Investigation of fluid-structure-thermal interaction induced by pulse power input

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04087
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Inaba Kazuaki 東京工業大学, 環境・社会理工学院, 准教授 (00408725)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 流体構造連成 / キャビテーション壊食 / サーマルストライピング

Outline of Final Research Achievements

Aiming at the examination of the coupled phenomenon of wave propagation from fluid to solid or solid to fluid, we conducted research to build the theory of wave propagation phenomenon at the solid-liquid coupled interface by changing the surface state and type of solid. We predicted the direction of jet formation when bubbles collapse near the solid surface and found that the impact load vibrates due to the natural frequency of the bubbles. In addition, based on the theory of thin and thick plates in air, we constructed a theory to predict the vibration characteristics of plates in contact with fluid, and derived theoretical formulas for transient response and impact force estimation. Furthermore, the theoretical formula of the free vibration of the functionally graded material pipe was derived, and the effect on fatigue was evaluated for the thermal-fluid-structural coupling problem by comparing with numerical simulations.

Free Research Field

機械工学，材料力学，流体力学，計算工学

Academic Significance and Societal Importance of the Research Achievements

固体中の応力は，３次元的なベクトル成分を持ち，流体中の圧力は静水圧成分としてのスカラー量として定義される．本研究では，このような二つの媒体を伝播する波動が固液連成界面をどのように伝わり，また界面で入射・反射が生じるかに着目して研究を実施したものである．このような状況は，流体中でキャビテーション気泡が生成・崩壊した場合や，爆発などが生じて衝撃波や圧力波が伝播する際に観察される．発電所やプラントの配管系で生じるほか，流体ポンプや自動車の燃料噴射，ブレーキシステムなどでも問題となることから，社会の幅広い分野での工業的応用が可能となる研究である．