基于Fluent自振脉冲射流腔体结构参数的数值优化

发布时间：2019-01-28 10:48

【摘要】：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.
[Abstract]:Self-excited oscillating pulse jet can effectively improve the efficiency of deep coal erosion. In order to design a self-excited oscillating pulse jet generator with high efficiency of breaking coal and rock, based on the basic principle of hydrodynamics, the self-excited oscillating pulse jet was numerically simulated by Fluent software. The influence of different cavity structure on the peak velocity of pulsed jet is analyzed. The large eddy model (LES) is used to calculate. The numerical simulation results show that the self-excited oscillating pulse jet velocity cloud and pressure cloud are in accordance with the vortex collision theory and the principle of pulse jet generation. Under certain parameters (cavity length L = 4.5mm, cavity diameter D = 8mm, lower collision wall convergence angle 伪 = 120 掳, upper and lower nozzles diameter respectively D _ 1 / 1 mm / d _ 2 ~ (-1) mm), the maximum peak velocity of self-excited oscillating pulse jet is 231.21 m / s / s, respectively. Compared with the inlet velocity, the effect of pulse jet erosion is better.
【作者单位】：中北大学机械与动力工程学院;煤与煤层气共采国家重点实验室;首都航天机械公司;
【基金】：山西省煤层气联合研究基金资助项目(2015012018) 中北大学研究生科技立项资助项目(20161308,20161309)
【分类号】：TE37

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