造船協會論文集
Online ISSN : 1884-2062
ISSN-L : 0514-8499
実験用送風機による実験 (その2)
角オリフィスの特性および丸ダクト分岐部分流特性に関する研究
樋口 道之助瀬川 正人
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ジャーナル フリー

1965 年 1965 巻 118 号 p. 328-336

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This paper deals with results of tests made on the following matters.
(1) The flow through the rectangular orifice fitted on a rectangular air duct.
(2) The divided flow at the tee branch for a circular air duct.
As the results of expeiments, the following empirical formulae have been obtained
(1) Coefficient of resistance at the rectangular orifice.
ζ= (AdA0-1) 2
α=0.625+0.375 (A0/Ad) 3
(2) Loss in the divided flow at the tee branch for a circular air duct.
Main duct P=0.05 Hm 0.6 S2Hm
Branch duct P=0.99 Hm+0.341 Hb
Where
ζ=coefficient of resistance
A0=sectional area of orifice
Ad=sectional area of duct
P=pressure loss, mmAq
Hm=velocity head in the main duct, mmAq
Hb=velocity head in the branch duct, mmAq
S=flow quantity ratio

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