The excitation and evolution characteristics thermoacoustic instability in syngas micromixed combustion DOI
Chengfei Tao, Hao Zhou

Physics of Fluids, Год журнала: 2025, Номер 37(2)

Опубликована: Фев. 1, 2025

This paper presents an experimental study of thermoacoustic oscillations synthetic gas (syngas) micromixed combustion, in which the excitation and evolution characteristics were obtained as a function flame equivalence ratio. The results show that initiates when ratio drops below 0.80, with undergoing mode transferring decreases. When is 0.70, second-order oscillation begins to dominate. At 0.50, (640 Hz) dominate first-order (320 Hz). Flame flashback coexists starting at 0.5, where chemiluminescence distribution indicates heat release rate pulsation maximal burner outlet, other radicals vary Low promotes generation amino group radicals, thereby interfering production nitrogen oxides. shape also depends on initially conical flattens innovation this lies its first exploration syngas contributes formulation design criteria for burners. These clarify combustion facilitates prediction control or oscillations.

Язык: Английский

Flame structure transition and instability excitation by pilot fuel in a centrally staged combustor DOI
Pengfei Fu, Shan Li,

Lingyun Hou

и другие.

Physics of Fluids, Год журнала: 2025, Номер 37(1)

Опубликована: Янв. 1, 2025

The pilot stage plays a crucial role in central-staged combustion technology. This study aimed to investigate the impact of jet-type on flame structure and instability novel strong coupled centrally staged swirl gas turbine combustor, using both experiments large eddy simulations (LES). Nonlinear dynamic analyses pressure, including phase recurrence plots, were performed alongside proper orthogonal decomposition structures. It is indicated that richer worsens system. An increase equivalence ratio leads enhanced non-premixed downstream shift heat release region. transition results shape from an attached V-shaped intermittent lifting U-shaped flame. surface statistics LES strain rate progress variable gradient lean rich conditions compared. Under conditions, demonstrates increased sensitivity flow field fluctuations, intensifying vortex–flame interactions. interaction causes large-scale stretching even extinction flame, exacerbating observed this study. These insights offer deeper understanding multi-staged central systems.

Язык: Английский

Процитировано

1
The excitation and evolution characteristics thermoacoustic instability in syngas micromixed combustion DOI
Chengfei Tao, Hao Zhou

Physics of Fluids, Год журнала: 2025, Номер 37(2)

Опубликована: Фев. 1, 2025

This paper presents an experimental study of thermoacoustic oscillations synthetic gas (syngas) micromixed combustion, in which the excitation and evolution characteristics were obtained as a function flame equivalence ratio. The results show that initiates when ratio drops below 0.80, with undergoing mode transferring decreases. When is 0.70, second-order oscillation begins to dominate. At 0.50, (640 Hz) dominate first-order (320 Hz). Flame flashback coexists starting at 0.5, where chemiluminescence distribution indicates heat release rate pulsation maximal burner outlet, other radicals vary Low promotes generation amino group radicals, thereby interfering production nitrogen oxides. shape also depends on initially conical flattens innovation this lies its first exploration syngas contributes formulation design criteria for burners. These clarify combustion facilitates prediction control or oscillations.

Язык: Английский

Процитировано

0