scholarly journals Development of a free round jet at different conditions at the nozzle exit under an acoustic action

2012 ◽  
Author(s):  
Yu. A. Litvinenko ◽  
G. R. Grek ◽  
G. V. Kozlov ◽  
A. M. Sorokin ◽  
M. V. Litvinenko
Keyword(s):  
Nozzle Exit ◽  
Acoustic Action ◽  
Round Jet

Influence of initial conditions at the nozzle exit on the structure of round jet

2008 ◽  
Vol 15 (1) ◽  
pp. 55-68 ◽  
Author(s):  
G. V. Kozlov ◽  
G. R. Grek ◽  
A. M. Sorokin ◽  
Yu. A. Litvinenko
Keyword(s):  
Nozzle Exit ◽  
Initial Conditions ◽  
Round Jet

EFFECTS OF NOZZLE EXIT GEOMETRY ON SPRAY CHARACTERISTICS OF A BLURRY INJECTOR

2013 ◽  
Vol 23 (3) ◽  
pp. 193-209 ◽  
Author(s):  
Claudia Goncalves Azevedo ◽  
Jose Carlos de Andrade ◽  
Fernando de Souza Costa
Keyword(s):  
Nozzle Exit ◽  
Spray Characteristics

ROUND JET IN CROSS SHEAR FLOW

2012 ◽  
Vol 2 (4) ◽  
Author(s):  
Genrich R. Grek ◽  
Grigory V. Kozlov ◽  
Victor V. Kozlov ◽  
Yury A. Litvinenko ◽  
Maria V. Litvinenko
Keyword(s):  
Shear Flow ◽  
Round Jet

Disorganization of a hole tone feedback loop by an axisymmetric obstacle on a downstream end plate

2014 ◽  
Vol 757 ◽  
pp. 908-942 ◽  
Author(s):  
K. Matsuura ◽  
M. Nakano
Keyword(s):  
Nozzle Exit ◽  
Passive Control ◽  
Control Method ◽  
Three Dimensional ◽  
Acoustic Power ◽  
Shear Layers ◽  
Mean Velocity ◽  
End Plate ◽  
Air Jet ◽  
Practical Engineering

AbstractThis study investigates the suppression of the sound produced when a jet, issued from a circular nozzle or hole in a plate, goes through a similar hole in a second plate. The sound, known as a hole tone, is encountered in many practical engineering situations. The mean velocity of the air jet $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}u_0$ was $6\text {--}12\ \mathrm{m}\ {\mathrm{s}}^{-1}$. The nozzle and the end plate hole both had a diameter of 51 mm, and the impingement length $L_{im}$ between the nozzle and the end plate was 50–90 mm. We propose a novel passive control method of suppressing the tone with an axisymmetric obstacle on the end plate. We find that the effect of the obstacle is well described by the combination ($W/L_{im}$, $h$) where $W$ is the distance from the edge of the end plate hole to the inner wall of the obstacle, and $h$ is the obstacle height. The tone is suppressed when backflows from the obstacle affect the jet shear layers near the nozzle exit. We do a direct sound computation for a typical case where the tone is successfully suppressed. Axisymmetric uniformity observed in the uncontrolled case is broken almost completely in the controlled case. The destruction is maintained by the process in which three-dimensional vortices in the jet shear layers convect downstream, interact with the obstacle and recursively disturb the jet flow from the nozzle exit. While regions near the edge of the end plate hole are responsible for producing the sound in the controlled case as well as in the uncontrolled case, acoustic power in the controlled case is much lower than in the uncontrolled case because of the disorganized state.

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