Experimental investigations of equivalence ratio effect on nonlinear dynamics features in premixed swirl-stabilized combustor

Rao, Zhuming; Li, Ruichao; Zhang, Bo; Wang, Bing; Zhao, Dan; Akhtar, Muhammad Saqib

doi:10.1016/j.ast.2021.106601

Cited by 37 publications

(3 citation statements)

References 46 publications

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“…The investigation into the equivalence ratio effect on nonlinear dynamics features in a premixed swirl-stabilized combustor, when contrasted with Rao et al's (2021) work, reveals complementary aspects. 19 By delving into similar dynamics, this study introduces novel methodologies or analytical tools, thereby expanding the understanding of this intricate phenomenon. This comparative examination emphasizes the originality and distinctiveness of this contribution to the field.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of the fire behavior of composites impacted by kerosene/air turbulent flame

Ogabi,

Manescau,

Chetehouna

2024

Journal of Composite Materials

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In this research, we conducted an experimental analysis of a Kerosene/air burner designed according to the FAA's proposed ISO 2685 standard. The burner serves as a vital tool for generating flames and burnt gases, simulating real-world conditions relevant to fire safety studies. The core objective of this study was to comprehensively characterize the burner's behavior. Through a series of experiments, we investigated the influence of the equivalence ratio on several key parameters, including the spatial distribution of gas temperature (monitored using thermocouples), heat flux (measured with heat flux gauges), and the composition of gas emission species. Notably, our findings revealed a significant correlation between the equivalence ratio and these parameters. Specifically, we observed that as the equivalence ratio increased, so did the flame temperature, heat flux, and heat release rate. This increase continued until a critical equivalence ratio value of 1.03 was reached, resulting in a flame temperature of 1101.5°C and a heat flux of 140 kW/m2. Furthermore, our study encompassed a pyrolysis test on various composite materials, including Carbon-phenolic, Carbon-BMI, and Carbon-PEKK. The comparative analysis of these materials highlighted the superiority of Carbon-PEKK, which exhibited the lowest mass loss, the highest back-face temperature without experiencing significant material delamination, and the lowest concentration of gas emission species. Importantly, our investigation also delved into the influence of the equivalence ratio on the flow's turbulence characteristics, a critical factor in comprehending the burner's performance and its interactions with materials in the context of fire safety scenarios. These findings contribute to a better understanding of combustion dynamics, which is invaluable for enhancing fire safety measures and developing more efficient flame-generating systems.

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Section: Introductionmentioning

confidence: 99%

Experimental investigations of the fire behavior of composites impacted by kerosene/air turbulent flame

Ogabi,

Manescau,

Chetehouna

2024

Journal of Composite Materials

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“…The flame was significantly affected at an oxygen content below 25 wt%. Rao et al [27] investigated the stability of cyclonic premixed flames using the equivalence ratio experimentally, and analyzed spatial CH* chemiluminescence images through the POD method. The combustion states were classified into five in the range of equivalence ratio from 0.55 to 1.35. In the different combustion states, the POD patterns were characterized by different features.…”

Section: Introductionmentioning

confidence: 99%

Impact of Oxygen Content on Flame Dynamics in a Non-Premixed Gas Turbine Model Combustor

Chen,

Huang,

Wang

et al. 2024

JMSE

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In this study, large eddy simulation (LES) was used to investigate the dynamic characteristics of diffusion flames in a swirl combustion chamber at an oxygen content of 11–23 wt% and temperature of 770 K. The proper orthogonal decomposition (POD) method was employed to obtain flame dynamic modes. The results indicate that oxygen content has a significant impact on the downstream flow and flame combustion characteristics of the swirl combustion chamber. With oxygen content increasing, the size of the recirculation zone is reduced, and the flame field fluctuations are intensified. The pressure and heat release fluctuations under different oxygen contents were analyzed using frequency spectrum analysis. Finally, the flame modes were analyzed using the POD method, and it was found that the coherent structures are asymmetric relative to the local coordinate system. At an oxygen content of 11 wt%, they exhibit larger coherent structures, while at an oxygen content of 23 wt%, they exhibit numerous turbulent structures.

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“…Modern gas turbine combustors are preferred to be operated in a fuel-lean premixed mode of combustion because it lowers the flame temperature and thus NOx emissions while maintaining combustion efficiency [1][2][3][4][5][6]. Stratified combustion, when compared to premixed combustion, can provide greater flame stability and ignitability in extremely lean fuel conditions [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Topology of turbulent premixed and stratified LPG/air flames

Sellan

Balusamy

2022

Aerospace Science and Technology

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Experimental investigations of equivalence ratio effect on nonlinear dynamics features in premixed swirl-stabilized combustor

Cited by 37 publications

References 46 publications

Experimental investigations of the fire behavior of composites impacted by kerosene/air turbulent flame

Experimental investigations of the fire behavior of composites impacted by kerosene/air turbulent flame

Impact of Oxygen Content on Flame Dynamics in a Non-Premixed Gas Turbine Model Combustor

Topology of turbulent premixed and stratified LPG/air flames

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