Characterization of Generation Mechanism of Nonlinear Acoustic Waves from Supersonic Jet and Quantitative Prediction of Acoustic Waves

2016 Fiscal Year Final Research Report

• Project/Area Number: 25709009
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Tohoku University (2016); Japan Aerospace EXploration Agency (2013-2015)
• Principal Investigator: Nonomura Taku 東北大学, 工学(系)研究科(研究院), 准教授 (60547967)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 宇宙科学 / 超音速噴流 / 空力音響 / 高解像度数値解析

Outline of Final Research Achievements

What should be resolved in the simulations of supersonic jets for the highly-accurate results is investigated using experiments and high-resolution numerical analysis. In the experiments, acoustic, PIV, and Schlieren photograph measurements are conducted and the connections between flow and acoustic fields structures are clarified. In the numerical analysis, the developed high resolution schemes are employed and the details of the aeroacoustic fields are clarified. These results illustrated that the turbulent acoustic waves can be predicted with the sufficiently high accuracy by resolving the transition behavior with the mesh resolution of eight points inside the initial shear layer for the transitional supersonic jet and by resolving the turbulent behavior of initial disturbed shear layer with the mesh resolution of twenty points inside the initial disturbed shear layer and 512 points for azimuthal direction for the disturbed supersonic jet.

Free Research Field

流体力学