Page 105 - The Jet Engine
P. 105
10: Fuel system
Contents Page
Introduction 95
Manual and automatic control 96
Fuel control systems 99
Pressure control (turbo-propeller engine)
Pressure control (turbo-jet engine)
Flow control
Combined acceleration and speed
control
Pressure ratio control
Electronic engine control 111
Speed and temperature control amplifiers
Engine supervisory control
Low pressure fuel system 112
Fuel pumps 112
Plunger-type fuel pump
Gear-type fuel pump
Fuel spray nozzles 114
Fuel heating 116
Effect of a change of fuel 116
Gas turbine fuels 117
Fuel requirements
Vapour locking and boiling
Fuel contamination control
INTRODUCTION fuel to the fuel spray nozzles, which inject it into the
combustion system (Part 4) in the form of an
1. The functions of the fuel system are to provide atomized spray. Because the flow rate must vary
the engine with fuel in a form suitable for combustion according to the amount of air passing through the
and to control the flow to the required quantity engine to maintain a constant selected engine speed
necessary for easy starting, acceleration and stable or pressure ratio, the controlling devices are fully
running, at all engine operating conditions. To do automatic with the exception of engine power
this, one or more fuel pumps are used to deliver the selection, which is achieved by a manual throttle or
95
