Exhaust Heat Recovery for Cryogenic Hydrogen-Powered Aircraft: From Conceptual Design to Experimental Validation

Bowen Lu; Lifeng Shi; Man Wang; Si Xiong; Jiong Zhang; Junyi Peng; Kecen Han

doi:10.1016/j.eng.2025.12.013

Engineering ›› :202512013 DOI: 10.1016/j.eng.2025.12.013

Green Aviation Propulsion—Article

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Exhaust Heat Recovery for Cryogenic Hydrogen-Powered Aircraft: From Conceptual Design to Experimental Validation

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Abstract

Cryogenic hydrogen aircrafts are a critical pathway toward carbon neutrality for the aviation industry; however, the low volumetric energy density of hydrogen hinders their development. Exhaust heat recovery for cryogenic hydrogen heating is considered a promising approach towards higher energy efficiency; however, it lacks experimental validation. Herein, we validate the feasibility of recovering engine exhaust to heat liquid hydrogen through systematic experimentation and provide the first quantitative evaluation of the impact of heat recovery on engine thrust performance. Using thermodynamic analysis of a hydrogen-fueled aircraft engine, it is demonstrated that exhaust heat recovery can heat cryogenic hydrogen from 30 to 250 K while maintaining thrust losses below 0.74%, thereby theoretically validating the concept. Subsequently, a heat exchange test rig was constructed to verify the exhaust heat recovery and experimentally investigate the impact of the technology on engine thrust performance. The experiments were conducted under the idle, takeoff, and cruise conditions of the engine, achieving heat-transfer capacities of 9.89, 25.5, and 29.5 kW, respectively. Exhaust heat recovery can heat hydrogen to temperatures beyond 189 K, exceeding the minimum temperature requirement for a combustor (150 K). Additionally, the heat-exchanger-induced engine exhaust duct alteration causes exhaust flow deceleration, resulted in a significant 16.7% thrust reduction. Hence, this study experimentally confirms the feasibility of exhaust heat recovery for cryogenic hydrogen aircraft, identifies existing challenges, and provides a clear direction for future development.

Keywords

Cryogenic hydrogen-powered aircraft / Experimental validation / Exhaust heat recovery / Heat exchange characteristics / Engine thrust

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Bowen Lu, Lifeng Shi, Man Wang, Si Xiong, Jiong Zhang, Junyi Peng, Kecen Han. Exhaust Heat Recovery for Cryogenic Hydrogen-Powered Aircraft: From Conceptual Design to Experimental Validation. Engineering 202512013 DOI:10.1016/j.eng.2025.12.013

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References

Publishing order | Descend order by publishing year | Descend order by cited within

[1]	Lombardo T, Gauch H. Tracking aviation.Why is aviation important [Internet]? Paris: International Energy Agency (IEA); undated [cited 2025 Jan 30]. Available from:

[2]	Ebrahimi A, Rolt A, Jafari S, Anton JH. A review on liquid hydrogen fuel systems in aircraft applications for gas turbine engines. Int J Hydrogen Energy 2024;91:88-105.

[3]	Gnadt AR, Speth RL, Sabnis JS, Barrett SRH. Technical and environmental assessment of all-electric 180-passenger commercial aircraft. Prog Aerosp Sci 2019;105:1-30.

[4]	Epstein AH, O’Flarity SM. Considerations for reducing aviation’s CO₂ with aircraft electric propulsion. J Propuls Power 2019; 35(3):572-82.

[5]	Sethi B. ENABLing cryogEnic hydrogen-based CO₂ free air transport. Report. Geneva: Zenodo; 2021.

[6]	Verstraete D. The Potential of Liquid Hydrogen for long range aircraft propulsion [dissertation]. Bedford: Cranfield University; 2009.

[7]	International Energy Agency (IEA).Global hydrogen review 2022. Paris: International Energy Agency (IEA); 2022.

[8]	AIRBUS. ZEROe:our hydrogen-powered aircraft-developing our first hydrogen-powered commercial aircraft [Internet]. Blagnac: AIRBUS; undated [cited 2025 Jan 30]. Available from:

[9]	Hughes C, Gear C, Milne K, Webb S, Debney D, Kumar N. Report. Our vision for zero-carbon emission air travel. Bedford: FlyZero; 2022.

[10]	Center for high-efficiency electrical technologies for aircraft (CHEETA) [Internet]. Urbana: University of Illinois; undated [cited 2025 Jan 30]. Available from:

[11]	Ji Z, Cheng L, Sun P, Wang Z. Conceptual design and comprehensive study of a dual-mode engine integrated with hydrogen fuel cells and gas turbines for wide-body aircraft. Int J Hydrogen Energy 2025;178:151544.

[12]	Jagtap SS, Childs PRN, Stettler MEJ. Conceptual design-optimisation of a subsonic hydrogen-powered long-range blended-wing-body aircraft. Int J Hydrogen Energy 2024;96:639-51.

[13]	Leitão ABDV, Bringhenti C, Tomita JT, Dos Santos Silva FJ, Xisto C, Grönstedt T. A review of hydrogen aircraft propulsion systems: recent advances and key technologies. Int J Hydrogen Energy 2025;176:151489.

[14]	Boretti A. Towards hydrogen gas turbine engines aviation: a review of production, infrastructure, storage, aircraft design and combustion technologies. Int J Hydrogen Energy 2024;88:279-88.

[15]	Khandelwal B, Karakurt A, Sekaran PR, Sethi V, Singh R. Hydrogen powered aircraft: the future of air transport. Prog Aerosp Sci 2013;60:45-59.

[16]	Smith JR, Mastorakos E. An energy systems model of large commercial liquid hydrogen aircraft in a low-carbon future. Int J Hydrogen Energy 2024;52:633-54.

[17]	Tiwari S, Pekris MJ, Doherty JJ. A review of liquid hydrogen aircraft and propulsion technologies. Int J Hydrogen Energy 2024;57:1174-96.

[18]	European Commission. Report.Liquid hydrogen fuelled aircraft-system analysis. Bruxelles: European Commission; 2003.

[19]	Abedi H, Xisto C, Jonsson I, Grönstedt T, Rolt A. Preliminary analysis of compression system integrated heat management concepts using LH2-based parametric gas turbine model. Aerospace 2022; 9(4):216.

[20]	Patrao AC, Jonsson I, Xisto C, Lundbladh A, Grönstedt T. Compact heat exchangers for hydrogen-fueled aero engine intercooling and recuperation. Appl Therm Eng 2024;243:122538.

[21]	Brewer GD. Hydrogen aircraft technology. Boca Raton: CRC Press; 1991.

[22]

van Dijk IP, Rao AG, van Buijtenen JP. 2009 Sep 7-11; Stator cooling & hydrogen based cycle improvements. Proceedings of the XIX International Symposium on Air Breathing Engines/19th ISABE Conference; New York City, NY, USA. New York City: American Institute of Aeronautics and Astronautics Inc.; 2009. p. 1-10.

[23]	Fulton K. Cryogenic-fueled turbofans: Kuznetsov bureau’s pioneer work on LH2 and LNG dual-fuel engines. Aircr Eng 1993; 65(11):8-11.

[24]	Svensson F. Potential of reducing the environmental impact of civil subsonic aviation by using liquid hydrogen [dissertation]. Bedfordshire: Cranfield University; 2005.

[25]	Corchero G, Montañés JL. An approach to the use of hydrogen for commercial aircraft engines. Proc Inst Mech Eng Part G J Aerosp Eng 2005; 219(1):35-44.

[26]	Helen W, Llambrich J, Davoudi H. Report.Thermal management-roadmap report. Bedford: Aerospace Technology Institute; 2022.

[27]	Srinath AN, Pena López Á, Miran Fashandi SA, Lechat S, Di Legge G, Nabavi SA, et al. Thermal management system architecture for hydrogen-powered propulsion technologies: practices, thematic clusters, system architectures, future challenges, and opportunities. Energies 2022; 15(1):304.

[28]	Otto EW, Hiller KW, Ross PS. Design and performance of fuel control for aircraft hydrogen fuel system. Report. Washington: National Advisory Committee for Aeronautics Collection; 1957.

[29]	Goldsmith JS, Bennett GW. Report. Hydrogen-methane fuel control systems for turbojet engines. Washington: National Aeronautics and Space Administration (NASA); 1974.

[30]	Pratt & Whitney. Pratt & Whitney awarded department of energy project to develop hydrogen propulsion technology [Internet]. East Hartford: Pratt & Whitney; 2022 Feb 21

[31]	[ 2025 Nov 1. Available from:

[32]	Norris G. Pratt & Whitney unveils details of hydrogen-steam hybrid engine cycle [Internet]. New York City: Aviation Week; 2025 Jan 24

[33]	[ 2025 Nov 1. Available from:

[34]	Og˘ur E, Koç A, Köse Ö, Yag˘lı H, Koç Y. Energy, exergy, exergoeconomic, exergy sustainability and exergoenvironmental analyses (5E) of a turbofan engine: a comparative study of hydrogen and kerosene fuels. Fuel 2025;381:133324.

[35]	Og˘ur E, Koç A, Yag˘lı H, Koç Y, Köse Ö. Thermodynamic, economic, and environmental analysis of a hydrogen-powered turbofan engine at varying altitudes. Int J Hydrogen Energy 2024;55:1203-16.

[36]	Caliskan H. Novel approaches to exergy and economy based enhanced environmental analyses for energy systems. Energy Convers Manage 2015;89:156-61.

[37]	Kagan Ayaz S, Caliskan H, Altuntas O. Environmental and second law analysis of a turbojet engine operating with different fuels. Energy 2023;285:129402.

[38]	Goto T, Jige D, Inoue N, Sagawa K. Condensation flow visualization, heat transfer, and pressure drop in printed circuit heat exchangers with straight and wavy microchannels. Int J Refrig 2023;152:234-40.

[39]	Renon C, Jeanningros X. A numerical investigation of heat transfer and pressure drop correlations in gyroid and diamond TPMS-based heat exchanger channels. Int J Heat Mass Transf 2025;239:126599.

[40]	Hosseini SH, Valizadeh M, Zendehboudi A, Song M. General correlation for frost thermal conductivity on parallel surface channels. Energy Build 2020;225:110282.