Publication detail

Importance of Geometrical Factors on Spray Characteristics of Spill-return Atomisers

JEDELSKÝ, J. MALÝ, M. JÍCHA, M. SLÁMA, J. WIGLEY, G.

Original Title

Importance of Geometrical Factors on Spray Characteristics of Spill-return Atomisers

Type

journal article in Web of Science

Language

English

Original Abstract

An experimental investigation into small pressure-swirl spill-return atomizers was made to determine the effect of the entry port number, swirl chamber shape, spill-line design and the manufacturing precision on the spray quality and stability. The atomizers were experimentally studied using phase-Doppler anemometry, high-speed visualization and mechanical patternation. The Jet A-1 fuel was sprayed at inlet pressures of 0.5, 1.0 and 1.5 MPa and for spill-to-feed ratios of 0, 0.4 and 0.8. The chamber shape influenced the spray characteristics of the simplex atomizers only moderately with no systematic effect of conical chambers to the others. The spray was found to be circumferentially heterogeneous; its uniformity improved with increase in the pressure while the effect of swirling port number was negligible. Atomizers with axial spill orifice demonstrated strong spray pulsations at a spill-to-feed ratio of zero. A periodic decay of the air core was identified as a possible reason for the pulsations. Atomizers with the off-axis spill orifices always produced a stable spray. The atomizers with tangential inlet ports provided a finer spray than those with the helical ports. The manufacturing precision, axial symmetry and matching of the surfaces of connected parts were found important for the spray symmetry and homogeneity.

Keywords

Pressure-swirl atomizer; Spill-line orifice; Air core stability; Spray quality; Atomizer design; Manufacturing precision

Authors

JEDELSKÝ, J.; MALÝ, M.; JÍCHA, M.; SLÁMA, J.; WIGLEY, G.

Released

1. 5. 2021

Publisher

American Institute of Aeronautics and Astronautics

Location

12700 Sunrise Valley Drive, Suite 200, Reston, VA 20191-5807

ISBN

1533-3876

Periodical

Journal of Propulsion and Power

Year of study

37

Number

3

State

United States of America

Pages from

408

Pages to

418

Pages count

11

URL

https://arc.aiaa.org/doi/full/10.2514/1.B38066

BibTex

@article{BUT168035,
  author="Jan {Jedelský} and Milan {Malý} and Miroslav {Jícha} and Jaroslav {Sláma} and Graham {Wigley}",
  title="Importance of Geometrical Factors on Spray Characteristics of Spill-return Atomisers",
  journal="Journal of Propulsion and Power",
  year="2021",
  volume="37",
  number="3",
  pages="408--418",
  doi="10.2514/1.B38066",
  issn="1533-3876",
  url="https://arc.aiaa.org/doi/full/10.2514/1.B38066"
}