Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burner
Abstract In this study, a series of experiments are done to analyze the effect of bluff body geometry on the NOx reduction of a natural gas-air stratified swirl burner. The stratified burner of Cambridge University is chosen to study the mentioned geometrical effect, and the geometry modification of...
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2025-01-01
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| Online Access: | https://doi.org/10.1038/s41598-025-86198-2 |
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| author | Morteza Nahvi Kiumars Mazaheri Mohammad Zabetian Targhi Fatemeh Eskandari |
| author_facet | Morteza Nahvi Kiumars Mazaheri Mohammad Zabetian Targhi Fatemeh Eskandari |
| author_sort | Morteza Nahvi |
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| description | Abstract In this study, a series of experiments are done to analyze the effect of bluff body geometry on the NOx reduction of a natural gas-air stratified swirl burner. The stratified burner of Cambridge University is chosen to study the mentioned geometrical effect, and the geometry modification of bluff body is used as a simple method for NOx reduction, which can be easily applied to the systems using these burners, including gas turbines. The bluff body geometrical change to an annular bluff body is inspired by the fact that the areas in which the edge of the bluff body is in contact with the unburned flow have lower temperatures, which can drastically affect combustion parameters, especially emissions. This new geometry is called the Annular Bluff body Stratified Burner, ABSB. The comparison of the mentioned burners is made for three equivalence ratios, Ф, stratification cases: premixed, moderately stratified, and highly stratified with a global equivalence ratio of 0.75, in the conditions of atmospheric pressure and the temperature of the inlet mixture of 26 degrees of Celsius. Flame spectroscopy compares the chemiluminescence intensities of OH*, CH*, C2*, H2O*, and CO2*. Digital image processing, flame edge detection, and exhaust gas analysis are also utilized to measure flames’ general dimensions and emissions. According to experiments, for ABSB cases, a general decrease of about 14% in Nitrogen Oxides, especially NO and NO2, and an increase of about 17% in Carbon Monoxide are observed. Besides, the average bluff body temperature dropped by about 20% in ABSB for all three stratification cases. |
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| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-be0592991f8243ec9132432f130044a92025-01-19T12:24:35ZengNature PortfolioScientific Reports2045-23222025-01-0115111610.1038/s41598-025-86198-2Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burnerMorteza Nahvi0Kiumars Mazaheri1Mohammad Zabetian Targhi2Fatemeh Eskandari3Department of Mechanical Engineering, Tarbiat Modares UniversityDepartment of Mechanical Engineering, Tarbiat Modares UniversityDepartment of Mechanical Engineering, Tarbiat Modares UniversityDepartment of Mechanical Engineering, Tarbiat Modares UniversityAbstract In this study, a series of experiments are done to analyze the effect of bluff body geometry on the NOx reduction of a natural gas-air stratified swirl burner. The stratified burner of Cambridge University is chosen to study the mentioned geometrical effect, and the geometry modification of bluff body is used as a simple method for NOx reduction, which can be easily applied to the systems using these burners, including gas turbines. The bluff body geometrical change to an annular bluff body is inspired by the fact that the areas in which the edge of the bluff body is in contact with the unburned flow have lower temperatures, which can drastically affect combustion parameters, especially emissions. This new geometry is called the Annular Bluff body Stratified Burner, ABSB. The comparison of the mentioned burners is made for three equivalence ratios, Ф, stratification cases: premixed, moderately stratified, and highly stratified with a global equivalence ratio of 0.75, in the conditions of atmospheric pressure and the temperature of the inlet mixture of 26 degrees of Celsius. Flame spectroscopy compares the chemiluminescence intensities of OH*, CH*, C2*, H2O*, and CO2*. Digital image processing, flame edge detection, and exhaust gas analysis are also utilized to measure flames’ general dimensions and emissions. According to experiments, for ABSB cases, a general decrease of about 14% in Nitrogen Oxides, especially NO and NO2, and an increase of about 17% in Carbon Monoxide are observed. Besides, the average bluff body temperature dropped by about 20% in ABSB for all three stratification cases.https://doi.org/10.1038/s41598-025-86198-2Gas turbine burnerUltra-low NOx BurnerStratified CombustionBluff Body temperatureChemiluminescence spectroscopyCambridge/Sandia burner |
| spellingShingle | Morteza Nahvi Kiumars Mazaheri Mohammad Zabetian Targhi Fatemeh Eskandari Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burner Scientific Reports Gas turbine burner Ultra-low NOx Burner Stratified Combustion Bluff Body temperature Chemiluminescence spectroscopy Cambridge/Sandia burner |
| title | Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burner |
| title_full | Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burner |
| title_fullStr | Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burner |
| title_full_unstemmed | Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burner |
| title_short | Experimental investigation of bluff body geometry effects on nitrogen oxides emissions from Cambridge stratified burner |
| title_sort | experimental investigation of bluff body geometry effects on nitrogen oxides emissions from cambridge stratified burner |
| topic | Gas turbine burner Ultra-low NOx Burner Stratified Combustion Bluff Body temperature Chemiluminescence spectroscopy Cambridge/Sandia burner |
| url | https://doi.org/10.1038/s41598-025-86198-2 |
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