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2022 | OriginalPaper | Chapter

6. The Turbofan Engine

Author : V. Babu

Published in: Fundamentals of Propulsion

Publisher: Springer International Publishing

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Abstract

In the last chapter, the turbojet engine was discussed in detail. Historically, commercial aviation began toward the end of World War II with propeller-driven planes. It soon became apparent that the flight speeds of the propeller planes were limited to low subsonic values. The use of the gas turbine engine in combination with a propulsion nozzle, i.e., the turbojet engine, allowed higher flight speeds to be realized. Although still used for military applications, turbojets lack the efficiency required for commercial applications. This led to the evolution of the turbofan engine.

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next chapter Thrust Calculations
Footnotes
1
This does not mean that there are no emissions. The powerplant that drives the propeller will, of course, have its own emissions.
 
2
Preferred flight Mach number for commercial operation is about 0.9–0.95. The corresponding altitude and flight speed are 12 kms and 1000 km/h. These will change depending upon the prevailing wind speed and direction.
 
3
The airflow rate for the Rolls-Royce Trent engine during take-off is nearly 1000 kg/s.
 
4
Modern high bypass turbofan engines have fan tip diameters approaching 2 m.
 
5
Typical value of fan pressure ratio for high bypass ratio commercial engines is about 1.7.
 
6
Notwithstanding this, the centrifugal load on a fan blade during take-off (maximum power) can be as high as 100 tons.
 
Metadata
Title
The Turbofan Engine
Author
V. Babu
Copyright Year
2022
Book
Fundamentals of Propulsion

Print ISBN: 978-3-030-79944-1

Electronic ISBN: 978-3-030-79945-8

Copyright Year: 2022

DOI
https://doi.org/10.1007/978-3-030-79945-8_6

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