.
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Sitaraman, Hariswaran, Yellapantula, Shashank, Henry de Frahan, Marc, Perry, Bruce, Rood, Jon, Grout, Ray, & Day, Marc. Adaptive mesh based combustion simulations of direct fuel injection effects in a supersonic cavity flame-holder. United States. https://doi.org/10.1016/j.combustflame.2021.111531
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Sitaraman, Hariswaran, Yellapantula, Shashank, Henry de Frahan, Marc, Perry, Bruce, Rood, Jon, Grout, Ray, and Day, Marc. Sat . "Adaptive mesh based combustion simulations of direct fuel injection effects in a supersonic cavity flame-holder". United States. https://doi.org/10.1016/j.combustflame.2021.111531. https://www.osti.gov/servlets/purl/1799879.
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@article{osti_1799879,
title = {Adaptive mesh based combustion simulations of direct fuel injection effects in a supersonic cavity flame-holder},
author = {Sitaraman, Hariswaran and Yellapantula, Shashank and Henry de Frahan, Marc and Perry, Bruce and Rood, Jon and Grout, Ray and Day, Marc},
abstractNote = {Here, 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.},
doi = {10.1016/j.combustflame.2021.111531},
journal = {Combustion and Flame},
number = ,
volume = 232,
place = {United States},
year = {Sat Jun 19 00:00:00 EDT 2021},
month = {Sat Jun 19 00:00:00 EDT 2021}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.combustflame.2021.111531
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