Abstract
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.
Highlights
The formulation and methods of solving modern problems to reduce the negative impact of air transport on the environment and humanity are initiated by the International Civil Aviation Organization (ICAO)
This paper considers the acoustic characteristics of jets emanating from a conical and chevron nozzle
Metal chevron nozzles are used with equivalent dimensions corresponding to a conical nozzle with an outlet diameter of 50 mm
Summary
The formulation and methods of solving modern problems to reduce the negative impact of air transport on the environment and humanity are initiated by the International Civil Aviation Organization (ICAO). Passive control is carried out by changing the flow conditions or changing the geometry of the jet-forming device In this case, mixing is mainly intensified, which changes the properties of large-scale vortex structures and reduces the length of the initial section of the jet. These methods include slit (rectangular), chevron, beveled and corrugated nozzles [2, 13,14,15,16,17,18]. Chevron nozzles are most often used to reduce the jet noise of real aircraft engines This form is the most common, since it combines ease of manufacture and a fairly high efficiency (up to 3-5 dB). The method of beamforming has proven itself well for localizing isolated point sound sources [24]
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