Combustion performance of an adjustable fuel feeding combustor under off-design conditions for a micro-gas turbine

Xing, Chang; Liu, Li; Qiu, Penghua; Shen, Wenkai; Lyu, Yajin; Zhang, Zhuo; Wang, Hui; Wu, Shaohua; Qin, Yukun

doi:10.1016/j.apenergy.2017.10.060

Cited by 15 publications

(2 citation statements)

References 32 publications

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“…To ensure the accuracy of numerical method, the geometric model and boundary conditions used in the numerical simulation are consistent with those in the literature. [ 30 ] Outlet combustion performance in the experimental and numerical test is shown in Figure 3 , and it can be seen that the simulation data are in better agreement with the experimental data, indicating that the numerical method used in this study is appropriate.…”

Section: Methodsmentioning

confidence: 81%

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

Wu,

Zeng,

Liu

et al. 2023

Energy Tech

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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.

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Section: Methodsmentioning

confidence: 81%

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

“…To ensure the accuracy of the numerical method, the fuel−air injection method, the geometric model, and the boundary conditions used in the numerical simulation are consistent with those described in the literature. 30 In the literature, 30 the inlet temperature is 800 K, the inlet pressure is 115 kPa, and the inlet velocity is 54.1 m/s, as well as the inlet air flow and inlet fuel flow being 1245.6 kg/h and 8.7 kg/ h, respectively.…”

Section: Boundary Conditions and Calculationmentioning

confidence: 99%

Numerical Investigation on NH₃/H₂/Air Combustion Flow in a Multiple Direct-Injection Combustor

Wu,

Zeng,

Liu

et al. 2023

Energy Fuels

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To investigate the turbulence combustion characteristics of NH 3 /H 2 /Air in a multiple direct-injection combustor, the effects of equivalence ratio and hydrogen mixing ratio on the mixing characteristics of fuel−air in the mixing-nozzles as well as the flame and emission characteristics in the combustor are analyzed numerically. The results show that the spatial mixing deficiency of fuel−air mixture at the mixing-nozzle outlet is below 1% under all circumstances, which indicates that the mixing-nozzle exhibits satisfactory mixing performance and is capable of achieving the premixed combustion. Furthermore, the intensity of gas turbulence at the mixing-nozzle outlet (inlet of the combustor) is primarily affected by the gas flow within the fuel collision zone. Regarding the flame characteristics, the larger equivalence ratio increases the NH 3 concentration (reducing combustion rate), and the larger hydrogen mixing ratio increases the gas turbulence intensity at the mixing-nozzle outlet (increasing gas flow velocity), which disrupts the stabilized combustion. Moreover, the reaction R18, NH 3 + M ⇔ NH 2 + H + M, inhibits NH 3 consumption and the reactions R20, NH 3 + O ⇔ NH 2 + OH, and R21, NH 3 + OH ⇔ NH 2 + H 2 O, promote NH 3 consumption, while R19, NH 3 + H ⇔ NH 2 + H 2 , initially inhibits and later promotes NH 3 consumption, but primarily plays an inhibitory role. Furthermore, reactions R4, NH + H ⇔ N + H 2 , R11, NH 2 + H ⇔ NH + H 2 , and R28, HNO + H ⇔ NO + H 2 , promote the H 2 formation, and R19, NH 3 + H ⇔ NH 2 + H 2 , inhibits the H 2 formation. As for the emission characteristics, R16, NH 2 + NO ⇔ N 2 + H 2 O, and R28, HNO + H ⇔ NO + H 2 , inhibit and promote NO generation in the upstream region of the combustor, respectively, while R36, NO 2 + H ⇔ NO + OH, promotes NO generation in the whole area.

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Experimental analysis and multi-objective optimization of flame dynamics and combustion performance in methane-fueled slit-type combustors

Gao,

Tang,

Cai

et al. 2024

Applied Energy

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Combustion performance of an adjustable fuel feeding combustor under off-design conditions for a micro-gas turbine

Cited by 15 publications

References 32 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

Numerical Investigation on NH₃/H₂/Air Combustion Flow in a Multiple Direct-Injection Combustor

Experimental analysis and multi-objective optimization of flame dynamics and combustion performance in methane-fueled slit-type combustors

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Combustion performance of an adjustable fuel feeding combustor under off-design conditions for a micro-gas turbine

Cited by 15 publications

References 32 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

Numerical Investigation on NH3/H2/Air Combustion Flow in a Multiple Direct-Injection Combustor

Experimental analysis and multi-objective optimization of flame dynamics and combustion performance in methane-fueled slit-type combustors

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Numerical Investigation on NH₃/H₂/Air Combustion Flow in a Multiple Direct-Injection Combustor