scholarly journals Three-dimensional numerical simulations of synthetic jet actuator flows in a microchannel

2004 ◽  
Author(s):  
S. G. Mallinson ◽  
G. Johnson ◽  
M. Gaston ◽  
Guang Hong
Keyword(s):  
Numerical Simulations ◽  
Three Dimensional ◽  
Synthetic Jet ◽  
Synthetic Jet Actuator

scholarly journals Measurements versus Numerical Simulations for Slotted Synthetic Jet Actuator

Actuators ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 59 ◽  
Author(s):  
Andrea Palumbo ◽  
Matteo Chiatto ◽  
Luigi de Luca
Keyword(s):  
Numerical Simulations ◽  
Vortex Motion ◽  
External Environment ◽  
Streamwise Velocity ◽  
Synthetic Jet ◽  
Spanwise Direction ◽  
Exit Plane ◽  
Specific Flow ◽  
Synthetic Jet Actuator ◽  
Dimensional Parameters

In many studies concerning synthetic jet flow fields the analysis is usually restricted to simple configurations, such as a single diaphragm oscillating in a cylindrical cavity, which is linked to the external environment with only one orifice/slot. Nonetheless, in many applications the requirement of small sizes and weights leads to many implementation issues, such as asymmetric actuator geometries, presence of several slots and diaphragms and irregular cavity shapes. Therefore, the design of a synthetic jet actuator for a specific flow control problem requires a dedicated study in order to characterize its behavior even in quiescent conditions. The aim of this work is to investigate the behavior of a novel synthetic jet actuator, composed of three independent diaphragms, acting on a single cavity, and linked to the external environment through four slots per diaphragm. The device has been studied in quiescent conditions, both numerically and experimentally. The experimental investigation has been carried out by means of hot-wire measurements. In particular, the distribution of the phase-averaged streamwise velocity along the slot spanwise direction has been detected near the slot exit plane. From the computational side, incompressible direct numerical simulations have been carried out using the open-source OpenFOAM code. The diaphragm motion is mimicked by a inhomogeneous inlet boundary condition, whose amplitude is chosen to match the experimental velocity at the exit plane. A fair agreement between the numerical and the experimental results is achieved for both the velocity field at the slot exit and the main non-dimensional parameters of the synthetic jet. After the validation, the numerical results are finally processed, to obtain information about the vortex motion in the external environment.

Numerical Simulation of Synthetic Jet Actuator and its Controlling Effect on the S-Inlet

2013 ◽  
Vol 455 ◽  
pp. 383-388
Author(s):  
Yan Qing Hu ◽  
Nai Ming Wu ◽  
He Liu
Keyword(s):  
Numerical Simulation ◽  
Total Pressure ◽  
Three Dimensional ◽  
Internal Flow ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Recovery Coefficient ◽  
Synthetic Jet Actuator ◽  
Total Pressure Recovery ◽  
Pressure Recovery Coefficient

This paper presents a study of the tandem piston synthetic jet and its effect to the internal flow fields of the S-induct excited by the actuator using numerical simulation. The three-dimensional unsteady Reynolds averaged N-S equations and second order upwind scheme are employed. Structure grids are used for the computational model. Firstly, we numerically simulate the synthetic jet characterized by blowing and suction simultaneously and analyze its synthetic jet performance. Secondly, we apply this synthetic jets actuator to the S-induct, finding that the synthetic jets actuator makes a great effect to the S-induct. Results show that the secondary flow becomes weak, besides, S-induct total pressure recovery coefficient of the exit has improved at some extent.

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