Auxiliary Power Unit Aircraft Function

2 3 6 the combustible usually gas is mixed in the combustion chamber with air.

Auxiliary power unit aircraft function.

An mt is a mechanism that uses the flow of a gas to convert thermal energy into mechanical energy. Apu is the smallest engine on airplanes. An auxiliary power unit or apu allows an aircraft to operate autonomously without reliance on ground support equipment such as a ground power unit an external air conditioning unit or a high pressure air start cart. Auxiliary power units are usually found on large aircraft and naval ships as well as some large land vehicles.

Starting power for the main engines. In airliners apu s are usually located at the very rear of the aircraft below the tail. Apu generators provide auxiliary electrical power for running aircraft systems on the ground when the main engines aren t running and no ground electrical power is available. The technology used in the mt is derived from diesel engine turbochargers aircraft auxiliary power systems and automotive designs mts consist of a compressor combustor turbine and generator as shown in fig.

An auxiliary power unit apu is a device on a vehicle that provides energy for functions other than propulsion they are commonly found on large aircraft and naval ships as well as some large land vehicles. Applications include powering environmental systems for pre cooling or preheating the cabin and providing power for crew functions such as preflight cabin cleanup and galley kitchen operation. Aircraft apus generally produce 115 v alternating current ac at 400 hz rather than 50 60 hz in mains supply to run the electrical systems of the aircraft. Pneumatic power for cabin air conditioning systems.

Shaft power for other pneumatic and hydraulic systems. Knowing this will be an explanation of auxiliary power units apu and how they are involved in the operation of an aircraft. How an auxiliary power unit works. Design of auxiliary power unit apu for co operation with turboshaft engine p 9 the section that comes below presents types of aircraft engines.

Apu is necessary to start up the main engines it also powers the airplane s electronics. Others can produce 28 v.