Effect of Nozzle Spacing on Nitrogen-Oxide Emissions and Lean Operability

Dolan, Brian; Gomez, Rodrigo Villalva; Zink, Gregory; Pack, Spencer; Gutmark, Ephraim

doi:10.2514/1.j054685

Cited by 8 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The flame-flame interaction in the dual-nozzle combustor may cause these differences between the combustors because the other primary conditions (φ, exit velocity, and distance between the nozzle and wall) were maintained constant at the two combustors. Similar effects of the flame-flame interaction on the emission characteristics have been demonstrated in the previous studies [17,18]. However, detailed reasons for the large amount of emissions in the dual-nozzle combustor compared with those in the single-nozzle combustor were not addressed in those studies.…”

Section: Temperature and Emission Characteristicsmentioning

confidence: 60%

“…They reported that the distance between the nozzles can significantly affect NO x emissions, as discussed based on the change in temperature distribution inside the combustor with respect to the distance between nozzles [17]. Dolan et al experimentally observed that the change in NO x emissions with respect to the distance between the nozzles contributed primarily to the change in flame distribution, which induced a change in NO x emission [18]. Kwong et al experimentally measured the change in the LBO limit at various distances between nozzles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of flame-flame interaction on emission characteristics in gas turbine combustors

et al. 2022

View full text Add to dashboard Cite

In real gas turbines, multiple nozzles are used instead of a single-nozzle; therefore, interactions between flames are inevitable. In this study, the effects of flame-flame interaction on the emission characteristics and lean blowout limit were analysed in a CH4-fueled single- and dual-nozzle combustor. OH* chemiluminescence imaging showed that a flame-interacting region, where the two flames from the nozzles were merged, was present in the dual-nozzle combustor, unlike the single-nozzle combustor. Flow-field measurements using particle image velocimetry confirmed that a faster velocity region was formed at the flame merging region, thereby hindering flame stabilisation. In addition, we compared the emission indices of NOx and CO between the two combustors. The emission indices of CO were not significantly different; however, a distinct effect of flame-flame interaction was indicated in NOx. To understand the effect of flame-flame interaction on NOx emissions, we measured temperature distribution using a multi-point thermocouple. Results showed that a wider high-temperature region was formed in the dual-nozzle combustor compared to the single-nozzle combustor; this was attributable to the high OH* chemiluminescence intensity in the flame-interacting region. Furthermore, it was confirmed that the size of this interacting region caused the deformation of the temperature distribution in the combustor, which can induce a difference in the increase ratio of NOx emission between high and low equivalence ratio ranges. In conclusion, we confirmed that flame-flame interaction significantly affected temperature distribution in the downstream of the flame, and the change in temperature distribution contributed primarily to the varying concentration of the emission gas.

show abstract

Section: Temperature and Emission Characteristicsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%