矩形直角棒付型 (T 型) 合流接合の合流損失に関する研究 (第一報)

概要

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While many studies of the design of supply duct systems have been conducted, return duct systems seem to be the neglected stepchild whom no one cares about. Because of this lack of attention on the return duct systems, the design air-flow rate may not be attained and the performance of the entire system may be unsatisfactory. The author attempts to evaluate the branch-to-main loss coefficient in case of the 90 degree rectangular batt junction of return air duct systemes. By utilizing the law of conservation of momentum and the Bernouli's equation which are applied to the stream in the mainduct with batt junction, the new theoretical equation is obtained as follows; [numerical formula] where §_b : branch-to-main loss coefficient V_u : main velocity downstream of the junction V_b : branch velocity M : ratio of cross-sectional area of main to that of branch A, K : correction factor s : deviating angle of branch flow at entrance of main duct n : constant This equation has been based on Lavin-Taliev's and Ito's theoretical equations. However, it has been improved to be applicable to the rectangular duct junction with great aspect ratio by introducing n valus. If n and Ksinε are used as proper estimated valus, the fairly exact valus of the coefficient can be obtained from the equation. This facts have been confirmed by several experimental results the author had obtained.
社団法人日本建築学会の論文
1976-07-30