Development of technologies for hydrogen aircraft

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25ECMP25

Subject Category: Competitive Funding

Responsible Representative: Kenji Togami,team leader, HY-FLARE Project Team (Hydrogen Combustor Facility and Cryogenic Liquid Pump Research and Development for Advanced Hydrogen Aircraft Project Team)
Contact Information: Takuya Mitsukawa(mitsukawa.takuya@jaxa.jp)
Members: Yutaka Kusaka, Takuya Mitsukawa, Hitoshi Arizono

Abstract

According to the specifications of hydrogen aircraft, we prototype and test a "boost pump" to pump up liquid hydrogen from a tank and an "engine pump" to supply high pressure hydrogen to the engine, and support product development by KHI and others. This work was supported by the funding from Development of Core Technologies for Hydrogen Aircraft program in the Green Innovation Fund Projects of NEDO.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

To confirm that there would be no strength problems during the process of the pump cooling from room temperature to the temperature of liquefied hydrogen, JSS3, which can be used with ANSYS Mechanical, was used to calculate the transient temperature conditions and stress under those conditions.

Achievements of the Year

The temperature change when the pump is cooled from room temperature to cryogenic temperatures by the hydrogen flowing inside was calculated using unsteady heat transfer analysis. In addition, a stress analysis of the pump under transient temperature conditions was performed, and it was found that rapid cooling could pose a strength risk, so it is necessary to cool it relatively slowly.

Fig.1: Temperature contour diagram

Fig.2: Stress contour diagram

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: Automatic Parallelization
Number of Processes: 4 - 12
Elapsed Time per Case: 5 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.00

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name	CPU Resources Used (Core x Hours)	Fraction of Usage*2(%)
TOKI-SORA	0.00	0.00
TOKI-ST	12805.66	0.01
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	1004.61	0.08
TOKI-TST	0.00	0.00
TOKI-TGP	0.00	0.00
TOKI-TLM	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	0.00	0.00
/data and /data2	0.00	0.00
/ssd	0.00	0.00

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	0.00	0.00

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System, and Archiver).

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.

ISV Software Licenses Used

ISV Software Licenses Resources
	ISV Software Licenses Used (Hours)	Fraction of Usage*2(%)
ISV Software Licenses (Total)	200.72	0.14

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.