基于Fluent自振脉冲射流腔体结构参数的数值优化

Numerical Optimization of the Structure Parameters of the Self-Vibration Pulse Jet Cavity Based on Fluent

自激振荡脉冲射流可以有效提高深部煤岩破蚀效率.为设计破蚀煤岩效率较高的自激振荡脉冲射流发生装置,基于流体力学基本原理,利用Fluent软件对自激振荡脉冲射流进行数值模拟,分析不同的腔体结构对脉冲射流峰值速度的影响.采用大涡模型(LES)进行计算,通过数值模拟发现,自激振荡脉冲射流速度云图和压力云图符合涡旋碰撞理论和脉冲射流发生原理.在特定的参数(腔长L=4.5mm,腔径D=8mm,下碰撞壁收敛角α=120°,上下喷嘴直径分别为d_1=1mm,d_2=1.1mm)下,自激振荡脉冲射流峰值速度最大,为231.21m/s,相比于入口速度提高了92.68%,脉冲射流冲蚀效果较好.

The efficiency of deep coal rock burst can be effectively improved by self-excited oscillation pulsed jet.In order to design the self-excited oscillation pulsed jet device with higher coal rock burst efficiency,based on the basic principle of fluid mechanics,Fluent software is used to do the numerical simulation of the self-excited oscillation pulsed jet,and to do the analysis of the influence of cavity structure of different pulse jet peak velocity.The large eddy model（LES）is used to calculate.The numerical simulation shows that the velocity chart and pressure cloud diagram of self-excited oscillation pulse jet accord with the vortex collision theory and the principle of pulse jet generation.The peak velocity of selfexcited oscillation pulsed jet is gotten under the particular parameters（Length L=4.5 mm,Cavity diameter D=8 mm,Collision wall convergence angle alphaα=120°,the upper and lower nozzles diameter are respectively d_1=1 mm,d_2=1.1 mm）,The maximum velocity of self-excited oscillation pulsed jet is 231.21 m/s,which is 92.68% higher than that of inlet velocity,and the effect of pulse jet erosion is better.