矿用降尘自激振荡喷嘴腔体直径仿真和实验优化

Simulation and Experimental Optimization on Cavity Diameter of Mine Dust Self-excited Oscillation Nozzle

针对影响自激振荡喷嘴的关键参数,分别利用流体动力学软件仿真和实验测试研究了自激振荡喷嘴内外流场。结果表明:在贴近喷嘴两侧壁面处及碰撞壁处会产生涡旋,涡旋的存在可以基本充满整个喷嘴内部腔体,使喷嘴内部湍流扰动得到加强。腔体直径准15 mm喷嘴内部扰动达到最强。雾化粒度D_(50)随着射流水压的增加均表现出减小的变化规律。雾化粒度D_(50)随喷嘴腔体直径的增加表现出单调减小的变化规律。综合考虑选取喷嘴腔体直径准15 mm是较为优的选择。

Key parameters affecting the self-excited oscillation nozzle, respectively, fluid dynamics software simulation and experimental test was used to study the self-excited oscillation flow field inside the nozzle. The results showed that in the wall is close to the nozzle and the collision of reactor generates vortex, the existence of the vortex can be basic internal cavity is filled with the whole nozzle, the nozzle is strengthened internal turbulence.15 mm nozzle cavity diameter internal disturbance to the strongest. Atomized particle size D50reduced with the increase of jet pressure are showed. Atomized particle size D50 with the increase of the nozzle cavity diameter showed the changing rule of the monotone decreasing. Considering selecting nozzle cavity diameter of 15 mm is more optimal choice.