Active flow control of secondary flows in turbine nozzle and rotor blades using dielectric barrier discharge plasma actuators

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03868
• 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: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Matsunuma Takayuki 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (40358031)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 空気力学 / プラズマアクチュエータ / ターボ機械 / タービン翼列 / 二次流れ / 流路渦 / 翼先端漏れ渦 / 能動流体制御

Outline of Final Research Achievements

In this study, active flow control using dielectric barrier discharge plasma actuators (PAs) was applied to suppress the secondary flows (passage vortex and tip leakage vortex) generated inside the turbine blades. The velocity field at the outlet of a linear turbine cascade was measured using a particle image velocimetry (PIV) system to investigate the effect of reduction of the passage vortex by driving a PA mounted on the endwall upstream of the blades. In addition, when a gap between the blade tip and the endwall existed, the effect of driving a PA embedded in the endwall faced with the blade tip to suppress the tip leakage vortex was also investigated. When the passage vortex and the tip leakage vortex coexisted, the reduction in only one vortex by the driving the PA resulted in an undesired increase in the other vortex.

Free Research Field

流体工学

Academic Significance and Societal Importance of the Research Achievements

プラズマアクチュエータ（PA）の駆動によりタービン翼列内部の流路渦や翼先端漏れ渦を抑制する風洞実験から，PA設置位置・レイノルズ数（主流速度）・入力電圧・駆動波形（連続駆動とバースト駆動）・設置形状などの各種パラメータの影響を明らかにし，英文ジャーナル５報で発表した。さらに，１つの駆動電源で流路渦と翼先端漏れ渦の両方を同時に抑制できる複合型PAを開発し，特許１件を出願した。これらの研究成果を通して，PAをターボ機械へ応用する研究の発展に貢献した。