NDLI: Investigation of Turbulent Combustion in Humid Air Using a Level-Set Flamelet Library Approach

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Engdar, Ulf Hermann, Fredrik Nilsson, Per Klingmann, Jens
Copyright Year	2004
Abstract	To meet the demands of high electrical efficiencies in combination with low emissions for gas turbine-based power plants, wet cycles have gained new interest. The combustion chamber is a key component in such a power plant. Detailed investigations are necessary to gain insight into the formation of hazardous emissions such as CO and NOx. In this paper, computational fluid dynamics (CFD) has been employed to perform the investigations. To examine the influence of humidity content in the inlet air stream on the mean flame position and CO and NOx emissions, the humidity content was varied from 0 to 31%. The CO emissions are a measure of incomplete combustion. The inlet temperature and the maximum flame temperature were held constant for all computations. The influence of different combustor loads was also investigated. This will influence the flame position, which is important for emission formation. The flame under investigation is a lean premixed propane flame, stabilized by a bluff body. The turbulent combustion has been modeled with the level-set flamelet library approach (FLA). This model includes a detailed chemical mechanism, which is of great importance when emissions are to be predicted. To illustrate this importance, the FLA model is compared with a simple eddy break-up model and validated against known experimental data at dry condition. The level-set flamelet library method shows very good agreement with the experimental data for both the temperature profile and the CO and NOx emissions. The simple eddy break-up model is only able to predict the temperature profile fairly well while the important emissions are being greatly overestimated. The computations have shown that the flame position, and hence the residence time, is most sensitive to the change in combustor load-while the degree of humidification appears to be of less importance. The CO emissions rise with an increase in the degree of humidification at constant load, while the opposite behavior is true for NOx emissions. At a constant level of humidification, the CO emissions fall with an increase in load and again, the opposite behavior is observed for NOx emissions. A map of emission indices for CO and NOx under different load conditions as a function of humidification can be generated. This map shows an operation window within which both the CO and NOx emissions are quite low.
Sponsorship	International Gas Turbine Institute
Starting Page	215
Ending Page	224
Page Count	10
File Format	PDF
ISBN	0791841669
DOI	10.1115/GT2004-53364
e-ISBN	0791837394
Volume Number	Volume 1: Turbo Expo 2004
Conference Proceedings	ASME Turbo Expo 2004: Power for Land, Sea, and Air
Language	English
Publisher Date	2004-06-14
Publisher Place	Vienna, Austria
Access Restriction	Subscribed
Subject Keyword	Cycles Turbulence Temperature Computational fluid dynamics Combustion Temperature profiles Electrical efficiency Stress Emissions Flames Computation Eddies (fluid dynamics) Nitrogen oxides Power stations Combustion chambers Turbines
Content Type	Text
Resource Type	Article

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