Colloquium: Haroun Saâïd (FPT)
16 December 2024 09:30 - Location: Lecture Hall C, FACULTY OF Aerospace Engineering, Kluyverweg 1, Delft | Add to my calendar
Heat Management and Performance Increase of an Engine Cycle Using Liquid Hydrogen in Aircraft
The Auxiliary Power and Propulsion Unit (APPU) concept replaces the APU of the A321neo with a hydrogen-powered turboshaft system featuring boundary-layer ingestion (BLI), reducing kerosene consumption and emissions. The system utilizes cryogenic hydrogen to cool high-temperature engine components, preheating the hydrogen to improve thermal efficiency through increased lower heating value (LHV). Three scenarios were analyzed: cooling bleed air to enhance core flow, raising turbine inlet temperature (TIT), and intercooling the core flow while increasing compressor pressure ratios. Intercooling with an optimized pressure ratio achieved the highest efficiency gain (3.6%), though challenges at high operational pressure ratios remain. Raising TIT improved efficiency by 0.7%, while reducing bleed flow added 0.2%. The findings highlight that processes maximizing heat extraction by hydrogen yield the greatest efficiency benefits. Intercooling with pressure ratio optimization significantly outperforms other methods, demonstrating its potential for efficiency enhancement.
Supervisor: Dr.-Ing. Alexander Heidebrecht