Combustion optimization of a port-array inverse diffusion flame jet

L. L. Dong, Chun Shun Cheung, Chun Wah Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)


This paper is an experimental study on the combustion optimization of an Innovative Inverse Diffusion Flame (IDF) characterized by a central air jet surrounded by an array of fuel jets for impingement heating. An extensive investigation has been performed to explore the effects of the diameter ratio between air port and fuel port (dair/dfuel) on the IDF structure, particularly on its thermal and emission characteristics. Small, moderate and large dair/dfuelare investigated. It is found that under the same air flow rate (Q̇air) and dfuel, dairexerts a significant influence on the behavior of the IDF by changing air/fuel hydrodynamics including air/fuel mixing intensity and air entrainment intensity. The experimental results show that smaller dairproduces a blue flame with better thermal characteristics, with higher maximum flame temperature (Tf,max), wider range of air jet Reynolds number (Reair) for flame stability, and wider operation range of the overall equivalence ratio, Φ. On the emission side, smaller dairis found to produce more incomplete combustion products of CO and HC but less NOx, which is attributed to lower volume of high-temperature zone and shorter flame residence time. The current investigation provides a valuable input for combustion and design optimization of this innovative IDF burner for impingement heating.
Original languageEnglish
Pages (from-to)2834-2846
Number of pages13
Issue number5
Publication statusPublished - 1 Jan 2011


  • Combustion emission
  • Flame structure
  • Inverse diffusion flame
  • Port-array burner

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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