Effects of Premixing on Emissions and Flame Stabilization for a High-Pressure Reacting Jet In Crossflow
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| Title: | Effects of Premixing on Emissions and Flame Stabilization for a High-Pressure Reacting Jet In Crossflow |
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| Authors: | Torres Serrano, Penelope |
| Committee Members: | Ahmed, Kareem |
| Summary: | The effects of fuel premixing on the emissions and flame stabilization characteristics of a high-pressure, axially staged combustion system are experimentally examined. The experimental facility is split into two major components. The main stage provides a high-pressure, high-temperature crossflow that is consistent for all test conditions, and the axial stage provides the reacting jet-in-crossflow, where the flame temperature is varied by equivalence ratio sweep. Methane is injected through the axial stage into a high-speed vitiated crossflow under varying conditions, ranging premixing states, for various equivalence ratios. Experimentally, it is observed that NOx emissions increase with equivalence ratio and decrease under premixed conditions. The effects of equivalence ratio are well normalized by analyzing and quantifying the contribution from the individual NOx formation mechanisms. The effects of premixing are captured through the development of beta probability density functions to characterize the mixture fraction distribution of the non-premixed flames. This provides the capability to compare the contributions of these factors across different operating conditions, and hence contributing to the prediction of NOx emissions. The analysis effectively collapses the experimental data and appropriately captures the effects of premixing, which has previously not been characterized on lean premixed axial stage flame emissions. |
| URL: | https://stars.library.ucf.edu/etd2024/76 |
| Database: | OpenDissertations |
| Abstract: | The effects of fuel premixing on the emissions and flame stabilization characteristics of a high-pressure, axially staged combustion system are experimentally examined. The experimental facility is split into two major components. The main stage provides a high-pressure, high-temperature crossflow that is consistent for all test conditions, and the axial stage provides the reacting jet-in-crossflow, where the flame temperature is varied by equivalence ratio sweep. Methane is injected through the axial stage into a high-speed vitiated crossflow under varying conditions, ranging premixing states, for various equivalence ratios. Experimentally, it is observed that NOx emissions increase with equivalence ratio and decrease under premixed conditions. The effects of equivalence ratio are well normalized by analyzing and quantifying the contribution from the individual NOx formation mechanisms. The effects of premixing are captured through the development of beta probability density functions to characterize the mixture fraction distribution of the non-premixed flames. This provides the capability to compare the contributions of these factors across different operating conditions, and hence contributing to the prediction of NOx emissions. The analysis effectively collapses the experimental data and appropriately captures the effects of premixing, which has previously not been characterized on lean premixed axial stage flame emissions. |
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