Numerical Simulations of Mixing Enhancement in Subsonic Jet Using High-Momentum Synthetic Jets

2016 ◽  
Vol 32 (5) ◽  
pp. 1095-1103 ◽  
Author(s):  
Qitai Eri ◽  
Liang Hong ◽  
Ting Li ◽  
Qiang Wang ◽  
Mengjie Wang
Keyword(s):  
Numerical Simulations ◽  
Synthetic Jets ◽  
Mixing Enhancement ◽  
High Momentum ◽  
Subsonic Jet

scholarly journals Numerical simulations of synthetic jets in aerodynamic applications

2014 ◽  
Vol 6 (Special 1) ◽  
pp. 81-93 ◽  
Author(s):  
MACOVEI Alexandru Catalin ◽  
◽  
FRUNZULICA Florin
Keyword(s):  
Numerical Simulations ◽  
Synthetic Jets

Mixing Enhancement in Subsonic Jet Flow Using the Air-Tab Technique

AIAA Journal ◽  
2008 ◽  
Vol 46 (11) ◽  
pp. 2966-2969 ◽  
Author(s):  
S. C. M. Yu ◽  
K. S. Lim ◽  
W. Chao ◽  
X. P. Goh
Keyword(s):  
Jet Flow ◽  
Mixing Enhancement ◽  
Subsonic Jet

Numerical Investigation of Controlling Mixing in Coaxial Jets Using Synthetic Jet Actuator Arrays

2008 ◽  
Author(s):  
Yanming Liu ◽  
Baoguo Wang ◽  
Shuyan Liu
Keyword(s):  
Near Field ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Mixing Enhancement ◽  
Mixing Processes ◽  
Turbulent Dissipation ◽  
Synthetic Jet Actuator ◽  
Control Effectiveness ◽  
Coaxial Jets ◽  
Actuator Arrays

A Numerical Simulation has been conducted to investigate the mixing of coaxial jets with zero-mass-flux synthetic jet actuators, two arrays of which are placed side by side around coaxial jets and in the exit plane of the outer primary jet. Both the temperature field of the primary jet and mixing processes are studied at given temperature ratio. High-frequency forcing leads to increases in the radial extent of the jet and turbulent intensity in the near-field and increased turbulent dissipation. During the analysis, the influence of adjacent synthetic jets is also considered. The comparison is made between the control effectiveness of two arrays of actuators and that of an array of actuators. The results show both of the actuator’s configurations can result in the significant mixing enhancement, but the former exhibits more desirable.

LUO-XIA MODEL AND NUMERICAL SIMULATIONS OF DUAL SYNTHETIC JETS

2011 ◽  
pp. 1006-1013
Author(s):  
Z. B. LUO ◽  
Z. X. XIA ◽  
L. WANG ◽  
B. LIU ◽  
Q. H. ZENG
Keyword(s):  
Numerical Simulations ◽  
Synthetic Jets

scholarly journals An Experimental Study of Synthetic Jets From Rectangular Orifices

Volume 4 ◽  
2004 ◽  
Author(s):  
Ivana M. Milanovic ◽  
Khairul B. M. Q. Zaman
Keyword(s):  
Momentum Flux ◽  
Flux Ratio ◽  
Synthetic Jets ◽  
High Momentum ◽  
Cross Sectional ◽  
Velocity Deficit ◽  
Momentum Flux Ratio ◽  
Sectional Plane ◽  
The Cross ◽  
Steady Jets

Results of an experimental investigation on isolated synthetic jets in crossflow from rectangular orifices of different aspect ratio and orientation are presented. Three aspect ratios, AR = 4, 8, and 16, with pitch α = 90°, were investigated. Additionally, the AR = 8 case was pitched at 20°. The yaw angle, β, was varied through 0°, 10°, 45° and 90°. All orifices had same exit area and the data were compared with synthetic as well as steady jet from a circular orifice of same area. Hotwire measurements were performed to obtain all three components of mean velocity and turbulent stresses. Data were acquired for momentum-flux ratio up to J = 50. Distributions of time- and phase-averaged data were obtained on the cross sectional plane at x/D = 0.5, 5 and 10, as well as on the axial plane of the symmetry. Qualitative flowfield similarity between synthetic and steady jets is observed. However, high-momentum ‘cap’ above the low-momentum ‘dome’, characteristic of steady jets, does not necessarily appear in the synthetic jet. The position and shape of the high-momentum region depend on the distance from the orifice, pitch, yaw as well as momentum-flux ratio. Consequently, the location of the minimum velocity in the ‘dome’ measured at the plane of symmetry, ymin, is adopted as a reference for penetration estimate and trajectory comparison. For AR = 16, the dome is the largest in area with maximum velocity deficit. However, the penetration is somewhat higher for AR = 4. Increase in yaw reduces the spatial extent of the dome and the penetration height but augments the velocity deficit. At low J the dome is connected to the boundary layer and traces of the cap of high momentum fluid are visible above it. Increase in J lifts the dome and reorganizes the high-momentum fluid around its perimeter, eventually bringing it underneath. Phase-averaged data document dynamic topological changes within the cycle. Phase-averaged streamwise velocity contours on the cross-sectional plane exhibit behavior commensurate with that seen in time-averaged data at various J.

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