Design of a low emission combustor for an automotive gas turbine

Sanborn, J. W.; Mongia, H. C.; Kidwell, J. R.

doi:10.2514/6.1983-338

Cited by 8 publications

(2 citation statements)

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“…(1994). As reported by Sanborn, Mongia and Kidwell (1983), NOxEl can be reduced by a factor of approximately 50 relative to a conventional diffusion flame by lean-direct injection with an optimum arrangement of swirlers. This can be partially explained by studying the nonreacting flow field characteristics; e.g., the influence of comer expansion on a 60-degree hub swirler - Fig.…”

Section: Introductionmentioning

confidence: 65%

“…The calibration of the state-of-the-art turbulent combustion models with non-reacting single module testing in an axisyminetric test section has been done by several investigators, e.g., Sanborn et al (1983), Sattelmayer et al (1992, Razdan et al (1994). However, as shown by Nikjooy et aL (1993, I993a) the nonreacting flow field characteristics established by 60-degree production hub swirlers are quite different in a single axisymmetric rig and a five-cup sector rig because of swirler-to-swirler interaction.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%