レーザドップラー法によるディーゼル機関用傘状噴霧流の特性解析 : 第2報, LDA法による速度分布の解析

フォーマット:

論文

責任表示:

隆, 武強 ; 石間, 経章 ; 小保方, 富夫

言語:

日本語

出版情報:

日本機械学会, 1996-03-25

著者名:

• 隆, 武強
• 石間, 経章
• 小保方, 富夫

掲載情報:

日本機械学會論文集. B編

ISSN:

0387-5016    

巻:

62

通号:

595

開始ページ:

1260

終了ページ:

1267

バージョン:

VoR

概要:

application/pdf<br />Journal Article<br />To study the characteristics of velocity in a large-angle conical spray proposed for a premixed combustion type Diesel engine, steady and unsteady conical sprays were analyzed using a laser Doppler anemometer (LDA). The injection pressure for the steady conical spray was varied in three steps. For the unsteady conical spray, it was 19.6MPa, where the amount of injected fuel was 25.6mg per cycle, and the … injection frequency was 20.7Hz. As a result, the radial distributions of mean axial-velocity for both conical sprays were similar to the Goertler distribution. The Shapes of the turbulence intensity distributions of the conical sprays and a radial gas jet were similar. Their values for the steady conical spray were smaller than that for the radial gas jet, and those for the unsteady conical spray were almost the same as that for the radial gas jet in the whole experimental region. The Reynolds stress distributions for the steady conical spray and the radial gas jet were similar but the maximum value of steady conical spray was half that of the radial gas jet. The unsteady conical spray had a value of the same order of magnitude as that of radial gas jet in the whole experimental region. The rate of decrease of the unsteady conical spray velocity was 3 times that of the steady conical spray velocity but 1/6 that of the radial gas jet velocity. The rate of air entrainment into the unsteady conical spray was half that for the steady conical spray. 続きを見る