RANS Modelling of Turbulence in Combustors

Jiang, Leiyong

doi:10.5772/intechopen.68361

Cited by 8 publications

(9 citation statements)

References 53 publications

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“…For the combined combustor-NGV simulations, the eddy dissipation (EDS) combustion model and discrete ordinate radiation model were used to account for species and energy source terms, and the Engineering Failure Analysis 6 realizable k-ε model was selected for turbulence momentum and scalar transfers. These models were carefully evaluated with the comprehensive database measured from a model combustor [12][13][14]. For the air-splitting over the air management elements of the combustion can, the predicted values were closely correlated to the results calculated from the semi-empirical correlations of discharge coefficients [9].…”

Section: Numerical Approach and Physical Modelsmentioning

confidence: 93%

An Effective Approach for Turbine Hot Component Failure Analysis

Jiang¹,

Patnaik²

2020

Engineering Failure Analysis

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One advantage of computational fluid dynamics (CFD) is its ability to reveal the physics or nature of practical engineering problems in detail, allowing engineers and scientists to develop rigorous, effective, and efficient solutions. In this chapter, an effective approach to investigate gas turbine hot component failure is demonstrated, and the mid-span cracking of nozzle guide vanes (NGVs) is used as an example. It is a two-step approach. In the first step, a 60° combustor sector with simplified NGVs and thermocouples attached is simulated; and in the second step, NGV sectors are simulated, where each NGV sector is comprised of one high-fidelity probe NGV and several dummy NGVs. The former identifies the NGV having the highest thermodynamic load and provides the inlet boundary conditions for the latter. The CFD analysis successfully identified the root causes of the NGV damage pattern and mid-span cracking, i.e., the hot streaks from the combustor and inadequate internal cooling.

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Section: Numerical Approach and Physical Modelsmentioning

confidence: 93%

An Effective Approach for Turbine Hot Component Failure Analysis

Jiang¹,

Patnaik²

2020

Engineering Failure Analysis

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“…Finally, some assessments related to the numerical simulation modelling had been taken into account for a better performance in this study. For example, L. Y. Jiang [57] performed an assessment of the turbulence modeling under gas turbine conditions focusing on the turbulence models most widely used in practical engineering, which are the RANS (Reynolds-averaged Navier-Stokes) models, and concluded that all the turbulence models tested can capture the flow features or patterns. However, for the quantitative predictions of velocity, temperature and species fields, different levels of performance were revealed.…”

Section: Bibliographic Reviewmentioning

confidence: 99%

CFD Analysis of the Combustion of Hydrogen Fuel on a CFM56-3 Combustor

Domingues

Brójo

Oliveira

2022

Volume 3: Advanced Materials: Design, Processing, Characterization and Applications; Advances in Aerospace Technology

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In the present work is made an overview of the use of hydrogen in aviation, the modifications needed to convert a conventional gas turbine to use hydrogen and a CFD simulation of an existent gas turbine burning hydrogen. The CFD simulation was done in a CFM56-3 combustor burning Jet A (as a reference standard) and hydrogen, with the intention of evaluate the viability of conversion of existent gas turbines to hydrogen, in a combustion point of view, by analyzing the emissions through ICAO’s LTO cycle while burning this fuel. ANSYS Fluent 2020R2 was the software used to perform the numerical study. The RSM was the viscous model used. Only the NOx emissions were assessed as pollutant once the hydrogen combustion products are reduced to water vapor and NOx. These emissions were evaluated through a detailed mechanism and the NOx model available on ANSYS to get a better concordance with the ICAO’s values. During this study, several sensibility studies were carried out for hydrogen burn, for instance, the analysis of the air flow with/without swirl in the primary zone and different inlet pressure and temperature for fuel.

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“…The methane/air mixing in the mixer was solved with ANSYS CFD Premium 16 . The realisable k-ε turbulence model and its settings were selected for this simulation, which were successfully applied to a model combustor fueled with gaseous propane 17 , and a can-annular gas turbine combustor fired by liquid jet fuel 6 .…”

Section: Numerical Simulation Of a Simple Venturi Methane/air Mixermentioning

confidence: 99%

An alternative approach to evaluate fuel/air mixing quality

Jiang¹

2021

Aeronaut. j.

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A practical method to evaluate quantitatively the uniformity of fuel/air mixing is essential for research and development of advanced low-emission combustion systems. Typically, this is characterised by measuring an unmixedness parameter or a uniformity index. An alternative approach, based on the fuel/air equivalence ratio distribution, is proposed and demonstrated in a simple methane/air venturi mixer. This approach has two main advantages: it is correlated with the fuel/air mixture combustion temperature, and the maximum temperature variation caused by fuel/air non-uniformity can be estimated. Because of these, it can be used as a criterion to check fuel/air mixing quality, or as a target for fuel/air mixer design with acceptable maximum temperature variation. For the situations where the fuel/air distribution non-uniqueness issue becomes important for fuel/air mixing check or mixer design, an additional statistical supplementary criterion should also be used.

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RANS Modelling of Turbulence in Combustors

Cited by 8 publications

References 53 publications

An Effective Approach for Turbine Hot Component Failure Analysis

An Effective Approach for Turbine Hot Component Failure Analysis

CFD Analysis of the Combustion of Hydrogen Fuel on a CFM56-3 Combustor

An alternative approach to evaluate fuel/air mixing quality

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