有限旋转气流的切向速度特性分析

已有的试验结果表明：有限旋转气流的切向流速，在旋流器出口头部区域常出现双峰分布，本文分析了出现此现象的两种情况，认为有内外两个旋涡交织在一起所形成的复合涡是切向速度出现双峰分布的根本原因，并根据涡运动基本理论，提出了复合涡的理论模型；对无回流旋转区段，具有中心回流区段，和复合涡回流区段的切向速度分布进行了分析。

Analysis on the tangential velocity behavior of the confined swirling flow

The experiments show there is dual peaks of the tangential ve locity profile in the front area after swirler in the confined swirling flow. Th is paper presents that the complex vortex which two vortex are interwoven with e ach other is the radical cause for dual peak phenomenon which tangential velocit y profile appears after two conditions are discussed in which flows have a annul ar recirculation and a central recirculation zone encircled by corner recirculat ion zone respectively. Mathematical controlled equations of complex vortex are p ut forward according to fundamental vortical movement theory. The analysis on th e tangential velocity distribution in the non-recirculation zone, central recirc ulation zone and complex vortex recirculation zone are carried out respectively. The conclusions are derived that the tangential velocity profile in the non-rec irculation zone is simulated in Burgers vortex, that in the central recirculatio n zone is modeled in Rankine vortex, and that in the complex vortex recirculatio n are fitted in with the formulae which are presented by this paper