Title: Exergy analysis of gas-turbine systems with high fogging compression

Authors: Kyoung Hoon Kim, Hyung-Jong Ko, Horacio Perez-Blanco

Addresses: School of Mechanical Engineering, Kumoh National Institute of Technology, 1 Yangho, Gumi, Gyeongbuk 730-701, Korea. ' School of Mechanical Engineering, Kumoh National Institute of Technology, 1 Yangho, Gumi, Gyeongbuk 730-701, Korea. ' Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, 204 Reber Building, University Park, PA 16802-1412, USA

Abstract: Gas-turbine cycles with high fogging compression could offer enhanced efficiency and low complexity. Whereas compression power and heat rates decrease when small amounts of water (up to 2% of air flow by mass) are injected at the machine inlet, increased injection amounts could allow implementation of regeneration, further decreasing the heat rate. In this study, an exergy analysis is carried out for two high-fogging cycles. The theoretical projections show that high-injection improves the efficiency from 47% at a pressure ratio of 6-55.5% at a pressure ratio of 22.

Keywords: water injection; droplet evaporation; wet compression; gas turbine cycles; regenerative Brayton cycle; exergy analysis; gas turbines; fogging compression.

DOI: 10.1504/IJEX.2011.037212

International Journal of Exergy, 2011 Vol.8 No.1, pp.16 - 32

Received: 07 Sep 2009
Accepted: 06 May 2010

Published online: 30 Nov 2010 *

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