scholarly journals Transverse Acoustic Forcing of Gaseous Hydrogen/Liquid Oxygen Turbulent Shear Coaxial Flames

2020 ◽  
pp. 1-15
Author(s):  
Mario Roa ◽  
Douglas G. Talley
Keyword(s):  
Gaseous Hydrogen ◽  
Liquid Oxygen ◽  
Turbulent Shear ◽  
Transverse Acoustic ◽  
Acoustic Forcing

Unsteady High-Order Simulation of a Liquid Oxygen/Gaseous Hydrogen Rocket Combustor

2015 ◽  
Vol 31 (6) ◽  
pp. 1715-1726 ◽  
Author(s):  
Markus Lempke ◽  
Peter Gerlinger ◽  
Martin J. Seidl ◽  
Manfred Aigner
Keyword(s):  
High Order ◽  
Gaseous Hydrogen ◽  
Liquid Oxygen

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.

Propellant Atomization and Ignition Phenomena in Liquid Oxygen/Gaseous Hydrogen Rocket Combustors

2001 ◽  
Vol 17 (4) ◽  
pp. 794-799 ◽  
Author(s):  
Wolfgang O. H. Mayer ◽  
Blazenko Ivancic ◽  
Axel Schik ◽  
Ulf Hornung
Keyword(s):  
Gaseous Hydrogen ◽  
Liquid Oxygen

Injection and Mixing Processes in High-Pressure Liquid Oxygen/Gaseous Hydrogen Rocket Combustors

2000 ◽  
Vol 16 (5) ◽  
pp. 823-828 ◽  
Author(s):  
W. Mayer ◽  
A. Schik ◽  
M. Schaffler ◽  
H. Tamura
Keyword(s):  
High Pressure ◽  
Gaseous Hydrogen ◽  
Liquid Oxygen ◽  
Mixing Processes
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