Aircraft engines may be classified in several ways, including by operating cycle, cylinder arrangement, or method of thrust production. All aircraft engines are heat engines that convert the chemical energy of fuel into heat energy and then into mechanical energy. In reciprocating engines, this mechanical energy is delivered as shaft horsepower, which is converted into … Read more
Engine Fire Detection Systems Several different types of fire detection system are installed in aircraft to detect engine fires. Two common types used are spot detectors and continuously loop systems. Spot detector systems use individual sensors to monitor a fire zone. Examples of spot detector systems are the thermal switch system, the thermocouple system, the … Read more
In reciprocating aircraft engines, precise valve timing is essential for efficient combustion, power delivery, and temperature control. The valve operating mechanism coordinates cam action, tappet movement, push rod travel, and rocker arm motion to ensure each valve opens and closes at the correct moment. Proper synchronization of these components directly affects volumetric efficiency, smooth operation, … Read more
The compressor section of the gas turbine engine has many functions. Its primary function is to supply air in sufficient quantity to satisfy the requirements of the combustion burners. Specifically, to fulfill its purpose, the compressor must increase the pressure of the mass of air received from the air inlet duct, and then, discharge it … Read more
For aircraft operating at higher altitudes, managing the intake air-fuel density is critical to achieving sustained engine performance. This section covers the engineering differences between internally driven superchargers and externally driven turbosuperchargers, the fluid loops that control them, and automated management devices like density and absolute pressure controllers. Introduction Since aircraft operate at altitudes where … Read more
There are various types or classes of propellers, the simplest of which are the fixed-pitch and ground-adjustable propellers. The complexity of propeller systems increases from these simpler forms to controllable-pitch and complex constant-speed systems (automatic systems). Various characteristics of several propeller types are discussed in the following paragraphs, but no attempt is made to cover … Read more
The Hamilton Standard Hydromatic propeller is a classic mechanical-hydraulic design widely used on legacy cargo aircraft and radial engines. Unlike older counterweight systems, it uses a completely enclosed pitch-changing mechanism driven by a balance of engine oil pressure, boosted governor pressure, and centrifugal force. For students and technicians, mastering this system is key to understanding … Read more
The combustion section houses the combustion process, which raises the temperature of the air passing through the engine. This process releases energy contained in the air/ fuel mixture. The major part of this energy is required at the turbine or turbine stages to drive the compressor. About 2/3 of the energy is used to drive … Read more
The bearing and sealing system of a gas turbine engine is essential for maintaining rotor stability, controlling lubrication, and preventing oil contamination of the airflow. Because turbine engine rotors operate at extremely high rotational speeds and temperatures, precise bearing support and effective sealing are critical to ensure safe, efficient, and reliable engine operation. These components … Read more
Gas turbine engines are started by rotating the high-pressure compressor. On dual-spool, axial flow engines, the high pressure compressor and N1 turbine system is only rotated by the starter. To start a gas turbine engine, it is necessary to accelerate the compressor to provide sufficient air to support combustion in the combustion section, or burners. … Read more
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