Turbocharger
A turbocharger, or turbo (colloquialism), from the Greek "τύρβη" ("turbulence") is a turbine driven forced induction device used to allow more power to be produced by an engine of a given size.[1][2] A turbocharged engine can be more powerful and efficient than a naturally aspirated engine because the turbine forces more air, and proportionately more fuel, into the combustion chamber than atmospheric pressure alone.
A turbocharger is a compressor pump which takes normal air and condenses it prior to injecting it into the combustion engine. The compressor pump is powered by a turbine and the turbine spinning off the exhaust gas of the combustion engine. In contrast, a supercharger does the same air compression technique but it is power from the drive shaft directly rather than the exhaust gas pressure.
EDG Operability
The Turbo chargers per EDG are needed for Operability. Only the turbocharger lube oil pumps are not needed (in contrast to the EDG lube only pump).
- DBD-93 section 3.6.8 states that the accident mitigating function of Turbo Charger Lube Oil Pump 93P-3D is to maintain engine oil pressure boundary integrity during EDG operation. The normal function is to supply warm lube oil through the turbocharger auxiliary filter to lubricate all moving parts to the turbocharger in readiness for an immediate engine start. The oil pressure boundary is maintained. Technical Guidelines from the EDG vendor (ESI-EMD) provides that in the event of a EDG start and run, without the Turbo Charger Lube Oil Pump available, the engine is fully expected to successfully start and load, and to continue running as needed to complete its safety mission. Should the pump fail completely (but retain the pressure boundary), the EDG would remain operable. The pump discharge pressure issue will be corrected through the Work Management System.
See also