Numerical analysis on combustion instability considering spray response
JAXA Supercomputer System Annual Report February 2025-January 2026
Report Number: R25EDA201C30
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.(matsuura.kazuaki@jaxa.jp)
- Members: Kazuaki Matsuura, Yuta Sasaki, Takuma Harasawa, 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. A new model of fuel-supply response to oscillating air flows under development was applied for preliminary analysis. Effects of response parameter of its main injector on frequencies and amplitudes of pressure oscillations in the combustor were investigated for two different pilot injector designs. An example of such results are shown in Figure 2.
Fig.1: Major part of numerical mesh for the combustor.
Fig.2: Effects of response parameter of main injector 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 - 2400
- Elapsed Time per Case: 200 Hour(s)
JSS3 Resources Used
Fraction of Usage in Total Resources*1(%): 1.16
Details
Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.
| System Name | CPU Resources Used(Core x Hours) | Fraction of Usage*2(%) |
|---|---|---|
| TOKI-SORA | 27929808.48 | 1.27 |
| TOKI-ST | 953483.16 | 0.99 |
| TOKI-GP | 0.00 | 0.00 |
| TOKI-XM | 0.00 | 0.00 |
| TOKI-LM | 18.87 | 0.00 |
| TOKI-TST | 0.00 | 0.00 |
| TOKI-TGP | 0.00 | 0.00 |
| TOKI-TLM | 0.00 | 0.00 |
| File System Name | Storage Assigned(GiB) | Fraction of Usage*2(%) |
|---|---|---|
| /home | 0.00 | 0.00 |
| /data and /data2 | 102400.00 | 0.67 |
| /ssd | 30720.00 | 1.87 |
| 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 Used(Hours) | Fraction of Usage*2(%) | |
|---|---|---|
| ISV Software Licenses(Total) | 324.12 | 0.23 |
*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.
JAXA Supercomputer System Annual Report February 2025-January 2026