Numerical analysis on combustion instability considering spray response

JAXA Supercomputer System Annual Report February 2024-January 2025

Report Number: R24EDA201C30

Subject Category: Aeronautical Technology

Responsible Representative: Junichi Kazawa, Japan Aerospace Exploration Agency, Aeronautical Technology Directorate, Aviation Environmental Sustainability Innovation Hub
Contact Information: Kazuaki Matsuura, Japan Aerospace Exploration Agency, Aeronautical Technology Directorate, Aviation Environmental Sustainability Innovation Hub.
Members: Kazuaki Matsuura, Yuta Sasaki, Kodai Kato, Yoshio Zama

Abstract

Numerical analysis on combustion instability considering spray response is performed to clarify phenomena and improve prediction capability of CFD in combustion instabilities.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

Phenomena on spray combustion require a high calculation load, and the use of super computer is necessary.

Achievements of the Year

Numerical simulations were performed to investigate combustion instabilities on a coaxially-staged lean-burn fuel injector.

For response of fuel flow rate to back pressure oscillation, a quasi-steady-type response model was employed.

Effects of pilot fuel splits (ratio of pilot fuel flow rate to overall) on frequencies and amplitudes of pressure oscillations in the combustor were investigated.

An example of such results is shown in Figure 2.

Fig.1: Major part of numerical mesh for the combustor.

Fig.2: Effects of pilot fuel splits on frequencies and amplitudes of pressure oscillations in combustion instabilities.

Publications

N/A

Usage of JSS

Computational Information

Process Parallelization Methods: MPI
Thread Parallelization Methods: N/A
Number of Processes: 512
Elapsed Time per Case: 160 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.30

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	7895988.96	0.36
TOKI-ST	5437.25	0.01
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	5.73	0.00
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	124.50	0.08
/data and /data2	115158.33	0.55
/ssd	30720.00	1.65

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)	49.60	0.03

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