A4 Conference proceedings

Experimental and analytical analysis of aero derivative micro gas turbine heat transfer and performance


Publication Details
Authors: Grönman Aki, Sallinen Petri, Honkatukia Juha, Backman Jari, Uusitalo Antti, Nerg Janne, Jaatinen-Värri Ahti
Publication year: 2019
Language: English
Title of parent publication: Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition
ISBN: 978-0-7918-5871-4
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract

Small-scale gas turbines offer a light weight alternative to engine generators. Despite the many benefits of a micro gas turbine, its efficiency cannot match that of its competitors. This discrepancy is mostly due to Reynolds number losses in turbomachinery but also partly due to internal heat transfer problems, which degrade the performance below what is adiabatically expected. In general, a good understanding about the heat transfer inside the machine is of paramount importance, and innovative engineering solutions are required to improve overall performance. Overall, one of the less exploited areas in the public literature is the effect of the generator cooling approach. Small jet engines can be used as a simple and affordable foundation to produce portable aero derivative micro gas turbines for demonstrating the specific challenges they face but also to study different flow configurations. This study presents combined analytical and experimental analysis of a portable aero derivative micro gas turbine with three main objectives. The first objective is to evaluate the contributions of different heat leakage losses on the overall performance. The second objective is to compare the influence of different generator cooling approaches. And the third objective is to evaluate the effect of different technical modifications. As a result, suggestions are given about the most suitable machine layouts and the importance of several design choices.


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Last updated on 2020-20-03 at 10:03