Flame downwash transition and its maximum length with increasing fuel supply of non-premixed jet in cross flow

Xin Li, Longhua Hu and Fengju Shang

Energy, 2018, vol. 164, issue C, 298-305

Abstract: The present study experimentally investigated the flame downwash transition and its maximum length that can be reached at leeward side of nozzle with increasing fuel supply of non-premixed jet in cross flows. Experiments were conducted with 8, 10, 13 and 15 mm nozzles, using propane and methane as fuel. The cross flow speed ranges from 0.70 to 3.08 m/s while the fuel jet velocity ranges between 0.04 and 4.26 m/s. Results showed that, with increasing fuel supply at a given cross flow speed, flame downwash length first increased (fuel supply controlled regime) then decreased (leeward side reversing flow rotating strength controlled regime). A function between the jet-to-crossflow momentum flux ratio (Rc) and dimensionless fuel mass flow rate (m˙c∗) was proposed to illuminate the tuning state of above transition. The flame downwash maximum length at the turning state normalized by nozzle diameter was found to have a linear relation with Froude number of fuel jet (Frj=uj/gD) or cross flow (Fra=ua2/gD). These findings contribute to a better understanding of flame downwash evolution process, which could have a basic significance for reducing fuel emission, improving combustion energy efficiency and saving energy by controlling the flame downwash scale.

Keywords: Flame downwash; Non-premixed jet; Cross flow; Flame downwash maximum length; Jet-to-crossflow momentum flux ratio (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544218316670
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:164:y:2018:i:c:p:298-305

DOI: 10.1016/j.energy.2018.08.133

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().