Effects of Burned Gas Dilution on the Ignition Delay Time of High Temperature Air Combustion with a Parallel Jet Burner

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  • NADA Yuzuru
    Department of Energy System, The University of Tokushima
  • 伊藤 高啓
    豊橋技術科学大学大学院工学研究科機械工学系
  • 野田 進
    豊橋技術科学大学大学院工学研究科機械工学系

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Other Title
  • 平行噴流バーナーを用いた高温空気燃焼の着火遅れに対する既燃ガス希釈の影響

Description

Objectives of this study are to suggest a new method to predict the stability limit of high temperature air combustion. For the first stage of this study, we investigated the effects of dilution by the burned gas on the ignition delay time. Dilution ratio is introduced to quantify the magnitude of dilution in high temperature air combustion with a parallel jet burner. The effects of dilution on the ignition delay time are evaluated by a chemical characteristic time with the dilution ratio. Flamelet equations are solved numerically to investigate the effects of dilution on the ignition delay time. Ignition time is defined as the time at which a temporal increase in maximum temperature becomes its maximum. The ignition delay time based on the maximum temperature includes durations of radical pool growth and of most reactive region movement. The ignition delay time based on the maximum value of Damköhler number corresponds to the duration of radical pool growth. With an increase in the dilution ratio, the ignition delay time based on the Damköhler number decreases, and then increases. This trend is attributed to the increase in temperature of mixture and the decrease in reactant concentration with the dilution ratio. The introduction of chemical characteristic time has generalized the ignition delay time.

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