Closure to “Discussions of ‘Increased Turbulent Jet Mixing Rates Obtained by Self-Excited Acoustic Oscillations’” (1977, ASME J. Fluids Eng., 99, pp. 788–789)

1977 ◽  
Vol 99 (4) ◽  
pp. 789-789
Author(s):  
W. G. Hill ◽  
P. R. Greene
Keyword(s):  
Turbulent Jet ◽  
Acoustic Oscillations ◽  
Jet Mixing ◽  
Mixing Rates

Increased Turbulent Jet Mixing Rates Obtained by Self-Excited Acoustic Oscillations

1977 ◽  
Vol 99 (3) ◽  
pp. 520-525 ◽  
Author(s):  
W. G. Hill ◽  
P. R. Greene
Keyword(s):  
Large Scale ◽  
Exit Section ◽  
Acoustic Oscillations ◽  
Convergent Nozzle ◽  
Jet Mixing ◽  
New Device ◽  
Constant Area ◽  
Wide Range ◽  
Mixing Rates ◽  
Area Section

A new device, capable of greatly increasing subsonic jet mixing rates, has been discovered. This device, which we have named the “whistler nozzle,” consists of a convergent nozzle section, a constant area section, and a step change to an exit section with a larger constant area. The exit section excites a standing acoustic wave in the constant area section, in a way similar to the action of an organ pipe. The result of this resonance is a loud pure tone and a greatly increased rate of jet mixing. The increased mixing rates appear related to the acoustically stimulated vortex shedding character (large scale structure or superturbulence) observed by Crow and Champagne [1] in their pioneering study of jets excited by a loudspeaker, and others utilizing upstream valves and pistons, except that the whistler nozzle is self-excited. The standing wave and the resulting increased mixing rates occur for a wide range of exit plane configurations and jet parameters.

Simultaneous Velocity and Concentration Measurements of a Turbulent Jet Mixing Flow

2002 ◽  
Vol 972 (1) ◽  
pp. 254-259 ◽  
Author(s):  
HUI HU ◽  
TETSUO SAGA ◽  
TOSHIO KOBAYASHI ◽  
NOBUYUKI TANIGUCHI
Keyword(s):  
Turbulent Jet ◽  
Jet Mixing ◽  
Concentration Measurements

Non-isoenergetic Turbulent Jet Mixing in a Constant-Area Duct

AIAA Journal ◽  
1982 ◽  
Vol 20 (4) ◽  
pp. 488-495
Author(s):  
W. Tabakoff ◽  
J. H. Blasenak
Keyword(s):  
Turbulent Jet ◽  
Jet Mixing ◽  
Constant Area

Optimization of turbulent jet mixing

2001 ◽  
Vol 29 (6) ◽  
pp. 345-368 ◽  
Author(s):  
A Hilgers ◽  
B J Boersma
Keyword(s):  
Turbulent Jet ◽  
Jet Mixing

Images of the two-dimensional field and temperature gradients to quantify mixing rates within a non-premixed turbulent jet flame

1995 ◽  
Vol 101 (1-2) ◽  
pp. 58-68 ◽  
Author(s):  
David A. Everest ◽  
James F. Driscoll ◽  
Werner J.A. Dahm ◽  
Douglas A. Feikema
Keyword(s):  
Temperature Gradients ◽  
Turbulent Jet ◽  
Two Dimensional ◽  
Jet Flame ◽  
Mixing Rates

Viscid-Inviscid Interaction of Incompressible Separated Flows

1976 ◽  
Vol 43 (3) ◽  
pp. 387-395 ◽  
Author(s):  
W. L. Chow ◽  
D. J. Spring
Keyword(s):  
Viscous Flow ◽  
Pressure Coefficient ◽  
Separated Flow ◽  
Inviscid Flow ◽  
Turbulent Jet ◽  
Tunnel Wall ◽  
Flow Process ◽  
Jet Mixing ◽  
Flow Problems ◽  
Flow Components

A flow model has been devised to deal with the viscid-inviscid interaction of a class of two-dimensional incompressible separated flow problems. It is suggested that the corresponding inviscid flow of these problems is described by the free streamline theory with few unspecified parameters and their values are, in turn, determined by the viscous flow considerations. The problem of a flow past a backward facing step is selected for study in detail. The viscous flow components of turbulent jet mixing, recompression, and reattachment are delineated and studied individually. When they are later combined, it is found that the point of reattachment behaves as a saddle-point-type singularity in the system of differential equations describing the viscous flow process. This feature is employed to the determination of the aforementioned free parameters and thus the establishment of the overall corresponding inviscid flow field. The resulting base pressure coefficient for the specific case agrees reasonably well with the available experimental data. Additional calculations are performed to demonstrate the influence of higher Reynolds numbers and the values of the similarity (or spread rate) parameter σ of the “constant pressure” turbulent jet mixing process. Further studies of redevelopment of the viscous flow after reattachment, the turbulent exchange within the recompression and redevelopment regions, and the effect of wind tunnel-wall interference on the overall flow patterns have been suggested and discussed.

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