Solid Oxide Fuel Cell/Gas Turbine Hybrid Cycle Technology for Auxiliary Aerospace Power | Zendy

Christopher J. Steffen | Zendy; Joshua E. Freeh | Zendy; Louis Larosiliere | Zendy

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Solid Oxide Fuel Cell/Gas Turbine Hybrid Cycle Technology for Auxiliary Aerospace Power

Author(s) -

Christopher J. Steffen,

Joshua E. Freeh,

Louis Larosiliere

Publication year - 2005

Publication title -

nasa technical reports server (nasa)

Language(s) - English

Resource type - Conference proceedings

DOI - 10.1115/gt2005-68619

Subject(s) - auxiliary power unit , solid oxide fuel cell , automotive engineering , turbine , proton exchange membrane fuel cell , regenerative fuel cell , aircraft fuel system , engineering , nuclear engineering , process engineering , environmental science , anode , mechanical engineering , internal combustion engine , electrical engineering , hydrogen fuel enhancement , combustion chamber , fuel cells , combustion , vapor lock , chemistry , organic chemistry , electrode , voltage , chemical engineering

A notional 440 kW auxiliary power unit has been developed for 300 passenger commercial transport aircraft in 2015AD. A hybrid engine using solid-oxide fuel cell stacks and a gas turbine bottoming cycle has been considered. Steady-state performance analysis during cruise operation has been presented. Trades between performance efficiency and system mass were conducted with system specific energy as the discriminator. Fuel cell performance was examined with an area specific resistance. The ratio of fuel cell versus turbine power was explored through variable fuel utilization. Area specific resistance, fuel utilization, and mission length had interacting effects upon system specific energy. During cruise operation, the simple cycle fuel cell/gas turbine hybrid was not able to outperform current turbine-driven generators for system specific energy, despite a significant improvement in system efficiency. This was due in part to the increased mass of the hybrid engine, and the increased water flow required for onboard fuel reformation. Two planar, anode-supported cell design concepts were considered. Designs that seek to minimize the metallic interconnect layer mass were seen to have a large effect upon the system mass estimates.Copyright © 2005 by ASME

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