Multi-objective optimizations of air partitioning in a gas turbine combustor

Amani, E.; Rahdan, Parisa; Pourvosoughi, S.

doi:10.1016/j.applthermaleng.2018.12.015

Cited by 27 publications

(8 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The diameter at outlet of combustor is 100 mm. As per calculation, for the geometry used in the study the mass flow rate of air passing through diffuser is 24.33% and that of through casing is 75.67%, which is in accordance to the literature [19,20]. 80 mm swirler diameter, with vane angle of 45° is used in the study has slots of 6 mm diameter which are equally distributed at radial distance of 12 mm as shown in Fig.…”

Section: Methodssupporting

confidence: 73%

Effect of injection angle of primary and secondary holes on the mixing and combustion in a can type combustor using CFD

Shrivastava

Patel

2019

SN Appl. Sci.

View full text Add to dashboard Cite

Combustion is one of the vital process in power generation system and so is the combustor in a Gas Turbine. The performance of combustor has greater impact on the efficiency of the cycle, as a result combustor has always been on the prime focus for researchers to improve the efficiency of gas turbine. The present study is focused on numerical analysis, using ANSYS FLUENT, of combustion performance using slotted swirler with swirl angle of 45°. In this study, considering the importance of primary and dilution injection on combustion performance, the injection angle is varied 60° to − 60° from normal to the liner wall. Furthermore, the curvature of primary and dilution hole is formed in the form of nozzle and diffuser having convergence and divergence angle of 30° and 45°. Because of high swirling effect (S = 1.32), RSM (7 equations) turbulence model is used along with Non-Premixed combustion mechanism by generating β-PDF table. The performance is determined by the mass fraction of CO 2 at outlet. Higher the mass fraction of CO 2 at outlet, signifies better combustion. From the study it is reflected that the slotted swirler have better combustion performance than non-slotted swirler whereas variation of injection angle suggests, injection at 30° clockwise is more suitable. Also, primary injection done through nozzle channel (convergence angle of 45°) and dilution injection through diffuser channel (divergence angle of 45°) results in most efficient combustion performance.

show abstract

Section: Methodssupporting

confidence: 73%

Effect of injection angle of primary and secondary holes on the mixing and combustion in a can type combustor using CFD

Shrivastava

Patel

2019

SN Appl. Sci.

View full text Add to dashboard Cite

show abstract

“…A series of CFD simulations were conducted on the commercial software ANSYS FLUENT, as a common method in studies on combustion characteristics in boiler (Mansir et al, 2021;Jin et al, 2022). Reynolds-Averaged-Numerical-Simulation (RANS) was conducted where the variables in a turbulent flow are assumed as averaged or mean quantities (Amani et al, 2019).…”

Section: Governing Equationsmentioning

confidence: 99%

“…The Sydney swirling flame database (Masri, 2018), a series of reliable databases for combustion simulations, is widely used for validations (Amani et al, 2019;Zong et al, 2022). Among the various swirling flames, the non-premixed flames have wide bluff bodies, which is of the same height as the fuel outlet.…”

Section: Model Validationmentioning

confidence: 99%

Effects of hydrogen addition on NOx formation in a non-premixed methane low-NOx combustor

CHENG,

ZHU,

DENG

2024

Mechanical Engineering Journal

View full text Add to dashboard Cite

Hydrogen is a promising carbon-free fuel, but nitric oxides (NO x ) emissions are significantly increased with higher temperature in hydrogen combustion. Internal flue gas recirculation (IFGR) is one of the most effective NO x reduction techniques in boilers. Previous research has widely reported NO x generation with hydrogen enrichments from a chemical kinetic perspective, however, the NO x formation principles in non-premixed methane/air combustion using IFGR with hydrogen addition are still unclear. This work aims to investigate the effects of hydrogen addition on NO x formation in a non-premixed methane low-NO x combustor using IFGR. The Reynolds-averaged Navier-Stokes (RANS) simulations were conducted on a 5 kW non-premixed combustor with IFGR rate of 17.7%, which generated 11.3 mg/m 3 of total NO x generation in methane combustion. A series of three-dimensional computational fluid dynamics (CFD) simulations with detailed mechanisms was tested on four hydrogen power fractions. The reaction intensities of the main NO x formation pathways were analyzed on reaction rates. The results show that 70% hydrogen power fractions lead to significantly greater NO x concentration to 677.8 mg/m 3 , as high as 60 times of the original concentration. With no additional techniques, the original methane low-NO x combustor is only allowed for hydrogen addition of less than 20% power fraction. The NNH route becomes the second dominant pathway in hydrogen-added flames. Influenced by the growing hydrogen contents, the generation of the NNH route is largely generated from 2 mg/m 3 to 65 mg/m 3 . This work connects the hydrogen addition and the NO x formation pathways in non-premixed methane combustion, and highlights the importance of eliminating thermal NO x and the NNH route to achieve low-NO x combustion rather than sole NO x suppression method, which can provide a reference for designing low-NO x techniques.

show abstract

“…In addition, the average enthalpy 46 of the energy equation is also calculated as shown in eq 11 where σ and σ t are the laminar Prandtl number and turbulent Prandtl number.…”

Section: Numerical Modelsmentioning

confidence: 99%

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Yuan

et al. 2021

ACS Omega

View full text Add to dashboard Cite

The C 1ε = 1.6 standard k – ε equation combined with the steady flamelet model was applied to a methane/dimethyl ether swirl combustion field, and the effects of the dimethyl ether (DME) blending ratio and operating pressure on the flame behavior, including species variation, reaction zone behavior, and flame entrainment, were investigated. The results demonstrated that selected models could better reproduce the trends of the experimental measurements. The downstream reaction zone achieved better calculation accuracy than the outer shear layer of the first recirculation zone. The addition of DME accelerated the accumulation process of H 2 , O, H, and OH radicals. The intermediate radical CH 2 O was rapidly developed by the influence of the H extraction rate under a constant fuel volume flow rate. The reaction zone dimensions were approximately linearly and positively correlated with the DME blending ratio, whereas flame entrainment expressed a lower DME concentration dependence in the high-DME mass-dominated system. The operating pressure significantly impacted the distribution of reactive radicals in the turbulent flame; meanwhile, the flame and reaction zone length showed nonlinear inverse behavior with pressure variation, while the thickness of the reaction zone was always linearly and negatively correlated with pressure. Moreover, the peak flame entrainment rate also experienced a nonlinear decline with pressure elevation; however, the peak positions were not sensitive to pressure fluctuation. Concurrently, the response surface functions for the reaction zone dimensions were established covering the range of 0–1 for the DME blending ratio and 1–5 atm operating pressure, which could provide assistance for combustion condition optimization and combustion chamber design.

show abstract

Multi-objective optimizations of air partitioning in a gas turbine combustor

Cited by 27 publications

References 37 publications

Effect of injection angle of primary and secondary holes on the mixing and combustion in a can type combustor using CFD

Effect of injection angle of primary and secondary holes on the mixing and combustion in a can type combustor using CFD

Effects of hydrogen addition on NO<i><sub>x</sub></i> formation in a non-premixed methane low-NO<i><sub>x</sub></i> combustor

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Contact Info

Product

Resources

About