Emission characteristics of a model combustor for aero gas turbine application

Li, Lin; Lin, Yuzhen; Fu, Zhenbo; Zhang, Chi

doi:10.1016/j.expthermflusci.2015.11.012

Cited by 40 publications

(7 citation statements)

References 33 publications

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“…[20] conducted delicate measurements of flame structures in a stratified swirl burner, but did not study thermoacoustic properties. However, the above three configurations do not feature a separation lip between the inner and outer streams, which is essential to reduce NOx emissions [21]. Li et al.…”

Section: Introductionmentioning

confidence: 99%

Flame macrostructures and thermoacoustic instabilities in stratified swirling flames

Han

Laera

Morgans

et al. 2019

Proceedings of the Combustion Institute

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Section: Introductionmentioning

confidence: 99%

Flame macrostructures and thermoacoustic instabilities in stratified swirling flames

Han

Laera

Morgans

et al. 2019

Proceedings of the Combustion Institute

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“…These two flames are usually separated by a lip structure, as sketched in Fig. 1(a), to delicately adjust the mixing and merging of the two streams -this has a direct impact on the entire flow field and equivalence ratio distribution and has been shown to play a key role in NOx reduction [6].…”

Section: Introductionmentioning

confidence: 99%

“…Using industrial LPP combustors, self-excited limit cycle oscillation operated at elevated-pressure conditions was measured and analyzed by Temme et al [12]. Li et al [6] found that the equivalence ratios affect the combustion efficiency and emissions significantly in a high-pressure configuration. But the both combustors in Refs [6,12] feature complicated geometries and were not shown in detail.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al [6] found that the equivalence ratios affect the combustion efficiency and emissions significantly in a high-pressure configuration. But the both combustors in Refs [6,12] feature complicated geometries and were not shown in detail. Recently, a simplified stratified burner was developed by the authors' group [13] to elucidate the role of the pilot flame in anchoring the main flame experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Flame interactions in a stratified swirl burner: Flame stabilization, combustion instabilities and beating oscillations

Han

Laera

Yang

et al. 2020

Combustion and Flame

Self Cite

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The present article investigates the interactions between the pilot and main flames in a novel stratified swirl burner using both experimental and numerical methods. Experiments are conducted in a test rig operating at atmospheric conditions. The system is equipped with the BASIS (Beihang Axial Swirler Independently-Stratified) burner fuelled with premixed methane-air mixtures. To illustrate the interactions between the pilot and main flames, three operating modes are studied, where the burner works with (i) only the pilot flame, (ii) only the main flame, and (iii) the stratified flame (with both the pilot and main flames). We found that: (1) In the pilot flame mode, the flame changes from V-shape to M-shape when the main stage is switched from closed to supplying a pure air stream. Strong oscillations in the M-shape flame are found due to the dilution of the main air to the pilot methane flame. (2) In the main flame mode, the main flame is lifted off from the burner if the pilot stage is supplied with air. The temperature of the primary recirculation zone drops substantially and the unsteady heat release is intensified. (3) In the stratified flame mode, unique beating oscillations exhibiting dual closely-spaced frequencies in the pressure spectrum

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“…The influence of combustion temperature on NO x is considered by the inclusion of the fuel to air ratio f far . Recently, several correlations were obtained for specific industrial combustors: a correlation for a model combustor of an aero gas turbine by Li et al [28], a correlation for fuel staged combustion employing laboratory-scale gas turbine combustor by Han et al [7], and another correlation for a 10 MW non-premixed gas turbine combustor utilizing high hydrogen fuels by Kroniger and Wirsum [29].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-divergent Nozzle at Elevated Pressure

et al. 2018

Energies

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The behavior of the pollutants NO and CO at elevated combustor pressure are of special importance due to the continuing trend toward developing engines operating at higher pressure ratios to yield higher thermal efficiency. An experiment was performed to examine the NO and CO emissions for a swirl convergent-divergent nozzle at elevated pressure. The NO and CO correlations were obtained. Meanwhile, the flame length, exhaust gas oxygen concentration, exit temperature and global flame residence time were also determined to analyze the NO and CO emission characteristics. The results showed that, with the increase in combustor pressure P, flame length decreased proportionally to P −0.49 ; exit O 2 volume fraction increased and exit temperature was reduced. The global flame residence time decreased proportionally to P −0.43. As pressure increased, the NO and Emission Index of NO (EINO) levels decreased proportionally to P −0.53 and P −0.6 respectively, which is mainly attributed to the influence of global flame residence time; the NO and EINO increased almost proportionally with the increase in global flame residence time. The EINO scaling EINO (ρu e /d) was proportional to Fr 0.42 , which indicated that compared with pure fuel, the fuel diluted with primary air can cause a decrease in the exponent of the Fr power function. At higher pressure, the CO and Emission Index of CO (EICO) decreased proportionally to P −0.35 and P −0.4 , respectively, due to the increased unburned methane and high pressure which accelerated chemical reaction kinetics to promote the conversion of CO to CO 2 .

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Emission characteristics of a model combustor for aero gas turbine application

Cited by 40 publications

References 33 publications

Flame macrostructures and thermoacoustic instabilities in stratified swirling flames

Flame macrostructures and thermoacoustic instabilities in stratified swirling flames

Flame interactions in a stratified swirl burner: Flame stabilization, combustion instabilities and beating oscillations

An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-divergent Nozzle at Elevated Pressure

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