基于CFD的煤矿降尘用微振荡腔高效雾化喷嘴参数分析

Parameter Analysis of High Efficiency Atomizing Nozzle with Micro-oscillation Cavity for Coal Mine Dustfall Based on CFD

为了提高煤矿降尘喷嘴的雾化效率,通过对斜壁进行微振荡腔结构设置的方式来提高喷嘴内部湍流性能,并通过CFD仿真平台对斜壁倾角以及入口压力参数进行了优化分析。结果表明:倾角的设置对喷嘴的雾化效果有较大影响,当θ为60°、52.5°时,在谐振腔与微振荡腔的作用下,内腔室和微振荡腔内均有涡漩产生,对内部流场扰动明显,激振效果好。当θ为45°时,微振荡腔对流场无明显激振作用。对比θ为60°、52.5°时,后者角度设置合理,灌入和冲出微振荡腔的流体较多,涡漩负压区的压力差更大,湍流动能更高,对流场的扰动效果最佳。进口压力越大,涡漩处负压值越大,湍流动能越高。进口压力为7 MPa时,喷嘴的激振效果最明显,雾化效果最优。

In order to improve the atomizing efficiency of the coal mine dust fall nozzle,the internal turbulence performance of the nozzle was improved by setting the inclined wall with a micro-oscillation cavity structure,and the inclined wall inclination angle and inlet pressure parameters were optimized and analyzed by CFD simulation platform.The results show that the setting of the inclination angle has a great influence on the atomization effect of the nozzle.Whenθis 60°and 52.5°,under the action of the resonant cavity and the micro-oscillation cavity,vortex is generated in both the inner cavity and the micro-oscillation cavity,which has obvious disturbance to the internal flow field and good excitation effect.Whenθis 45°,the micro-oscillation cavity has no obvious excitation effect on the flow field.When the contrastθis 60°and 52.5°,the latter angle setting is reasonable,more fluid is poured into and out of the micro-oscillation cavity,the pressure difference in the vortex negative pressure region is larger,the turbulence kinetic energy is higher,and the disturbance effect of the convection field is the best.The greater the inlet pressure,the greater the negative pressure at the vortex and the higher the turbulence kinetic energy.When the inlet pressure is 7 MPa,the excitation effect of the nozzle is the most obvious and the atomization effect is the best.