Spatio-temporal super-resolution measurement of a supersonic jet using a low-dimensional model and clarification of acoustic wave generation mechanism

2022 Fiscal Year Final Research Report

• Project/Area Number: 19KK0361
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))
• Allocation Type: Multi-year Fund
• Research Field: Aerospace engineering
• Research Institution: Tohoku University
• Principal Investigator: Nonomura Taku 東北大学, 工学研究科, 准教授 (60547967)
• Project Period (FY): 2019 – 2022
• Keywords: データ駆動科学 / 超音速流 / 超時空間解像計測 / 粒子画像速度計測法 / 空力音響

Outline of Final Research Achievements

In collaboration with Prof. Tim Colonius of the California Institute of Technology (Caltech), we developed a spatio-temporal resolution measurement algorithm and applied it to supersonic flow measurements, enabling the estimation of spatiotemporally resolved measurement results of supersonic flows that overcome the limits of conventional measurements. In particular, by using Fourier series expansion to perform hyperspace-resolving measurements, we have succeeded in recovering a three-dimensional velocity field even from a two-dimensional PIV measurement. In addition, we were able to propose a framework for ultra-spatial-resolution measurement that takes into account the dynamics and to recover turbulent structures that are weakly correlated with the microphone.

Free Research Field

航空宇宙工学

Academic Significance and Societal Importance of the Research Achievements

本研究課題では，海外渡航先で共同研究を行うことで，これまで計測できなかった超音速機などがつくる極限流れをデータ駆動科学を利用して，超時空間解像された流れ場を推定する方法を開発した．これまでに計測できなかった極限流れを計測できるようにすることで，先進の航空機や列車，自動車などの輸送機の開発に活きる技術となると考えられる．