Experimental and Numerical Studies of Active Flow Control Technique for the Reduction of Helicopter BVI Noise

2011 ◽  
Author(s):  
Carlos Velez ◽  
Patricia Coronado ◽  
Husam Al-Kuran ◽  
Amanda DePerta ◽  
Marcel Ilie
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Control Technique ◽  
Numerical Studies ◽  
Active Flow

Conceptual design and numerical studies of active flow control aerofoil based on shape-memory alloy and macro fibre composites

2021 ◽  
Vol 125 (1287) ◽  
pp. 830-846
Author(s):  
W. Zhang ◽  
X.T. Nie ◽  
X.Y. Gao ◽  
W.H. Chen
Keyword(s):  
Shape Memory Alloy ◽  
Flow Control ◽  
Shape Memory ◽  
Vibration Frequency ◽  
Active Flow Control ◽  
Flow Characteristics ◽  
Hybrid Design ◽  
Numerical Studies ◽  
Fibre Composites ◽  
Active Flow

ABSTRACTActive flow control for aerofoils has been proven to be an effective way to improve the aerodynamic performance of aircraft. A conceptual hybrid design with surfaces embedded with Shape-Memory Alloy (SMA) and trailing Macro Fibre Composites (MFC) is proposed to implement active flow control for aerofoils. A Computational Fluid Dynamics (CFD) model has been built to explore the feasibility and potential performance of the proposed conceptual hybrid design. Accordingly, numerical analysis is carried out to investigate the unsteady flow characteristics by dynamic morphing rather than using classical static simulations and complicated coupling. The results show that camber growth by SMA action could cause an evident rise of Cl and Cd in the take-off/landing phases when the Angle-of-Attack (AoA) is less than 10°. The transient tail vibration behaviour in the cruise period when using MFC actuators is studied over wide ranges of frequency, AoA and vibration amplitude. The buffet frequency is locked in by the vibration frequency, and a decrease of 1.66–2.32% in Cd can be achieved by using a proper vibration frequency and amplitude.

Simple frigate shape plasma flow control

2016 ◽  
Vol 230 (14) ◽  
pp. 2693-2699 ◽  
Author(s):  
R Bardera-Mora ◽  
A Conesa ◽  
I Lozano
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Plasma Actuators ◽  
Control Technique ◽  
Shape Model ◽  
Image Velocimetry ◽  
Barrier Discharge Plasma ◽  
Plasma Flow Control ◽  
Active Flow ◽  
Low Speed Wind Tunnel

This experimental investigation presents a new active flow control technique based on plasma actuators applied to a backward facing step whose structure is similar to that formed by the hangar and flight deck of small naval vessels. These experiments were carried out by testing a simple frigate shape model settled at 0° wind over deck in a low-speed wind tunnel. Two different configurations of dielectric barrier discharge plasma actuator have been used to modify the flow downstream of the step. Results obtained investigating the flow by particle image velocimetry prove the capacity of plasma actuators by reducing instabilities and turbulence over the simple frigate shape model.

Correction: Towards Efficient 2-DOF LCO Control Using a Closed-loop Nonlinear Active Flow Control Technique

2020 ◽  
Author(s):  
William MacKunis ◽  
Vladimir V. Golubev ◽  
Krishna Bhavithavya B. Kidambi ◽  
Reda R. Mankbadi ◽  
Oksana Stalnov
Keyword(s):  
Flow Control ◽  
Closed Loop ◽  
Active Flow Control ◽  
Control Technique ◽  
Active Flow

scholarly journals Application of Active Flow Control Technique for Gust Load Alleviation

2011 ◽  
Vol 24 (4) ◽  
pp. 410-416 ◽  
Author(s):  
Xiaoping XU ◽  
Xiaoping ZHU ◽  
Zhou ZHOU ◽  
Ruijun FAN
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Control Technique ◽  
Gust Load Alleviation ◽  
Active Flow

scholarly journals Development of an Active Flow Control Technique for an Airplane High-Lift Configuration

2017 ◽  
Author(s):  
Arvin Shmilovich ◽  
Yoram Yadlin ◽  
Eric D. Dickey ◽  
Peter M. Hartwich ◽  
Abdi Khodadoust
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Control Technique ◽  
High Lift ◽  
Active Flow

scholarly journals Active Flow Control in a Radial Vaned Diffuser for Surge Margin Improvement: A Multislot Suction Strategy

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Aurélien Marsan ◽  
Isabelle Trébinjac ◽  
Stéphane Moreau ◽  
Sylvain Coste
Keyword(s):  
Boundary Layer ◽  
Flow Control ◽  
Active Flow Control ◽  
Control Technique ◽  
Navier Stokes ◽  
Compressor Stage ◽  
Vaned Diffuser ◽  
Boundary Layer Suction ◽  
Surge Margin ◽  
Active Flow

This work is the final step of a research project that aims at evaluating the possibility of delaying the surge of a centrifugal compressor stage using a boundary-layer suction technique. It is based on Reynolds-Averaged Navier-Stokes numerical simulations. Boundary-layer suction is applied within the radial vaned diffuser. Previous work has shown the necessity to take into account the unsteady behavior of the flow when designing the active flow control technique. In this paper, a multislot strategy is designed according to the characteristics of the unsteady pressure field. Its implementation results in a significant increase of the stable operating range predicted by the unsteady RANS numerical model. A hub-corner separation still exists further downstream in the diffuser passage but does not compromise the stability of the compressor stage.

Towards Efficient 2-DOF LCO Control Using a Closed-loop Nonlinear Active Flow Control Technique

2020 ◽  
Author(s):  
William MacKunis ◽  
Vladimir V. Golubev ◽  
Krishna Bhavithavya B. Kidambi ◽  
Reda R. Mankbadi ◽  
Oksana Stalnov
Keyword(s):  
Flow Control ◽  
Closed Loop ◽  
Active Flow Control ◽  
Control Technique ◽  
Active Flow
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