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On the Analysis of Energy Efficient Aircraft Engines

Oskar Thulin (Institutionen för tillämpad mekanik, Strömningslära)
Gothenburg : Chalmers University of Technology, 2017. ISBN: 978-91-7597-635-8.
[Doktorsavhandling]

Aero engine performance analysis is highly multidimensional using various measures of component performance such as turbomachinery and mechanical efficiencies, and pressure loss coefficients. Using conventional performance analysis, relying on only the laws of thermodynamics, it is possible to understand how the performance parameters affect the component performance, but it is difficult to directly compare the magnitude of various loss sources. A comprehensive framework has been detailed to analyze aero engine loss sources in one common currency. As the common currency yields a measure of the lost work potential in every component, it is used to relate the component performance to the system performance. The theory includes a more detailed layout of all the terms that apply to a propulsion unit than presented before. The framework is here adopted to real gases to be used in state of the art performance codes. Additionally, the framework is further developed to enable detailed studies of two radical intercooling concepts that either rejects the core heat in the outer nacelle surfaces or uses the core heat for powering of a secondary cycle. The theory is also extended upon by presenting the installed rational efficiency, a true measure of the propulsion subsystem performance, including the installation effects of the propulsion subsystem as it adds weight and drag that needs to be compensated for in the performance assessment.

Nyckelord: Turbofan, Ultra high bypass ratio, Variable area fan nozzle, Engine weight estimate, Exergy analysis, Translating cowls, Aircraft engine, Performance modelling,Aero engine, Multiple pivoting flaps, Installed propulsion



Denna post skapades 2017-11-09. Senast ändrad 2017-11-13.
CPL Pubid: 253028

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära (2005-2017)

Ämnesområden

Hållbar utveckling
Maskinteknik
Rymd- och flygteknik
Farkostteknik
Energiteknik
Strömningsmekanik och akustik

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


First and Second Law Analysis of Future Aircraft Engines


First and second law analysis of intercooled turbofan engine


A Mission Assessment of Aero Engine Losses


First and Second Law Analysis of Radical Intercooling Concepts


Examination

Datum: 2017-12-06
Tid: 10:00
Lokal: HB4 Hörsalsvägen 8, Göteborg
Opponent: Professor Guillermo Paniagua, School of Mechanical Engineering, Purdue University, United States of America

Ingår i serie

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie 4316