Publication detail

Effect of Fabrication Method and Surface Roughness on Spray Characteristics for Small Pressure-Swirl Atomizers

JEDELSKÝ, J. MALÝ, M. BĚLKA, M. POLZER, A. SÁMELOVÁ, V. CEJPEK, O. WIGLEY, G.

Original Title

Effect of Fabrication Method and Surface Roughness on Spray Characteristics for Small Pressure-Swirl Atomizers

Type

journal article in Web of Science

Language

English

Original Abstract

The paper investigates the effect of the fabrication method, precision and surface roughness on atomization nozzle performance. A comprehensive review of the available knowledge on the topic is an integral part and an indispensable prerequisite of the study. It focuses on the requirements for atomizing nozzles and their production from the point of view of surface quality, dimensional and shape accuracy. The published results on the influence of surface quality and roughness on internal flow and atomizer performance are discussed. Available atomizer manufacturing techniques are reviewed with a focus on Rapid prototyping methods, accuracy and geometrical imperfections. Classical Machining and two 3D printing techniques were applied to produce small pressure-swirl atomizers. They were fabricated in a number of versions. The machined nozzles featured several specific defects. Spray quality measurements of these atomizers, at selected operation regimes, were made on a cold test bench using PDA and mechanical patternation to evaluate discharge coefficient (CD), Sauter mean diameter, spray cone angle, nozzle efficiency (eta n), breakup length and liquid distribution in the spray. The results show the important and systematic effects of surface quality and manufacturing imperfections on the atomizer characteristics. The exit orifice imperfections harm the circumferential uniformity and other spray characteristics. The effect becomes significant when the exit orifice shifted out of the nozzle axis by >2 % of the chamber diameter, and the orifice edge is chamfered by >20 % of the orifice length. The swirl chamber surface modified by scratches has a minor effect. Replacement of machining with current commercial 3D printing techniques, namely Selective laser melting and PolyJet technique, is associated with increased surface roughness. It worsens spray quality, liquid distri-bution uniformity and eta n and increases the CD when relative surface roughness exceeds 0.007. The result presentation using dimensionless criteria allows for generalisation of the outcomes to other atomizer types and scales.

Keywords

Pressure-swirl atomizer;Spray quality;Manufacturing precision;Fabrication method;Surface quality;Additive manufacturing

Authors

JEDELSKÝ, J.; MALÝ, M.; BĚLKA, M.; POLZER, A.; SÁMELOVÁ, V.; CEJPEK, O.; WIGLEY, G.

Released

6. 1. 2023

Publisher

Elsevier

Location

Amsterdam

ISBN

2212-4616

Periodical

Journal of Manufacturing Processes

Year of study

85

Number

1

State

United States of America

Pages from

166

Pages to

178

Pages count

13

URL

https://www.sciencedirect.com/science/article/pii/S1526612522008076?via%3Dihub

Full text in the Digital Library

http://hdl.handle.net/11012/244294

BibTex

@article{BUT180671,
  author="Jan {Jedelský} and Milan {Malý} and Miloslav {Bělka} and Aleš {Polzer} and Vendula {Sámelová} and Ondřej {Cejpek} and Graham {Wigley}",
  title="Effect of Fabrication Method and Surface Roughness on Spray Characteristics for Small Pressure-Swirl Atomizers",
  journal="Journal of Manufacturing Processes",
  year="2023",
  volume="85",
  number="1",
  pages="166--178",
  doi="10.1016/j.jmapro.2022.11.031",
  issn="2212-4616",
  url="https://www.sciencedirect.com/science/article/pii/S1526612522008076?via%3Dihub"
}