This document provides a review of aircraft fuel systems. It discusses the key components and purposes of fuel systems, including fuel tanks, pumps, valves, filters and indicators. There are two main types of fuel systems - gravity feed systems commonly used in small aircraft, and pressure feed systems used in large aircraft with engines located far from fuel tanks. The paper also outlines some important subsystems like fuel heating, cross-feeding and jettison systems. Overall, the document reviews the design and components of aircraft fuel systems and how they work to safely and reliably deliver fuel to aircraft engines during all phases of flight.
The fuel system is designed to provide an uninterrupted flow of clean fuel from the fuel tanks to the engine. The fuel must be available to the engine under all conditions of engine power, altitude, attitude, and during all approved flight maneuvers . Fuel systems differ greatly from aircraft to aircraft due to the relative size and complexity of the aircraft in which they are installed.
The fuel system is designed to provide an uninterrupted flow of clean fuel from the fuel tanks to the engine. The fuel must be available to the engine under all conditions of engine power, altitude, attitude, and during all approved flight maneuvers . Fuel systems differ greatly from aircraft to aircraft due to the relative size and complexity of the aircraft in which they are installed.
This presentation is an brief insight into what ATF is, its important properties, few standards followed in world in ATF Quality and ATF contamination.
A carburetor performs this function mechanically; relying on differences in air pressure inside the carburetor to regulate fuel flow. EFI (Electronic Fuel Injection) performs this function electronically using computer-controlled fuel injectors to admit pressurized fuel as required by throttle position.
This PPT gives a brief explanation about the fuel system used in commercial airplanes. This includes how it's done, different ways to be done and the difficulties faced during the process.
Automobile Engineering Unit 2 - Anna universitysuresh n
The 2nd unit of automobile engineering describe about carburetor, types of carburetor, ignition system such as coil ignition, magneto ignition and electric ignition system. And also it describe about supercharger and turbocharger
Mech4u presents Lecture Slides
Subject: IC Engine and Gas Turbine
Topics Include :
Carburation, Injection and supercharging
Simple carburettor
Essential Parts of a Carburettor
Introduction, MPFI system.
Injection system of C.I. engines,
Functional Divisions of MPFI System
Introduction of supercharging,
Types Of Super charging
Methods Of Super Charging
a) fuel strainer
b) float chamber
c) main fuel metering and idling nozzles
d) choke and throttle
Different types of MPFI systems are, namely
Port injection
Throttle body injection
D-MPFI system
L-MPFI system
Electronic control system,
Fuel system, and
Air induction system
Air injection systems
Solid injection systems
Individual pump and nozzle system
Unit injector system
Common rail system
Distributor system
Centrifugal type
Root's type
Vane type
Independently driven compressor or blower, usually driven by an electric motor.
Ram effect.
Underpiston supercharging.
Kadenacy system (applied to two stroke engines).
Engine driven compressor or blower.
This presentation is an brief insight into what ATF is, its important properties, few standards followed in world in ATF Quality and ATF contamination.
A carburetor performs this function mechanically; relying on differences in air pressure inside the carburetor to regulate fuel flow. EFI (Electronic Fuel Injection) performs this function electronically using computer-controlled fuel injectors to admit pressurized fuel as required by throttle position.
This PPT gives a brief explanation about the fuel system used in commercial airplanes. This includes how it's done, different ways to be done and the difficulties faced during the process.
Automobile Engineering Unit 2 - Anna universitysuresh n
The 2nd unit of automobile engineering describe about carburetor, types of carburetor, ignition system such as coil ignition, magneto ignition and electric ignition system. And also it describe about supercharger and turbocharger
Mech4u presents Lecture Slides
Subject: IC Engine and Gas Turbine
Topics Include :
Carburation, Injection and supercharging
Simple carburettor
Essential Parts of a Carburettor
Introduction, MPFI system.
Injection system of C.I. engines,
Functional Divisions of MPFI System
Introduction of supercharging,
Types Of Super charging
Methods Of Super Charging
a) fuel strainer
b) float chamber
c) main fuel metering and idling nozzles
d) choke and throttle
Different types of MPFI systems are, namely
Port injection
Throttle body injection
D-MPFI system
L-MPFI system
Electronic control system,
Fuel system, and
Air induction system
Air injection systems
Solid injection systems
Individual pump and nozzle system
Unit injector system
Common rail system
Distributor system
Centrifugal type
Root's type
Vane type
Independently driven compressor or blower, usually driven by an electric motor.
Ram effect.
Underpiston supercharging.
Kadenacy system (applied to two stroke engines).
Engine driven compressor or blower.
Switched mode power supplies have become ubiquitous in electronics as they provide precise voltages including high power with very high efficiency. The efficiency of these power supplies requires low loss power transistors and the design requires measurement of highly dynamic voltages. Voltage levels can vary from millivolts to hundreds of volts in some applications. In this seminar, the proper use of a digital oscilloscope to accurately measure these voltages will be discussed along with key aspects of instrument performance such as noise and overdrive recovery that affect the accuracy of the measurement.
(Slides from Live webinar on September 25, 2014, presented by Mike Schnecker. Watch the webinar On-Demand here: http://goo.gl/LkjUUg)
Attendees Will Learn:
An overview of switched mode power supplies
Common measurements (ie, what to measure and why)
Circuit loading and probing considerations
How instrument specifications impact measurement accuracy
Switched mode power supplies have become ubiquitous in electronics as they provide precise voltages including high power with very high efficiency. The efficiency of these power supplies requires low loss power transistors and the design requires measurement of highly dynamic voltages. Voltage levels can vary from millivolts to hundreds of volts in some applications.
In this webinar, the proper use of a digital oscilloscope to accurately measure these voltages will be discussed along with key aspects of instrument performance such as noise and overdrive recovery that affect the accuracy of the measurement.
A simple heart rate monitor using 8051 microcontroller. The device senses the heart rate from the finger tip using IR reflection method and displays it on a three digit seven segment display in beats per minute
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Review of theModern developments in Suction processes of IC EnginesIJERA Editor
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Experimental Evaluation of Electronic Port Fuel Injection System in Four Stro...IJTET Journal
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This presentation was part of the course requirements of MEC 401 (Internal Combustion Engines) which I took in fall 2016. I made all the slides (participants in my group never works lol) and here I am uploading for the public if it can be of any help. Contact me for any info if needed.
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Review of Aircraft Fuel System
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Review of Aircraft Fuel System
Shivnag Sharma1
, Prashant Singh2
, Richa Sinha3
, Kalpit P. Kaurase4
1
UG. Student, Aeronautical Department, School of Egg. & IT.MATS UNIVERSITY Raipur, Chhattisgarh, India
2
PG Students, Mechanical Department, School of Engg. & IT.MATS UNIVERSITY Raipur, Chhattisgarh, India
3
UG. Student, Aeronautical Department, School of Engg. & IT.MATS UNIVERSITY Raipur, Chhatisgarh, India
4
Asst.Prof, Aeronautical Department, School of Engg. & IT.MATS UNIVERSITY Raipur, Chhattisgarh, India
Abstract
This paper contain the content of basic review of an aircraft fuel system .This paper cover the various fuel system
and fuel subsystem used in aircraft .Purpose of an aircraft fuel Sub system to monitors the fuel supply, its control,
storage, drainage and also maintain stability of aircraft.. Basically the purpose of fuel system is to supply the fuel
in all phase of including landing ,takeoff, Banking and sharp maneuvering fuel system should also supply the
sufficient amount of neat and clean fuel at required pressure. Types of fuel system may vary in aircraft but all the
aircraft keeps their own fuel system. The fuel system must be used keeping the centre of gravity to be stable in mind.
Keyword :- aircraft fuelling system, stability margin, aerial refueling
1. Introduction
The fuel system is one of the most important systems in an aircraft and its purpose to stores, manages and supplies
the fuel to the aircraft engine. The aircraft fuel system supplies a proper amount of clean fuel at all operating
conditions to the engine.
Fuel system must be so designed such that it supplies a proper amount of fuel to the engine at various phases of
flight such as changes in altitude, rapid maneuvering, sudden acceleration or deceleration.
The fuel system means a complete package of equipments which help from storage of fuel up to the delivery to the
tank in a proper way i.e. fuel tanks, fuel pipe lines, valves, fuel indicators, fuel pressure pumps, warning signals etc.
A fuel system should always be free from the tendency of vapor lock.
From the birth of the aircraft systems till now, there is much advancement made in the fuel systems. The fuel system
design, construction and components selection vary from aircraft to aircraft and also depend on the number of
engines employed. A light weight single engine aircraft will have simple or box type fuel system whereas a heavy
aircraft with twin engine will have a complex fuel system such as integral type of fuel tanks.
2. Types of Fuel System
Generally, the fuel systems are classified into two broad categories on the basis of method to supply the fuel to
engine . In small and light aircraft generally gravity feed fuel system is used while in large turbine engine aircraft
pressure feed fuel system is used
2.1 Gravity feed system
This system makes use of the force of gravity to deliver the fuel in the power plants from storage tanks. It is most
commonly used in high wing light aircrafts in which the engine is located below the main wing as a result below the
fuel tank (as the fuel tanks are generally located on main wings). This is the simplest and cheapest mode of fuel feed
system as no additional complex components are used and uses only the gravity force. The main disadvantage of this
system is it is affected by vapor lock which stops the fuel to flow through the pipelines.
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Vapor lock is caused by high altitude and high temperature operations; the solution to vaporization is to provide a
positive pressure with the help of fuel pump. [1]
Fig 1: - Cessna 152 gravity fuel system
2.2 Pressure Feed System:
Most of the aircrafts are designed such that engine is mounting above the fuel tank for e.g. mid wing or low wing
configured aircraft, or the engine is far away from the fuel tank, in this case the gravity fuel feed system cannot be
used and therefore a need of positive pressure is developed to supply the fuel in adequate amount to the engines. It
generally makes use of two electric pumps for the feeding of fuel into the engines. As stated above, the fuel system
and its components vary from aircraft to aircraft the use of two electric pumps is the most basic method used. The
complexity of fuel system increases with increase in aircraft size; a large transport aircraft or a maneuverable
combat aircraft.
Fig 2:-Beech Bonanza K35 fuel system
3. Fuel System Components:-
The fuel system of an aircraft mainly consist of fuel tanks, fuel pumps, valves, filters and strainers, warning
components, quantity indicators, heaters etc.
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3.1 Fuel pump:-
Fuel pumps are used to supply fuel through the system. Their main another or from engine back to tanks. Basically 3
types of fuel pumps are used:
3.1.1 Vane type pump:-
It is a constant displacement type pump. Uses a rotor which turns the vanes in the cylinder and these vanes act to
push fuel through the system.
Fig 3:-Booster pump
3.1.2 Centrifugal boost pump
They are used to supply fuel from one tank to other or from tank to engine. Centrifugal pumps are electrically driven
and can operate at different speeds as per requirement. Low speed is used to supply fuel while starting and high
speeds are used to supply fuel from one tank to another.
3.1.3 Ejector pump
Ejector pumps are normally used to scavenge (eliminate) fuel from remote areas. It works on the venturi principle
Fig 4:-Centrifugal Fuel Booster Pump
Fig 5:-Venturi Type Fuel Pump
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3.2 Fuel Tanks-
Fuel tanks are used to store the fuel, they are made of such materials that it does not react with fuels. Different types
of aircraft use various fuel tanks and depend on the location of tank and size of aircraft. The three basic types of fuel
tanks in use are-Rigid Removable, Integral & Bladder Type.
Fig 6:- Integral Type Fuel Tank
Figure shows an integral type fuel tank, these are inbuilt or integrally built into the structure of the aircraft either
wing or fuselage. With the help of synthetic rubber and seams are sealed so as to produce an area to store the fuel
inside the aircraft structure.Bladder type fuel tanks are generally made from neoprene or a similar material which is
resistant to fuel. [3] It is simply a reinforced rubberized bag.Rigid removable fuel tanks are the oldest type of fuel
tanks used and are now replaced by integral type and bladder type due to limitation of space and weight. [3]
Fig 7:-Box Type Fuel Tank
3.3 Fuel Valves-
Selector valves are used in aircraft fuel system to shut-off fuel supply, cross feed and transfer fuel. They can be
operated manually or electrically driven.
3.3.1 Hand operated valves:-
Hand operated valves are used on small aircraft and are either cone type or puppet type.
3.3.2 Motor operated valves:-
Motor operated valves are used in the fuel system of large aircraft. They are either electrically motor driven or
solenoid driven.
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Motor operated valve uses a motor driven sliding gate, when the gate is in open position the fuel is drawn in and
vice versa. [3]
3.4 Filters and Strainers-
It is necessary that the fuel supplied to the engines must be clean i.e. free of contamination and due to this
requirement; the aircraft fuel system is equipped with strainers and filters.
Generally, a micro filter is used made up of replaceable cellulose filter element. It is capable of removing foreign
particles of size varying from 10-25 microns.
Fig 8:-Main Fuel Strainer
The strainer’s function is to prevent foreign particles from entering the engine and also traps water (if present in the
fuel or system).
Fig 9:-Fuel Strainer
3.5 Fuel Quantity Indicators-
It is necessary for every aircraft’s fuel system to have fuel quantity indicators equipped in it, so that the amount of
fuel present in the fuel tanks can be known for the purpose of safe flight. Some basic types of fuel indicators used
are as follows:
3.5.1 Sight glass gauge-
It is the simplest type of fuel quantity indicator. It is generally a glass tube placed on same level as the fuel tank. It
works on the principle that a liquid seeks its own level.
3.5.2 Mechanical type Indicator-
It is also known as direct reading gauge and is usually located on the fuel tank. It consists of a float attached to the
indicator via. Mechanical means, as the level of fuel in tank changes it directly points it in the dial gauge.
6. Vol-1 Issue-1 2015 IJARIIE-ISSN(O)-2395-4396
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Fig 10:-Float and Lever Type Fuel Gauge
3.5.3 Electrical type Indicator-
This type of fuel indicator consists of a float type transmitter in the fuel tank and an indicator in the cockpit. The
transmitter consists of a variable resistor at the outside of fuel tank, as the fuel level changes the transmitter sends a
signal, which shows a changing level of fuel in the tank.
4. Electronic type Indicator-
Capacitance type electronic fuel does not have any moving parts in it; rather it uses only the dielectric value of air
and fuel to show the quantity of fuel remaining in the tank.
Fuel Sub-Systems:-
Aircraft fuel sub-systems like: fuel jettison, fuel heating cross feeding are also required.
4.1 Fuel jettison System-
This system is generally used in large aircrafts to jettison (eject) or dump the fuel to lower the gross weight so that
the aircraft attains minimum possible landing weight which enables the aircraft for safe landing. This system
comprises a combination of pumps, valves and fuel lines to eject fuel on board during an in-flight emergency.
This enormously reduces the weight of the aircraft, so that it is of allowable landing weight. A jettison system
dumps enough fuel in 10 minutes for general aviation aircraft and 15 minutes for a transport type aircraft. [3]The
dump valves provided in the fuel tank allows the fuel to flow through the jettison valves in each wing tip.
Fig 11:-Fuel Jettison System
4.2 Fuel Heating-
As a large turbine engine aircraft operates at higher altitudes, and there is very low temperature due to which ice
formation takes place. The same thing also happens in cold areas in normal altitude also and hence it is necessary to
melt the ice particles for proper combustion and utilization of fuel. The ice particles otherwise will clog the filters.
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The fuel is then passed through a heat exchanger which uses engine oil or compressor bleed air to bring the fuel to
an acceptable temperature. [3]
4.3 Cross Feeding-
Cross feed mechanism system allows the fuel to be used from other tank. Cross feed mechanism is used on large
aircraft. It is used because of the following reasons:
Failure of engine;
Problem with the fuel tank(s);
(one or more)
Redistribute fuel for weight and balance purpose (for stability margin).
Fig 12:-cross feed mechanism
5. Conclusions
This paper concludes the discussion of aircraft fuel system used in modern aircraft with brief review of their
component and sub system. Various type of fuel sub system used in aircraft such as cross feed mechanism, fuel
jettison system .These system is very useful in aircraft.In emergency circumstances is helps to works in normal
condition.
6. References
[1]. Sharma O.P.: “Aircraft Systems”, Volume-IV
[2]. Mishap R., Kayla A.: “Study of Aircraft Fuelling System And Refueling Operation”, Advances In Aerospace
Science And Applications. ISSN 2277-3223 Volume 3, Number 3 (2013), Pp. 161-166
[3]. Goral Z., Zakrzewski P., “Aircraft Fuel Systems and Their Influence on Stability Margin”, Transactions of the
Institute of Aviation No. 183
[4]. Langton R., Clark C: “Aircraft Fuel Systems”, Wiley Publications, ISBN 978-0-470-05708-7