Open Access

ARTICLE

The Acoustic Performance of 3D Printed Multiple Jet Nozzles with Different Configurations

Ali Safari Variani¹, Ali Dastamoz¹, Sajad Zare², Ahmad Nikpey¹, Saeid Ahmadi^1,*

1 Department of Occupational Health and Safety, School of Public Health, Qazvin University of Medical Sciences, Qazvin, Iran
2 Department of Occupational Health and Safety, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran

* Corresponding Author: Saeid Ahmadi. Email:

Sound & Vibration 2020, 54(1), 43-55. https://doi.org/10.32604/sv.2020.08636

Received 18 September 2019; Accepted 24 December 2019; Issue published 01 March 2020

Abstract

This work investigated multiple jet nozzles with various geometrical shape, number of exits, and material on reducing noise radiated from jet flows. Nozzles are categorized in two groups with few and many exit numbers, each with various exit shapes, slot and circular, and geometry. Firstly, nozzles are designed and then fabricated by a 3D printer, Form Labs, Form2USA, with polymeric resin. Also, the nozzle with the most noise reduction made of stainless steel. Noise and air thrust were measured at three air pressure gauges, 3, 5, 7 BAR and directions from nozzle apex, 30°, 90°, 135°. Nozzles with slot exit shape made of both plastic and stainless steel revealed the most noise reduction among all nozzles with few exit numbers, nearly 11–14 dB(A) and 11.5–15 dB(A), respectively. On average, slotted nozzle noise reduction was nearly 5–6 dB(A) more than finned nozzle. However, nozzles with more exit numbers, finned and finned-central exit, illustrated much more noise reduction than nozzles with few exit numbers, by almost 16–18 dB(A), they represented similar sound. All tested nozzles and open pipe demonstrated equal air thrust at each pressure gauges. The nozzles with slotted exit shape, either plastic or stainless steel, can provide reasonable noise reduction in comparison to other configuration with few exit numbers. In contrast, nozzles with more exit numbers demonstrated the most noise reduction.

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Keywords

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