JAXA Supercomputer System Annual Report April 2016-March 2017

Report Number: R16E0101

• Responsible Representative: Toshiya Nakamura(Aeronautical Technology Directorate, Next Generation Aeronautical Innovation Hub Center)
• Contact Information: Kazuaki Matsuura(matsuura.kazuaki@jaxa.jp)
• Members: Kazuaki Matsuura, Mitsumasa Makida, Hideshi Yamada, Yoji Kurosawa, Naoki Nakamura, Jun Iino, Huilai Zhang, Shunya Uesaka, Tomoyuki Iwasaki, Ryota Torikai
• Subject Category: Aviation(Aircraft engine)

Abstract

Experimental study of planner filming-type airblast atomizer shows the clear effects of the ambient pressure and the vane angles on atomization characteristics. Since the atomization process occurs in the narrow region which is vicinity of the injection outlet, it is difficult to understand the atomization phenomena only by experiment. The objective of this work is to understand the atomization mechanism by numerical study which calculate the atomization field in the near region of the injection outlet.

Goal

To understand the correlation between important design factors for developing Low NOx emission Nozzle and atomization characteristics, we select a few design factors and have been conducted the experimental study of a basic type (a planner filming-type) airblast atomizer. The experiment shows the clear effect of the ambient pressure and the vane angles on the film structure and the atomization characteristics. The objective of this study is understand the atomization mechanism by numerical analysis with VOF method which can show us the clear view of the atomization field compared to experiment.

Objective

Experimental study of planner filming-type airblast atomizer shows the clear effects of the ambient pressure and the vane angles on atomization characteristics. The target of this study is to understand the mechanism of the effects by numerical analysis with VOF method and to acquire knowledge for constructing CFD technology which can applied to a development of aircraft engine combustor by series of CFD calculations.

References and Links

N/A

Use of the Supercomputer

To conduct the parametric analysis of large scale, complex fuel atomization field in the short term, the super computer is used practically.

Necessity of the Supercomputer

The particle diameter is order of 10μm in the experiment. In order to calculate this size of atomization field precisely, large scale calculation with more than a few of hundred million of cells which size is a few micron meter order is needed and the use of super computer is necessary.

Achievements of the Year

Distribution of the particle diameter is calculated by the VOF method analysis using the two sizes of mesh. In experiment, the particle diameter with lower ambient pressure becomes larger. This tendency, however, has not been observed in this CFD calculation. (Fig.1) We are planning to research and reveal the proper curvature calculation method from the present CFD results. (Fig.2)

Fig.1:Distribution of the particle diameter by the difference in pressure condition and mesh size

Fig.2:Distribution of the curvature estimated on the surface which VOF function is 0.5

Publications

N/A

Computational Information

• Parallelization Methods: Hybrid Parallelization
• Process Parallelization Methods: MPI
• Thread Parallelization Methods: Automatic Parallelization
• Number of Processes: 96
• Number of Threads per Process: 4
• Number of Nodes Used: 12
• Elapsed Time per Case (Hours): 600
• Number of Cases: 6

Resources Used

Total Amount of Virtual Cost(Yen): 14,054,570

Breakdown List by Resources

Note: Virtual Cost=amount of cost, using the unit price list of JAXA Facility Utilization program(2016)

JAXA Supercomputer System Annual Report April 2016-March 2017