scholarly journals Influence of individual roughnesses nozzle edge on the length of the supersonic section of an underexpanded microjet

2019 ◽  
Vol 1404 ◽  
pp. 012087
Author(s):  
S G Mironov ◽  
V M Aniskin
Keyword(s):  
Nozzle Edge

730 Evaluation of Aerodynamic and Acoustic Analysis Procedures for Nozzle-Edge Interaction Flow

2006 ◽  
Vol 2006.55 (0) ◽  
pp. 323-324
Author(s):  
Takanori OZAWA ◽  
Kunihiro YANAGIDA ◽  
Hiroyuki SHIRAISHI
Keyword(s):  
Acoustic Analysis ◽  
Nozzle Edge

scholarly journals Study of the Position of Sound Sources in a Turbulent Jet Using Nozzles of Different Configurations

2020 ◽  
Vol 320 ◽  
pp. 00027
Author(s):  
Victor Ershov ◽  
Igor Khramtsov
Keyword(s):  
Initial Conditions ◽  
Turbulent Jets ◽  
Turbulent Jet ◽  
Small Scale ◽  
Equivalent Diameter ◽  
Frequency Noise ◽  
Noise Sources ◽  
Sound Sources ◽  
Nozzle Edge ◽  
Chevron Nozzles

The aim of this work is to study the position of dominant sound sources in a small-scale turbulent jet using the beamforming method. Two nozzles of equivalent diameter and different geometric configurations (conical and chevron) were used to create different initial conditions for the outflow. Based on the analysis of the results obtained, it can be concluded that they are in good agreement with the well-known concepts of the physics of noise generation processes by turbulent jets: higher-frequency sources are generated by smaller-scale turbulent structures located closer to the nozzle edge, which is confirmed by the localization of high-frequency noise sources also closer to the nozzle edge. The chevron nozzles loosen the initial section of the jet, making it less short and thereby facilitating a faster displacement of noise sources to the nozzle edge, as seen when comparing localization maps for conical and chevron nozzles at the same frequencies. The results of localization were compared with the data obtained by other researchers. The results obtained were found to provide confidence in the use of acoustic beamforming to measure the location of the jet noise source with accuracy similar to other methods that have been used in the past.

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