Experimental investigation of combustion instabilities of a mesoscale multinozzle array in a lean-premixed combustor

Kang, Hyebin; Lee, Taesong; Jin, Ukhwa; Kim, Kyu Tae

doi:10.1016/j.proci.2020.06.099

Cited by 21 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pressure loss γ and OTDF are expressed in the following Equation ( 7) and ( 8), respectively. [24] γ ¼ P in À P out P in (7) Where P in is the inlet pressure, Pa, P out is the outlet pressure, Pa. OTDF ¼ T out;max À T out;ave T out;ave À T in (8) Where T out,max is the maximum temperature in the combustor outlet temperature distribution, K, T out,ave is the combustor outlet average temperature, K, T in is the combustor inlet temperature, K. In order to extend turbine life, the combustor outlet temperature needs to be as uniform as possible, namely, a small OTDF.…”

Section: Single-factor Test Analysismentioning

confidence: 99%

“…This work was financially supported by Shanghai Science and Technology Project (21DZ1207203). [Correction added on 5 February 2024, after first online publication: Minor corrections have been updated in Figures 4,6,and 8. ]…”

Section: Acknowledgementsmentioning

confidence: 99%

“…It is found that the H 2 /air flame has high frequency oscillations and the CH 4 /air flame has low frequency oscillations. The instability of the combustor was experimentally studied by Kang et al [ 8 ] it was demonstrated that the collective motion of entire flame rather than the individual local flame motion play a key role in the development of flame oscillations. A number of measures are employed to improve flame stability and ignition performance.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structure Optimization of Hydrogen‐Fueled Multiple Direct‐Injection Trapped Vortex Combustor Using Response Surface Method

Wu,

Zeng,

Liu

et al. 2023

Energy Tech

View full text Add to dashboard Cite

A hydrogen‐fueled multiple direct‐injection trapped vortex combustor is proposed to improve the unstable combustion and reduce NO emission. The effects of bluff‐body depth, bluff‐body height, and bluff‐body angle on the combustion flow characteristics are analyzed. NO emission is used as the main response value, the response surface method (RSM) is adopted to optimize the bluff‐body depth, bluff‐body height, and bluff‐body angle. The results show that the bluff‐body depth, bluff‐body height, and bluff‐body angle have significant effects on the NO emission, with the increase of the three parameters, NO emission first drops and then rises, but the effects on the pressure loss and outlet temperature distribution factor (OTDF) are very small. After optimization by RSM, the optimal bluff‐body parameters are the bluff‐body depth a = 56.5 mm, the bluff‐body height b = 128.9 mm, and the bluff‐body angle α = 77.6°. Under these circumstances, the maximum radial distances of the front concave vortex and the rear concave vortex reach 48 mm and 57 mm, respectively, which enhances the combustion stability. Furthermore, NO emission of 1.64 ppmv in the optimization structure is significantly optimized compared to NO emission of 4.32 ppmv in the original structure.

show abstract

Section: Single-factor Test Analysismentioning

confidence: 99%

Section: Acknowledgementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure Optimization of Hydrogen‐Fueled Multiple Direct‐Injection Trapped Vortex Combustor Using Response Surface Method

Wu,

Zeng,

Liu

et al. 2023

Energy Tech

View full text Add to dashboard Cite

show abstract

“…Hydrogen possesses a high chemical reactivity and a small Lewis number, which leads to the flame being more prone to wrinkle, and the heat release rate fluctuation is intensified. As a result, thermoacoustic instabilities become much more significant when using hydrogen fuel for carbon emission reductions [4][5][6], which restricts the development of hydrogen gas turbines.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermoacoustic Instabilities Using the Helmholtz Method in a Swirled Premixed Combustor

Yu,

2024

Processes

View full text Add to dashboard Cite

The Helmholtz method is developed to predict the self-excited thermoacoustic instabilities in a gas turbine combustor, combining flame describing functions, the measured damping rates under the firing condition, and the non-uniform spatial distributions of the physical parameters. The impact of the hydrodynamic and geometrical parameters on the thermoacoustic instabilities is investigated. The measured damping rates show lower values under a hot condition compared with those in a cold state. The experimental results indicate that the relative errors of the predicted eigenfrequencies and the velocity fluctuation levels are below 10%. The pressure amplitude decreases and the phase increases in the axial direction, indicating a typical 1/4-wavelengh mode. At a higher equivalence ratio, the mode shape in the axial direction becomes steeper due to the elevated fluctuation amplitude at the pressure antinode after enhancing the thermal power. When the air flow rate increases, the discrepancies between the pressure shape on the flame tube side and that on the plenum side are reduced. The velocity fluctuation level increases as the combustor length increases at a constant damping rate. In fact, the velocity fluctuation level first increases and then declines, caused by more significant damping rates when employing longer flame tubes. Self-excited thermoacoustic instabilities can be well predicted using the proposed method.

show abstract

Experimental investigation of combustion dynamics and NOx/CO emissions from densely distributed lean-premixed multinozzle CH4/C3H8/H2/air flames

Jin

Kim

2021

Combustion and Flame

View full text Add to dashboard Cite

Experimental investigation of combustion instabilities of a mesoscale multinozzle array in a lean-premixed combustor

Cited by 21 publications

References 18 publications

Structure Optimization of Hydrogen‐Fueled Multiple Direct‐Injection Trapped Vortex Combustor Using Response Surface Method

Structure Optimization of Hydrogen‐Fueled Multiple Direct‐Injection Trapped Vortex Combustor Using Response Surface Method

Analysis of Thermoacoustic Instabilities Using the Helmholtz Method in a Swirled Premixed Combustor

Experimental investigation of combustion dynamics and NOx/CO emissions from densely distributed lean-premixed multinozzle CH4/C3H8/H2/air flames

Contact Info

Product

Resources

About