Combustor Design Criteria Validation. Volume II. Development Testing of Two Full-Scale Annular Gas Turbine Combustors

Mongia, H. C.; Reynolds, R.; Coleman, E.; Bruce, T.

doi:10.21236/ada067689

Cited by 11 publications

(4 citation statements)

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“…The version in ACC is a modified form of the eddy break up model (Mongia et al, 1979). The original eddy break up model (EBU) is described by Magmussen and Hjertger (1977).…”

Section: Two Step Eddy Break Up Modelmentioning

confidence: 99%

“…The original EBU model predicts rapid heat release even in low temperature fuel/air mixtures in the absence of flow recirculation and other flame stabilization mechanisms. In the modified version of the EBU model (Mongia et al, 1979) the reaction rates can be kinetic or mixing limited. A kinetic rate and a mixing rate is calculated for each of the two global reactions (shown below) and the smaller of the two is used as the source term.…”

Section: Two Step Eddy Break Up Modelmentioning

confidence: 99%

“…The multi-dimensional Computational Combustion Eynamics models (CCD) in the empirical/analytical combustion design methodology of Mongia and his coworkers (Mongia et al (1979), Mongia (1993)) have been used primarily for providing qualitative guidance in the design process. In order to get quantitative guidance from CCD, Rizic and Mongia (1986, 1990, 1990a, 1990b, 1991, 1993b, 1995 proposed a "hybrid modeling" approach which was calibrated with a number of existing product and technology combustors including diffusion, rich-quench-lean and premix flames.…”

Section: Introductionmentioning

confidence: 99%

“…Mongia and his coworkers have used successfully a modified eddybreakup model (EBU) with a two-step kinetic since 1977 (see Mongia et al (1979)) for a variety of gas turbine combustors. Our studies for diffusion flames have shown marginal improvement with Monte Carlo scalar PDF over EBU, Tolpadi et al (1997).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dry Low Emissions Premixer CCD Modeling and Validation

Hura

Joshi

Mongia

et al. 1998

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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Computational Combustion Dynamics has been used extensively at General Electric Company for combustion applications. This paper demonstrates an application of Advanced Combustion Code to GE’s lean premixed dry low NOx emissions LM2500 and LM6000 gas turbine combustors. A methodology for anchoring the Double Annular Counter-Rotating Swirler (DACRS) exit conditions to Laser Doppler Velocity data from a reacting single cup experiment is described. The DACRS exit velocity profiles and turbulence parameters are inlet boundary conditions for the annular combustor simulation. Since over 80 per cent of the total air enters the combustor via the premixers, inaccuracies in these boundary conditions have a significant impact on the predicted flame shape, liner temperatures and emissions. The paper shows comparisons between measured and predicted velocity in a rectangular duct equipped with a single DACRS. The k-ε turbulence model and the two-step eddy break up/eddy dissipation combustion models are used to predict the reacting flow field of the natural gas/air flame. The inlet velocity profiles are developed first to match the LV data and the observed flame impingement location at nominal settings of the inlet turbulence parameters. The sum square error between measured and predicted velocity is used as the optimization function. Next, a design of experiment computational study is conducted to determine the inlet turbulence length scale and kinetic energy in order to further improve the data match. The eddy break up model is shown to be more robust than the eddy dissipation model. The eddy dissipation model resulted in slow combustion rates, and high fuel and carbon monoxide emissions.

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“…The version in ACC is a modified form of the eddy break up model (Mongia et al, 1979). The original eddy break up model (EBU) is described by Magmussen and Hjertger (1977).…”

Section: Two Step Eddy Break Up Modelmentioning

confidence: 99%

Section: Two Step Eddy Break Up Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dry Low Emissions Premixer CCD Modeling and Validation

Hura

Joshi

Mongia

et al. 1998

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

View full text Add to dashboard Cite

show abstract

Hypotheses-Driven Combustion Technology and Design Development Approach Pursued Since Early 1970s

Mongia¹,

Ajmani²,

Sung

2020

50 Years of CFD in Engineering Sciences

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Isothermal flow in a gas turbine combustor — a benchmark experimental study

Koutmos

McGuirk

1989

Experiments in Fluids

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Abstract. An experimental investigation of the three-dimensional flow field within a water model of a can-type gas turbine combustion chamber is presented. Flow visualisation demonstrated that internal flow patterns simulated closely those expected in real combustors. The combustor comprised a swirl driven primary zone, annulus fed primary and dilution jets and an exit contraction nozzle. LDA measurements of the three mean velocity components and corresponding turbulence intensities were obtained to map out the flow development throughout the combustor. Besides providing information to aid understanding of the complex flow events inside combustors, the data are believed to be of sufficient quantity and quality to act as a benchmark test case for the assessment of the predictive accuracy of computational models for gas-turbine combustors. I IntroductionNew designs of gas turbine combustion systems are often aimed at simultaneous improvements in several, if not all, combustor performance parameters. High priority is usually given to expansion of the range of stable operating conditions, improvement of exit temperature traverses, and (more recently) reduced pollutant emissions. All of these features are crucially dependent on internal flow patterns and the associated rates of mixing. This fact alone has motivated the need for a better and more fundamental understanding of the processes taking place inside a combustion chamber. Further, no design techniques currently in general use can produce a combustor design that does not require subsequent development and the development process for a system which meets at least some of the above goals has also to date been largely experimental and empirical. Whilst this approach has been reasonably successful, increased use of computational procedures in parallel to experimentation would be expected to accelerate the development of improved combustor designs and reduce development costs. This is particularly evident in view of the number of interacting flow parameters within the combustor such as swirler flow, jet and cooling slot flows, influence of downstream exit contraction nozzle etc. Needless to say, the availability of suitable experimental data is also critical to the development and validation of mathematical models for combustor flows (Bruce et al. 1979;Coupland and Priddin 1986;Sturgess and Syed 1980). The motivation behind the investigation described herein was therefore twofold: (i) to provide comprehensive measurements which can be used with confidence to assess and further develop existing numerical models, and (ii) at the same time to provide data which allow better understanding of the parameters controlling the complex aerodynamics of combustor flows.Because of the complexity of such flows the approach usually adopted for the validation of numerical models (and thus the acquisition of suitable data) is to divide the real flow into a number of well-controlled component flows that emphasise only one or two of the important physical processes at a time. Many of t...

show abstract

Combustor Design Criteria Validation. Volume II. Development Testing of Two Full-Scale Annular Gas Turbine Combustors

Cited by 11 publications

References 0 publications

Dry Low Emissions Premixer CCD Modeling and Validation

Dry Low Emissions Premixer CCD Modeling and Validation

Hypotheses-Driven Combustion Technology and Design Development Approach Pursued Since Early 1970s

Isothermal flow in a gas turbine combustor — a benchmark experimental study

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