単純化された流れ場に形成される混相燃焼場に対するすす生成特性の光学計測

DOI Web Site
  • 林 潤
    京都大学大学院エネルギー科学研究科
  • 橋本 望
    北海道大学大学院工学研究院機械・宇宙航空工学部門
  • 赤松 史光
    大阪大学工学研究科機械工学専攻

書誌事項

タイトル別名
  • Optical Diagnostics for Soot Formation Characteristics in Multi-phase Combustion Field Formed in a Simplified Flow Field
  • タンジュンカ サレタ ナガレバ ニ ケイセイ サレル コンソウ ネンショウバ ニ タイスル ススセイセイ トクセイ ノ コウガク ケイソク

この論文をさがす

抄録

<p>Soot formation characteristics in the multi-phase combustion (spray flame and pulverized coal jet flame) in a simplified flow field were evaluated using two-dimensional laser induced incandescence (LII) and time resolved LII (TiRe-LII). For the spray flame, the effects of fuel droplet size distribution on soot formation in a laminar counterflow field are investigated. Sauter mean diameter (SMD) and droplet size distribution (DSD) of fuel spray (n-decane) are carefully controlled independently from the other conditions using a frequency-tunable vibratory orifice atomizer (VOA). Results show that the soot formation area and location are strongly affected by the SMD and by the DSD of the fuel spray. As the SMD of the fuel spray increases, the average soot formation area expands, and that the local suppression of soot formation is observed instantaneously in the spray flames because of the appearance of groups of unburned droplets. The size of soot particles in the spray flame tends to increase in the outer part of the soot formation area compared to soot in the inner part. For the pulverized coal jet flame, soot formation characteristics of a lab-scale pulverized coal flame were measured by performing carefully controlled LII and TiRe-LII for the first time. Results indicated that it is necessary to adjust the laser pulse fluence so that it is sufficiently high to heat all the soot particles to the sublimation temperature but sufficiently low to avoid making a significant change in the morphology of the soot particles and the superposition of the LII signal from the pulverized coal particles on that from the soot particles as well. Additionally, the soot volume fraction and the primary soot particle diameter increases with increasing the height above the burner in any radial distance. However, the variation of the soot particle diameter distribution along the radial direction becomes small in the downstream region. Transient soot formation processes are evaluated through simultaneous measurements of coal particles, polycyclic aromatic hydrocarbons (PAHs) and soot. Pairs of simultaneous measurements of “Mie scattering measurement for coal particles with laser induced fluorescence (LIF) for PAHs” and “LIF for PAHs with LII for soot” were performed to understand the transitive formation processes of soot particles in a pulverized coal flame, whose signals were successfully separated. Results show that existing regions of coal particles, PAHs and soot are overlapped from the time averaged viewpoint while there are almost no overlapped areas of coal particles, PAHs and soot from the instantaneous viewpoint.</p>

収録刊行物

  • 日本燃焼学会誌

    日本燃焼学会誌 63 (203), 73-85, 2021

    一般社団法人 日本燃焼学会

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ