Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-11085
For citation please use:
Main Title: An alternative architecture of the Humphrey cycle and the effect of fuel type on its efficiency
Author(s): Stathopoulos, Panagiotis
Type: Article
Language Code: en
Abstract: Conventional gas turbines are a very mature technology, and performance improvements are becoming increasingly difficult and costly to achieve. Pressure‐gain combustion (PGC) has emerged as a promising technology in this respect, due to the higher thermal efficiency of the respective ideal gas turbine cycles. The current work analyzes two layouts of the Humphrey cycle for gas turbines with pressure‐gain combustion. One layout replicates the classical layout of gas turbine cycles, whereas an alternative one optimizes the use of pressure‐gain combustion by ensuring the operation of the combustor at stoichiometric conditions. In parallel, both cycle layouts are studied with two different fuels—hydrogen and dimethyl ether—to account for differences in combustion specific heat addition and its effect on cycle efficiency. The current work concludes with an attempt to benchmark the maximum losses of a plenum to achieve efficiency parity with the Joule cycle, for a given pressure gain over a PGC combustor. It is found that the cycle layout with stoichiometric combustion results in an increase in thermal efficiency of up to 7 percentage points, compared to the classic cycle architecture. Moreover, the thermal efficiency of the new layout is less sensitive to the turbine inlet temperature, especially at low compressor pressure ratios. The study of the two fuels has shown that the larger mass specific heat addition leads to higher cycle thermal efficiency and should be considered during the fuel choice. Finally, the maximum allowable plenum pressure loss that results to efficiency parity with the Joule cycle has been computed for a given combustor pressure gain. For turbine inlet temperatures above 1500°C, pressure gain above 1.6 would allow for at least 20% relative pressure drop in the plenum. The respective pressure gain becomes considerably higher for lower turbine inlet temperatures.
URI: https://depositonce.tu-berlin.de/handle/11303/12210
http://dx.doi.org/10.14279/depositonce-11085
Issue Date: 6-Jul-2020
Date Available: 16-Dec-2020
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): gas turbines
Humphrey cycle
hydrogen
pressure‐gain combustion
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2020
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Energy Science & Engineering
Publisher: Wiley
Publisher Place: New York, NY
Volume: 8
Issue: 10
Publisher DOI: 10.1002/ese3.776
Page Start: 3702
Page End: 3716
EISSN: 2050-0505
Appears in Collections:FG Experimentelle Strömungsmechanik » Publications

Files in This Item:
ESE3_ESE3776.pdf
Format: Adobe PDF | Size: 1.64 MB
DownloadShow Preview
Thumbnail

Item Export Bar

This item is licensed under a Creative Commons License Creative Commons