旋回流燃焼器近傍の非燃焼流れの可視化

概要

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Isothermal annular swirling flows with a central jet stream were investigated using a flow visualization technique in order to clarify flow structures near pulverized coal-fired swirl burners. The experiments revealed that the behavior of the central nonswirling jet is significantly affected by the downstream flow system geometry. For flows with a divergent burner tile, observed flow patterns were classified into four categories : type A to D in order of the swirl strength. Type A is a simple jet flow. Type B flows can be seen for the swirl numbers less than 1. 2-1. 3, and are characterized by the way that the primary jet stream rotates around the central recirculation zone. For higher swirl numbers, types C and D, which are steady and axisymmetrical unlike type B, can be seen. The observation revealed that for a certain range of swirl number the flow becomes unsteady and three dimensional, suggesting that time mean figures in terms of transport phenomena should be carefully treated for such flows.
一般社団法人日本機械学会の論文
1995-03-25