All/More Electric Aircraft Engine & Airframe Systems - Turbo & Jet ...

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“Conventional” Philosophy (Cont.) Extraction and distribution of secondary power systems affect the design and performance of the engine: Increase both complexity and weight, Increase maintenance and operational costs, Increase aircraft drag (profile and induced), Increase turbine entry temperature (TET), Increase sfc, Reduce thrust. Unclassified 6
“Conventional” Philosophy (Cont.) Alternative secondary power sources while on ground and/or emergencies may include an auxiliary power unit (APU), ground connections and the use of ram air turbine (RAT). Bleeding air from the engine is largely inefficient and a large amount of power is wasted for no useful purpose. Hydraulic systems are often sized for loads that are small in duration thus increasing the mass and power requirements of the systems. Conventional secondary power systems were developed during the years that fuel was relatively inexpensive and flight envelope have not been optimized for maximum efficiency. Unclassified 7
Page 1 and 2: The 9th Israeli Symposium on Jet En
Page 3 and 4: Evolution of the All/More Electric
Page 5: “Conventional” Philosophy (Cont
Page 9 and 10: Effects of Takeoff on Aircraft Oper
Page 11 and 12: Effects of Bleed Air and Shaft Powe
Page 13 and 14: “Electric Aircraft” Philosophy
Page 17 and 18: “Electric Aircraft” Unclassifie
Page 19 and 20: “Electric Aircraft” Improved re
Page 23 and 24: Secondary Power Systems (SPS) Distr
Page 25 and 26: Conventional Secondary Power System
Page 27 and 28: Typical Power Level of Electrical L
Page 29 and 30: AC Power Generation & Regenerative
Page 31 and 32: B787 “Bleedless” System Archite
Page 33 and 34: B787 Hybrid Electrical Power Distri
Page 35 and 36: Conventional Vs. Electric ECS Conve
Page 37 and 38: Actuation System The four‐engine
Page 39 and 40: Impact of Aircraft and Engine Desig
Page 41 and 42: Impact of Aircraft and Engine Desig
Page 43 and 44: Impact of the AEA Concept Implicati
Page 45 and 46: More Electric Engine (MEE) Challeng
Page 47 and 48: IAI More “Electric Aircraft” B7

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