Fuel Burn Reduction of Hybrid Aircraft Employing an Exhaust Heat Harvesting System
- 1 March 2022
- journal article
- research article
- Published by American Institute of Aeronautics and Astronautics (AIAA) in Journal of Propulsion and Power
- Vol. 38 (2), 241-253
- https://doi.org/10.2514/1.b38393
Abstract
This study investigates the application of an exhaust gas energy harvesting hybrid powertrain to three general aviation aircraft with reciprocating spark-ignition piston engines. The hybridization process involves downsizing the internal combustion engine to save weight and installation of an exhaust heat harvesting system composed of a harvester, a generator, lithium-ion traction battery, an electrical conversion system, and an electric motor. Novel calculations for a hybrid powertrain performance envelope are presented that estimate the upper limits to the degree of downsizing and mass of the harvester. An organic Rankine cycle (ORC) has been proposed as a potential compact, high-efficiency harvester. Five hydrofluroolefins (which have no ozone depletion potential and very low global warming potential) are considered as organic fluids for the ORC. It is found that R-1336mzz(Z) performs best in this application. Each ORC design parameter is investigated, and an optimized design with 14.3% thermal efficiency is found. At this efficiency, the internal combustion engine may be downsized up to 34.5%. The fuel burn reduction at this degree of downsizing may be as high as 12.7–14.5%.Keywords
Funding Information
- Department of Education, Skills and Employment, Australian Government (Research Training Program)
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