Dark Core Analysis of Coaxial Injectors at Sub-, Near-, and Supercritical Conditions in a Transverse Acoustic Field

2007 ◽  
Author(s):  
Ivett Leyva ◽  
Bruce Chehroudi ◽  
Douglas Talley
Keyword(s):  
Acoustic Field ◽  
Core Analysis ◽  
Supercritical Conditions ◽  
Transverse Acoustic ◽  
Dark Core

Atomization of acoustically forced liquid sheets

2019 ◽  
Vol 880 ◽  
pp. 653-683 ◽  
Author(s):  
Sandip Dighe ◽  
Hrishikesh Gadgil
Keyword(s):  
Acoustic Field ◽  
Cutoff Frequency ◽  
Liquid Sheet ◽  
Liquid Jets ◽  
Liquid Sheets ◽  
Aerodynamic Interaction ◽  
Transverse Acoustic ◽  
External Acoustic Field ◽  
Acoustic Forcing ◽  
Sheet Breakup

Atomization of a smooth laminar liquid sheet produced by the oblique impingement of two liquid jets and subjected to transverse acoustic forcing in quiescent ambient is investigated. The acoustic forcing perturbs the liquid sheet perpendicular to its plane, thereby setting up a train of sinuous waves propagating radially outwards from the impingement point. These sheet undulations grow as the wave speed decreases towards the edge of the sheet and the sheet characteristics, like intact length and mean drop size, reduce drastically as compared to the natural breakup. Our observations show that the effect of the acoustic field is perceptible over a continuous range of forcing frequencies. Beyond a certain forcing frequency, called the cutoff frequency, the effect of the external acoustic field ceases. The cutoff frequency is found to be an increasing function of the Weber number. Our measurements of the characteristics of spatially amplifying sinuous waves show that the instabilities responsible for the natural sheet breakup augment in the presence of external forcing. Combining the experimental observations and measurements, we conclude that the linear theory of aerodynamic interaction (Squire’s theory) (Squire, Brit. J. Appl. Phys., vol. 4 (6), 1953, pp. 167–169) predicts the important features of this phenomenon reasonably well.

Responses of V-flames placed in an HF transverse acoustic field from a velocity to pressure antinode

2013 ◽  
Vol 341 (1-2) ◽  
pp. 110-120 ◽  
Author(s):  
Florian Lespinasse ◽  
Françoise Baillot ◽  
Toufik Boushaki
Keyword(s):  
Acoustic Field ◽  
Transverse Acoustic

Subsonic Round and Plane Macro∕Micro-jets in a Transverse Acoustic Field

2011 ◽  
Author(s):  
V. V. Kozlov ◽  
G. R. Grek ◽  
Yu. A. Litvinenko ◽  
G. V. Kozlov ◽  
Jiachun Li ◽  
...  
Keyword(s):  
Acoustic Field ◽  
Transverse Acoustic

Round and plane jets in a transverse acoustic field

2011 ◽  
Vol 20 (3) ◽  
pp. 272-289 ◽  
Author(s):  
V. V. Kozlov ◽  
G. R. Grek ◽  
Yu. A. Litvinenko ◽  
G. V. Kozlov ◽  
M. V. Litvinenko
Keyword(s):  
Acoustic Field ◽  
Transverse Acoustic ◽  
Plane Jets

The Features of Hydrogen Combustion in Round and Plane Microjet in the Transverse Acoustic Field, and Comparison with the Results Propane Combustion

2014 ◽  
Vol 9 (1) ◽  
pp. 79-86
Author(s):  
Viktor Kozlov ◽  
Genrich Grek ◽  
Oleg Korobeinichev ◽  
Yuriy Litvinenko ◽  
Andrey Shmakov
Keyword(s):  
Acoustic Field ◽  
Experimental Studies ◽  
Reynolds Numbers ◽  
Hydrogen Combustion ◽  
Diffusion Combustion ◽  
Propane Combustion ◽  
Experimental Conditions ◽  
Transverse Acoustic ◽  
Plane Jets ◽  
Oscillation Process

Experimental studies of the hydrogen combustion in the round and plane microjet in cross acoustic field at low Reynolds numbers are presented. The results are compared with the results obtained during the combustion of propane, studied earlier in the same experimental conditions. It is shown that the lifted flame of propane at diffusion combustion in a round microjet, under the influence of a transverse acoustic field, subject to bifurcation. This phenomenon is associated with the development of a sinusoidal oscillation process occurring under the influence of a transverse acoustic field. For the case of hydrogen combustion of plane microjet to lift the flame also failed, but the bifurcation effect is manifested at velocity close to 450 m/s. In this case acoustic disturbances generated by the jet, and a sinusoidal instability is typical for the plane jets

The flame structure in round and plane propane microjet combustion in a transverse acoustic field at low Reynolds numbers

2014 ◽  
Vol 59 (12) ◽  
pp. 596-600 ◽  
Author(s):  
V. V. Kozlov ◽  
G. R. Grek ◽  
M. M. Katasonov ◽  
O. P. Korobeinichev ◽  
Yu. A. Litvinenko ◽  
...  
Keyword(s):  
Acoustic Field ◽  
Flame Structure ◽  
Reynolds Numbers ◽  
Low Reynolds Numbers ◽  
Transverse Acoustic ◽  
Low Reynolds
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