STRAIGHTENING DEVICE FOR DUCT

To provide a straightening device for a duct, which reduces unevenness in gas flow velocity distribution on the inflow side of a bend part, hardly causes separation of a gas in a straight pipe part on the outflow side of the bend part, and does not cause excessive increase of flow velocity.SOLUTION: A straightening device has a plurality of straightening plates 5 in the inside of a bend part 2 of a duct 1 which has straight tube parts 3, 4 and the bend part 2. Both ends of the straightening plates 5 lead to the straight tube parts 3, 4, and straightening plate intervals, which comprise intervals (A1 A2, ... A5 A6) between the straightening plates 5 and an interval (A0 A1) between the straightening plate 5 and the inner peripheral side of the bend part 2, expand from the inner peripheral side of the bend part 2 toward the outer peripheral side thereof.SELECTED DRAWING: Figure 1 【課題】曲折部の流入側のガス流速分布の偏りが低減し、かつ曲折部の流出側の直管部におけるガスの剥離が生じにくく、流速の過大化もないダクトの整流装置を提供する。【解決手段】直管部３、４と曲折部２を有するダクト１の曲折部２の内部に複数の整流板５を具備した整流装置であって、整流板５の両端が直管部３、４に至り、整流板５同士の間隔（Ａ1Ａ2、...、Ａ5Ａ6）及び整流板５と曲折部２の内周側との間隔（Ａ0Ａ1）からなる整流板間隔が、曲折部２の内周側から外周側に向かうにつれて拡大している。【選択図】図１