管内非限制性旋流运动特性的研究

INVESTIGATION ON THE CHARACTERISTICS OF NON-REST-RICTED SWIRLING FLOW IN A DUCT

本文应用实验方法和数值分析研究了具有不同初始旋流强度的气流在圆管内的旋流特性,得出了不同雷诺数下、沿管子长度不同截面上的速度分布、旋流强度及其衰减规律。数值分析结果与实验资料符合良好。

This paper presents the results of experiments and numerical simulation of the turbulent swirling flow in a duct. It is found that the initial swirl intensity So is dependent on the vane exit angle of the swirler and local swirl intensity S is related to the initial swirl intensity, distance from the swirler and Reynolds number of air flow. The decay law of swirling flow in the streamwise direction is obtained. The calculated results are in well agreement with data obtained by measurements.