Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals
The structure and characteristics of a turbulent inverse and normal oxy-fuel diffusion flame were studied using a combined experimental and numerical approach to compare and analyze a turbulent non-premixed inverse oxy-fuel and a corresponding normal flame which are both non-piloted. The composition...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2016
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| Summary: | The structure and characteristics of a turbulent inverse and normal oxy-fuel diffusion flame were studied using a combined experimental and numerical approach to compare and analyze a turbulent non-premixed inverse oxy-fuel and a corresponding normal flame which are both non-piloted. The composition of the fuel used was 17.5% CH440% CO242.5% H2and oxidizer was 68% O2and 32% CO2(vol%). Experimentally-obtained Rayleigh ratio and normalized OH-LIF data were directly compared to equivalent numerically-predicted signals by incorporating these observed quantities into the LES/FPV model. Very good agreement was observed in a comparison of the independent and joint statistics of the inverse and normal diffusion flame. Based on the underlying flamelet structure the measurement signals as well as the species profiles agreed well when conditioned on mixture fraction suggesting the same general flame structure wherein the turbulent/non-turbulent interface for both configurations was far from stoichiometry. This means that the major part of the flamelet structure was in the fully turbulent regime. |
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