NDLI: Numerical Simulation on Circumferential Staging of an Aeroengine LPP Combustor

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mao, Ronghai Shang, Mingtao
Copyright Year	2013
Abstract	With the increasing stringency of the CAEP regulation on the pollutant emissions, combustors in lean burn architecture are being widely developed by aero-engine manufacturers to achieve low NOx emission performance with competitive margins to CAEP thresholds. A three-dimensional numerical simulation has been carried out in the present investigation to study an LPP combustor and circumferential staging effects on its main stage, for potential application to ACAE CJ-1000A aeroengine. A realizable k-ε turbulent model has been employed by the simulation, together with a Discrete Phase model based on Lagrangian methodology for the two-phase flow. The generic performances of the combustor, mainly in terms of flow and flame structures, fuel-air enhanced mixing performance, total pressure loss, combustion efficiency, outlet temperature distribution, and pollutant emissions have been analyzed. It was found that a large-scale central recirculation region is formed in the flame tube, which is beneficial to the stability of the combustion. The total pressure loss of the combustor is insensitive to the circumferential staging. Under approach mode the circumferential staging enhances the combustion efficiency from 73.8% without staging to 93.8% with staging; meanwhile the local turbulent flame speed increases more than two times. However the OTDF deteriorates from 0.30 without staging to 0.78 with staging, although the RTDF is found to be insensitive to the circumferential staging. The radial temperature distribution profiles are found to be pretty flat during the whole LTO cycle. The NOx emission without circumferential staging is simulated to be 68% reduction relative to CAEP 6. The circumferential staging, however, increases NOx emission to 65% reduction relative to CAEP 6. While gaining higher combustion efficiency, the major drawbacks of the circumferential staging are degradations of OTDF and NOx emission. Although the numerical results seem to be quite encouraging, the uncertainty of CFD results especially the temperature distribution and emissions might be tremendous. Experimental work has to follow up for further clarification.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791855119
DOI	10.1115/GT2013-95286
Volume Number	Volume 1B: Combustion, Fuels and Emissions
Conference Proceedings	ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2013-06-03
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Temperature distribution Cycles Turbulence Uncertainty Stability Computer simulation Computational fluid dynamics Combustion Aircraft engines Fuels Pressure Flow (dynamics) Emissions Flames Pollution Simulation Two-phase flow Nitrogen oxides Combustion chambers
Content Type	Text
Resource Type	Article

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