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REVIEW article

Front. Mech. Eng.
Sec. Fluid Mechanics
Volume 10 - 2024 | doi: 10.3389/fmech.2024.1380675
This article is part of the Research Topic Recent Developments in Aerodynamics View all 9 articles

Review on Flow Separation Control: Effects of Excitation Frequency and Momentum Coefficient

Provisionally accepted
  • Aerospace Research Institute, Tehran, Iran

The final, formatted version of the article will be published soon.

    This paper presents a comprehensive review of the studies and research conducted on flow separation control on lifting surfaces. In this paper, two critical parameters, namely the momentum coefficient and excitation frequency, that significantly impact flow separation control are analyzed in detail. Through a comprehensive literature review, experimental and numerical studies are examined in order to gain insight into the underlying mechanisms of momentum injection and excitation frequency on the shear layer and wake dynamics and to quantify the impact of these parameters on the flow separation control. Effective flow control on lifting surfaces can modify the streamlines and pressure distribution, thereby increasing their aerodynamic efficiency. This paper focuses on the control of flow separation on airfoils, with particular attention paid to the benefits of such control, including lift enhancement, drag reduction, aerodynamic efficiency enhancement, performance enhancement, and other important features. This paper presents a review of studies that have employed blowing actuators, as well as zero net mass flux, plasma, and acoustic actuators, in order to provide an appropriate historical context for recent developments. The findings of this review paper will contribute to a better understanding of the optimal conditions for efficient flow separation control on lifting surfaces using unsteady excitation, which can have significant implications for improving the performance and efficiency of various aerodynamic applications. This paper aims to elucidate and emphasize the positive and negative aspects of existing research, while also suggesting new interesting areas for future investigation.

    Keywords: flow control, Unsteady actuation, Excitation frequency, momentum coefficient, Blowing ratio, Aerodynamic performance, Airfoil, periodic excitation

    Received: 02 Feb 2024; Accepted: 28 Oct 2024.

    Copyright: © 2024 Abdolahipour. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Soheila Abdolahipour, Aerospace Research Institute, Tehran, Iran

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.