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Study on future space transportation system – combined cycle engine (JAXA-Tohoku Univ. collaborative course)

JAXA Supercomputer System Annual Report February 2022-January 2023

Report Number: R22ECWU07

Subject Category: Cooperative Graduate School System

PDF available here

  • Responsible Representative: Sadatake Tomioka, Associate Principal Researcher, Research and Development Directorate, 4th Unit.
  • Contact Information: Sadatake Tomioka (RInsertHereD directorate, 4th Research Unit)(tomioka.sadatake@jaxa.jp)
  • Members: Sadatake Tomioka, Hironobu Nishiguchi, Kota Kubosaki, Hattori, Ryota Ito, Shota Hatta

Abstract

Fully reusable launch vehicle will reduce the transportation cost and increase the space launch demands. Introduction of airbreathing engine will afford system weigth penalty necessary to realise reuablity by reducing on-board oxygen consumption. Enabling prediction of scramjet engine and scramjet-rocket combined cycle engine performance is prime target of the present study, especially on reacting flow within combustor with presence of separation and within cooling channel.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

In combustors, supersonic / subsonic flows are mixed and chemical reaction takes place. In cooling channel flow, supercritical / subcritical flows are mixed and endothermic reaction takes place. In both cases, huge calculation resource is required, and JSS matchs the requirement for prompt output .

Achievements of the Year

A unsteady analysis was conducted using RANS/LES hybrid method in CRUNCH CFD to evaluate the effect of fuel type on combustion characteristics in a dual-mode combustor with two-staged injection.

As a result, changes of the static temperature contour under combustion state were observed; in addtion, differences of the combustion characteristic owing to the fuel type were confirmed (Fig. 1).

To investigate the effect of the inhomogeneous airflow caused by the scramjet intake on the combustion state of the scramjet combustor, a steady-state RANS analysis using CFD++ was performed.

The CFD results showed that the difference of the boundary layer thickness changed the combustion area and the pressure distribution. In addition, the CFD analysis results reproduced that the flame shape in the vicinity of the cavity changed the flame went back upstream along the sidewall from the cavity front edge in the case of thin boundary layer thickness.

Annual Reoprt Figures for 2022

Fig.1: Instantaneous static temperature contours of the dual-mode combustor with the two-stage-fueled injector (1st stage fuel: equivalence ratio = 0.4, 2nd stage fuel: equivalence ratio = 0.1)

 

Publications

– Peer-reviewed papers

Nishiguchi, H., et.al., ‘Unsteady Numerical Analysis of a Dual-Mode Scramjet Combustor with Cavity,’ Trans. JSASS (accepted).

– Oral Presentations

Hironobu Nishiguchi, Masatoshi Kodera, Kan Kobayashi, and Sadatake Tomioka, “Study on Fuel Types and Combustion Characteristics of Two-Staged Fueled Dual-mode Scramjet Combustor,”JSASS Northern Branch 2023 Annual Meeting and the 4th Symposium on Reusable Space Transportation Vehicles Northern Branch of the Japan Society for Aeronautical and Space Sciences, 2023.

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 32 – 9600
  • Elapsed Time per Case: 60 Hour(s)

JSS3 Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.94

 

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 18740745.48 0.82
TOKI-ST 1571678.98 1.57
TOKI-GP 0.00 0.00
TOKI-XM 520.79 0.33
TOKI-LM 13997.86 0.94
TOKI-TST 6211.28 0.16
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 1022.50 0.93
/data and /data2 58856.00 0.45
/ssd 7473.00 1.04

 

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)
4860.62 3.38

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

JAXA Supercomputer System Annual Report February 2022-January 2023