湍流射流中示踪粒子的跟随性数值模拟分析

发布时间：2018-04-19 22:29

本文选题：大涡模拟 + 离散相模型　；参考：《上海理工大学学报》2017年02期

【摘要】：为了探究聚苯乙烯颗粒在射流场中的跟踪效果,采用大涡模拟(LES)方法求解射流流场,并与实验结果进行对比,以验证流场模型.定义了密度与水相同的5种不同粒径的虚拟颗粒,采用离散相模型(DPM)计算其运动轨迹,将其响应时间的理论分析结果与数值模拟结果进行对比,验证了DPM模型的准确性.随后对粒径范围为1~400μm的11种不同粒径的聚苯乙烯颗粒在一定雷诺数射流流场中的跟随特性进行了模拟计算,并与初始时刻相同位置的质点运动轨迹进行对比分析.结果表明,流场的复杂变化对颗粒的跟随性有很大影响,这表现在即使颗粒粒径很小时,颗粒与流场的速度依然存在一定偏差.在所研究工况下,粒径小于200μm的聚苯乙烯颗粒与水的速度偏差大部分在20%以内.
[Abstract]:In order to investigate the tracking effect of polystyrene particles in the jet field, the large eddy simulation (les) method is used to solve the jet flow field, and the experimental results are compared to verify the flow field model. Five kinds of virtual particles with the same density as water were defined. The motion trajectory was calculated by discrete phase model (DPM). The theoretical analysis results of the response time were compared with the numerical simulation results, and the accuracy of the DPM model was verified. Then, the following characteristics of 11 polystyrene particles with different particle sizes in the flow field of a certain Reynolds number jet are simulated and calculated, and the trajectory of particle motion at the same position at the initial time is compared and analyzed. The results show that the complex variation of the flow field has a great influence on the particle following performance, which shows that even if the particle size is very small, there is still a certain deviation between the particle and the velocity of the flow field. Under the studied conditions, the velocity deviation between polystyrene particles with diameter less than 200 渭 m and water is mostly within 20%.
【作者单位】：上海理工大学能源与动力工程学院;上海理工大学上海市动力工程多相流动与传热重点实验室;
【基金】：国家自然科学基金资助项目(51576130) 上海市科委科研计划(13DZ2260900) 上海市教委资助项目(14CG46)
【分类号】：O358

【相似文献】