静止時/運動時の凹状物体まわりの超音速流に関する振動特性

第51回流体力学講演会/第37回航空宇宙数値シミュレーション技術シンポジウム (2019年7月1日-3日. 早稲田大学早稲田キャンパス国際会議場), 新宿区, 東京

51st Fluid Dynamics Conference / the 37th Aerospace Numerical Simulation Symposium (July 1-3, 2019. International Conference Center, Waseda University), Shinjuku-ku, Tokyo, Japan

The purpose of the present study is to investigate the basic vibrational characteristics of supersonic flows around a concave body at rest without and with flow perturbations and clarify the relation between vibrational characteristics of flows and self-induced motion of the body. The body motion was computed by use of the moving-coordinate method proposed by the authors, and numerical computations were carried out by using the WENO scheme. As results, due to back pressure the sting introduces disturbance into the flow field, without a sting raised back pressure causes reverse flows to disturb the flow field, and periodically oscillating inflow Mach number makes the detached shock distance vibrate with same period of Mach number. At Mach number 3, in the time histories of lift coefficients, waves with low and high frequencies appear, regardless of a stationary or moving body, and at a stationary body the low frequency appears as low frequency band. The dominant frequencies of lift oscillations at motion overall corresponds to those at rest. In self-induced vibration of the body, the time history of angular velocity has low and high frequencies same as lift oscillations, whereas the time history of angle has only the lower frequency.

形態: カラー図版あり

Physical characteristics: Original contains color illustrations

資料番号: AA1930011020

レポート番号: JAXA-SP-19-007