Abstract
本文是用數值方法模擬噴霧中的單一油滴之引燃情形。由於噴霧中的油滴間之距離不同，噴霧油滴大小亦不相同及燃油霧化前可能已經存在氣相燃油的情形，因此本文將針對這三個因素對引燃的影響作一番探討。結果顯示，當改變外界環境大小時，引燃極限溫度存在一最小值，而該最小值是發生在環境半徑為油滴半徑的40倍時，而且環境半徑為油滴半徑的70倍時，可視該油滴所處的環境為無限大。結果亦顯示油滴愈大，引燃能量愈低，及初始燃油濃度愈大，引燃能量愈低。Ignition temperature and ignition energy of a single droplet ina finite domain are analyzed numerically. The effects ofdistance between droplets and droplet size are investigated indetail. In addition, the influence of the initial concentrationof the fuel vapor on ignition is studied. The results show thatthe ignition energy decreases as the droplet size and theinitial concentration of fuel vapor increases. The results alsoshow that there exists a minimun ignition temperature if theambient radius is 40 times of the droplet radius. As theambient radius is 70 times of the droplet radius, the dropletcan be considered to be in an infinite ambience.