nvestigation of the Shock Wave Induced Vorticity Phenomena by Developing the Temperature Measurement Technique Based on the Visualized Data

2022 Fiscal Year Final Research Report

• Project/Area Number: 18K04564
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: Meijo University
• Principal Investigator: Matsuda Atsushi 名城大学, 理工学部, 教授 (80415900)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Keywords: Shock Wave / Discharge Plasma / Vorticity Phenomena

Outline of Final Research Achievements

The vorticity phenomena due to the interaction phenomena between the shock wave and the discharge field is expected to control the supersonic flow field. For the realization of the technique, the comprehension of this phenomena is inevitable. In this study, by acquiring the shock wave visualized data by using the high-speed camera with high time resolution, the shock wave propagation velocity was investigated in detail. The relationship between the shock wave velocity modulation and the the temperature gradient was clarified. Based oh this result, the theory of the temperature measurement based on the shock wave propagation velocity was developed. The validation of the temperature measurement theory was investigated.
Based on this obtained results, it is expected to develop the temperature model around the discharged field and the by the implementation of the model, the numerical investigation is expected for the further comprehension of the phenomena.

Free Research Field

圧縮性流体力学

Academic Significance and Societal Importance of the Research Achievements

本研究では，衝撃波と放電場との干渉による衝撃波渦誘起現象について，低電力での放電場生成が可能な直流グロー放電場に着目し，現象理解に向けた実験及び数値解析を実施した．実験では，高解像度での時間分解可視化画像を取得し，はじめて衝撃波の局所速度変調現象を明らかにした．数値解析により，温度勾配の正負と加速減速現象の相関を明らかにできた．更に，数値解析結果からは，当初予想していなかった，特異的な衝撃波減速現象も明らかになり，そのメカニズムや速度の挙動の理解が今後の可視化ベース温度計測方法の確立に重要な課題となることがわかった．
本研究の成果は，今後の工学応用に向けた重要な布石になると考えられる．