Study on the performance of high-frequency actuator for controlling high-speed flows

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04198
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Toyota Technological Institute
• Principal Investigator: Taro Handa 豊田工業大学, 工学(系)研究科(研究院), 教授 (30284566)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 流体制御 / 超音速流れ / 遷音速流れ / 境界層制御 / フラッピング噴流 / 流体振動子

Outline of Final Research Achievements

In this study, the device for creating the jet flapping at several tens of kHz is proposed and developed. The performance of the device is evaluated experimentally. It is observed in the experiments that the jet created from the device successfully flaps at several tens of kHz. It is found from the experimental results that the flapping frequency can be controlled by changing the length of the cavity (resonator) in the device keeping the mass flow rate in it constant. The device is applied to control of the supersonic boundary-layer flow. The results reveal that the device is effective for momentum transfer between the primary flow and the flow close to the wall. The device is further developed so as to create a pair of anti-phase-synchronized flapping jets and the synchronization is observed in the experiments.

Free Research Field

流体工学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発したデバイスは航空機の翼および機体周りの流れや超音速旅客機エンジン空気取入口の流れの能動制御に適用できる．本デバイスを用いた能動制御が可能になれば，定常運航時には空力抵抗やエネルギーの損失を招く既存の受動制御用デバイスを使うことなく，必要なときだけ流れを制御できるようになる．本デバイスを用いることで燃料の使用量が少ない高効率の航空機が実現でき，航空機の環境負荷低減につながると考えられる．