Publication detail

Schlieren analysis of non-MILD distributed combustion in a mixture temperature-controlled burner

JÓZSA, V. MALÝ, M. FÜZESI, D. RÁCZ, E. KARDOS, R. JEDELSKÝ, J.

Original Title

Schlieren analysis of non-MILD distributed combustion in a mixture temperature-controlled burner

Type

journal article in Web of Science

Language

English

Original Abstract

It was recently demonstrated that distributed combustion is accessible outside the MILD combustion regime without needing inner or outer flue gas recirculation. The Mixture-Temperature Controlled combustion concept, which made it possible, offers excellent flame stability besides ultra-low emission. This concept is investigated presently to reveal the qualitative characteristics of the cold discharging mixture jet from the burner and its ignition. The Schlieren technique with a high-speed camera is the most suitable approach for this purpose, revealing the line-of-sight density gradients. Nine cases were evaluated, utilizing natural gas and diesel fuel, various equivalence ratios, and atomizing pressures. V-shaped flames were used as a baseline for comparing distributed combustion to it via direct images and velocity field using the PIVlab Matlab application. The results confirm the previous hypothesis that distributed combustion features a cold fuel-air mixture at the burner discharge that ignites downstream. The excellent flame stability comes from the fishbone-tiled coherent structures with significant random features, resulting in no characteristic frequency related to the flame. All these results comply with the previous findings by chemiluminescence emission and acoustic signal of distributed combustion, which techniques cannot be used to investigate the flame structure, unlike Schlieren imaging.

Keywords

Turbulent; Burner; Swirl; Combustion; Schlieren; Distributed

Authors

JÓZSA, V.; MALÝ, M.; FÜZESI, D.; RÁCZ, E.; KARDOS, R.; JEDELSKÝ, J.

Released

15. 6. 2023

Publisher

Elsevier

Location

OXFORD

ISBN

0360-5442

Periodical

Energy

Year of study

273

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

12

Pages count

12

URL

https://www.sciencedirect.com/science/article/pii/S0360544223006242

Full text in the Digital Library

http://hdl.handle.net/11012/213602

BibTex

@article{BUT183162,
  author="Viktor {Józsa} and Milan {Malý} and Dániel {Füzesi} and Erika {Rácz} and Réka Anna {Kardos} and Jan {Jedelský}",
  title="Schlieren analysis of non-MILD distributed combustion in a mixture temperature-controlled burner",
  journal="Energy",
  year="2023",
  volume="273",
  number="1",
  pages="1--12",
  doi="10.1016/j.energy.2023.127230",
  issn="0360-5442",
  url="https://www.sciencedirect.com/science/article/pii/S0360544223006242"
}