曲がりを伴う矩形管内の乱流に関する実験的研究

URI http://harp.lib.hiroshima-u.ac.jp/it-hiroshima/metadata/12049
ファイル
タイトル
曲がりを伴う矩形管内の乱流に関する実験的研究
別タイトル
A Study on the Turbulent Duct flow in a Three-Dimensional Duct with Curvature
著者
氏名 宇都宮 浩司
ヨミ ウツノミヤ コウジ
別名 Utsunomiya Koji
氏名 中西 助次
ヨミ ナカニシ スケツグ
別名 Nakanishi Suketsugu
キーワード
Turbulent Flow
Curved Duct
Internal Flow
Three Dimensional Boundary Layer
Secondary
抄録

The turbulent flow in a duct with curvature was investigated by measuring the three dimensional flow fields. Because of the secondary flow influenced by centrifugal force in a curved duct, the effect of duct contraction and expansion were examined. The cross sectional size of the rectangular duct was 120mm by 240mm, with a curvature of 200°. The experiments were conducted for three duct geometries: a constant duct width (the standard case), a contraction in duct width, and a duct expansion. The changes in duct width took place from the latter half of the duct curvature as it transitioned to the straight duct section. The results indicated that for the case of an expanding duct, the velocity defect flow was larger, turbulent intensity increased, and the turbulent boundary layer thickened and expanded in three dimensions, as compared with the standard straight duct case. When the flow was contracted, the turbulent intensity and the turbulent boundary layer thickness both decreased, with greater uniformity of the velocity profiles, as compared with the standard case.

掲載雑誌名
広島工業大学紀要. 研究編
48
開始ページ
15
終了ページ
21
出版年月日
2014-02
ISSN
1346-9975
NCID
AA11599110
本文言語
日本語
資料タイプ
紀要論文
著者版フラグ
出版社版
区分
it-hiroshima