Influence of bluff bodies on lean premixed combustion and pollutant emissions: A numerical approach | ||
| Journal of International Society for Science and Engineering | ||
| Volume 7, Issue 2, June 2025, Pages 29-38 PDF (764.26 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jisse.2025.404933.1114 | ||
| Authors | ||
| Mostafa R. Rashed* 1; Ahmed A. Altohamy2; Mahmoud Shaaban3; Ismail M.M. Elsemary2 | ||
| 1Mechanical Engineering Department, Faculty of Engineering, Modern University for Technology and Information, Cairo, Egypt | ||
| 2Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt | ||
| 3Mechanical Engineering Program, School of Engineering and Applied Sciences, Nile University, Giza, Egypt | ||
| Abstract | ||
| The flame holder configuration can significantly affect the performance of a combustion system. In this study, the influence of fuel composition and bluff body geometry on the lean premixed combustion system performance indicators, including temperature, stability, NOx production, and unburned hydrocarbons, are numerically investigated. The premixed combustion of five pure hydrocarbon fuels, namely H2, CH4, C2H2, C2H4, and C2H6, is simulated using a three dimensional coupled stoichiometric-CFD model. The holder bluff body cross-section shape is varied to assess the impact of the flow patterns on the combustion parameters. The numerical model provided satisfactory agreement with experimental data for propane-air combustion. Results indicate that lighter fuels sustain higher combustion completion and higher flame stability. The bluff body shape significantly impacted temperature distribution and flame shape compared to the plate flame holder design, which produced a broad flame along the burner. The findings establish a relationship between bluff body geometry, enhanced flame stability, and the conditions that influence pollutant formation, providing a basis for designs that mitigate NOx emissions during stable operation at leaner equivalence ratios. | ||
| Keywords | ||
| CFD; Flame holder; Bluff body; Premixed mixture; Combustion | ||
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