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Noise suppression technology for aircraft jet engines

JAXA Supercomputer System Annual Report April 2020-March 2021

Report Number: R20EA0716

Subject Category: Aeronautical Technology

PDF available here

  • Responsible Representative: Tatsuya Ishii, Aeronautical Technology Directorate, Propulsion Research Unit
  • Contact Information: Shunji ENOMOTO(enomoto.shunji@jaxa.jp)
  • Members: Shunji Enomoto, Tatsuya Ishii

Abstract

Ultra high bypass ratio aviation jet engines have a smaller sound absorbing liner area than conventional engines. In this project, we will develop sound-absorbing device technology that provides high noise reduction performance even with a small-sized sound-absorbing liner.

Reference URL

Please refer to https://www.aero.jaxa.jp/eng/research/ecat/dante/ .

Reasons and benefits of using JAXA Supercomputer System

To perform many LES calculations by changing the shape of the sound absorbing liner and the incident sound frequency, the calculation performance and the storage capacity of JAXA supercomputer system were required.

Achievements of the Year

The sound absorption performance of an acoustic liner was evaluated using the calculation method described in JAXA-SP-20-008. Numerical calculations were performed for a laminar flow of M=0.3 in a two-dimensional geometry, which simulates the flowduct test facility to measure the sound absorption performance of the acoustic liner under a glazing flow environment. An example is shown in Fig. 1. Compared to the baseline geometry without glazing flow (BL M=0), the sound absorption coefficient with glazing flow (BL M=0.3) is much lower. In this fiscal year, we investigated a new sound absorption device and proposed a shape that shows sound absorption performance as shown in (new device M=0.3). A model test based on this shape showed higher sound absorption performance than that of the conventional sound absorbing liner.

Annual Reoprt Figures for 2020

Fig.1: Sound absorption coefficient

 

Annual Reoprt Figures for 2020

Fig.2: Examples of instantaneous values of sound pressure (BL M=0)

 

Annual Reoprt Figures for 2020

Fig.3: Examples of instantaneous values of sound pressure (BL M=0.3)

 

Publications

– Non peer-reviewed papers

1) ENOMOTO Shunji, ISHII Tatsuya, Evaluation of Sound Absorption Coefficient by Numerical Analysis of an Acoustic Liner with Glazing Flow, JAXA Special Publication: Proceedings of Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2020 Online, JAXA-SP-20-008

Usage of JSS

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: OpenMP
  • Number of Processes: 1 – 144
  • Elapsed Time per Case: 20 Hour(s)

Resources Used(JSS2)

 

Fraction of Usage in Total Resources*1(%): 0.40

 

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

Computational Resources
System Name Amount of Core Time
(core x hours)
Fraction of Usage*2(%)
SORA-MA 972,298.20 0.18
SORA-PP 331,573.43 2.60
SORA-LM 3.73 0.00
SORA-TPP 389,197.57 36.73

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 28.56 0.03
/data 2,002.37 0.04
/ltmp 4,428.52 0.38

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 12.52 0.41

*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.

 

Resources Used(JSS3)

 

Fraction of Usage in Total Resources*1(%): 0.89

 

Details

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

Computational Resources
System Name Amount of Core Time
(core x hours)
Fraction of Usage*2(%)
TOKI-SORA 793,350.37 0.17
TOKI-RURI 384,090.71 2.20
TOKI-TRURI 36,852.00 2.97

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 13.53 0.01
/data 3,537.44 0.06
/ssd 567.22 0.30

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 12.52 0.41

*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.

JAXA Supercomputer System Annual Report April 2020-March 2021