NDLI: An Evaluation of the Effects of Water Injection on Compressor Performance

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	White, A. J. Meacock, A. J.
Copyright Year	2003
Abstract	The injection of water droplets into compressor inlet ducting is now commonly used as a means of boosting the output from industrial gas turbines. The chief mechanisms responsible for the increase in power are the reduction in compressor work per unit flow and the increase in mass flow rate, both of which are achieved by evaporative cooling upstream of and within the compressor. This paper examines the impact of such evaporative processes on compressor operation, focussing particular attention on cases with substantial over-spray — i.e., for which significant evaporation takes place within the compressor itself, rather than in the inlet. A simple numerical method is described for the computation of wet compression processes, based on a combination of droplet evaporation and mean-line calculations. The method is applied to a “generic” compressor geometry in order to investigate the nature of the off-design behaviour that results from evaporative cooling. Consideration is also given to the efficiency of the compression process, the implications for choking and stall, and the magnitude of the thermodynamic loss resulting from irreversible phase change.
Sponsorship	International Gas Turbine Institute
Starting Page	181
Ending Page	189
Page Count	9
File Format	PDF
ISBN	079183686X
DOI	10.1115/GT2003-38237
e-ISBN	0791836711
Volume Number	Volume 3: Turbo Expo 2003
Conference Proceedings	ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
Language	English
Publisher Date	2003-06-16
Publisher Place	Atlanta, Georgia, USA
Access Restriction	Subscribed
Subject Keyword	Industrial gases Water Compression Sprays Evaporative cooling Compressors Evaporation Flow (dynamics) Design Geometry Numerical analysis Computation Drops Underground injection Turbines
Content Type	Text
Resource Type	Article

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