Variable Bypass Turbofan

Bambery, Daanish (2013). Variable Bypass Turbofan Honours Thesis, School of Engineering, The University of Queensland.

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Author Bambery, Daanish
Thesis Title Variable Bypass Turbofan
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2013-01-01
Thesis type Honours Thesis
Total pages 88
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
This study was conducted to investigate the effect of a variable bypass on the operation and performance of a turbofan engine. The goal was to establish the viability of such an engine, in the context of being able to provide an aircraft, so equipped, with variable performance that could be altered to suit different operational scenarios. From a preliminary stand point it has been determined that a variable bypass is a feasible concept to achieve conditionally optimised performance.

A literature review conducted indicated the viability of a variable bypass turbofan engine, while providing base line data of the simulation of a prototype engine operating on the discussed principles.

An initial simple study was conducted based on the simplified thermodynamical model of a turbofan; this model was parameterised based on the operating Mach number and the bypass ratio.

The results of the preliminary study conducted indicated that as an aircraft increases in velocity the amount of thrust produced by the power plant decreases. Correspondingly the fuel consumption per unit thrust increases.

It can be observed that by varying the bypass ratio of the turbofan the thrust production over a range of Mach numbers can be kept constant. The study indicated that varying the bypass ratio in flight also produces a constant ratio between the thrust and the fuel consumption; this is useful for mission planning as constant thrust fuel consumption considerably simplifies planning and fuel allocation. These characteristics of the engine are extremely advantageous for a military aircraft as this type of engine would allow an aircraft to maintain a constant thrust to weight ratio and constant fuel consumption.

The study further endeavoured to develop a component based approach to model a variable bypass engine. The components were coded in the MATLAB® environment. Each component model was treated as a black box with regard to the entire model thus allowing for the modelling of the sensitivity of the system to individual parameter variations.
Keyword Turbofan

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
Citation counts: Google Scholar Search Google Scholar
Created: Mon, 11 May 2015, 22:25:23 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service