Numerical study on spherical flame propagation in dispersed liquid ammonia droplets

HANDLE

抄録

Directly using liquid ammonia in combustion devices can simplify the fuel supply system and reduce equipment costs. However, the detailed ignition and propagation mechanisms of liquid ammonia flames have not been fully understood. This study aims to investigate the ignition and propagation of liquid ammonia flames numerically under various conditions. Spherically expanding liquid ammonia flames are studied using detailed chemistry. The effects of initial temperatures, droplet diameters, equivalence ratios, and heat fraction are investigated. The results indicate that the rapid flash boiling of liquid ammonia droplets leads to a strong local heat loss, hindering the ignition and propagation of the flame. Preheating can significantly increase the reaction rate, which compensates for the heat loss caused by phase change, allowing the flame kernel to ignite and propagate outwards. While droplet-flame interaction is present but not significant due to the rapid evaporation of liquid ammonia. The effect of droplet on the flame surface curvature is only distinguishable at conditions of large diameter. Equivalence ratio and ammonia heat fraction ratio change the amount of liquid ammonia. The more liquid ammonia, the more heat is absorbed by the phase change process, making the flame more difficult to be ignited.

収録刊行物

  • Fuel

    Fuel 357 (Part A), 2024-02-01

    Elsevier BV

キーワード

詳細情報 詳細情報について

  • CRID
    1050861383096058752
  • ISSN
    18737153
    00162361
  • HANDLE
    2433/286341
  • 本文言語コード
    en
  • 資料種別
    journal article
  • データソース種別
    • IRDB

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