摘要
采用分离涡模拟方法(Detached Eddy Simulation,DES)针对平底水力旋流器的特殊结构进行了清水流场三维湍流流动的数值模拟.与RNG k-ε模型、雷诺应力模型的计算结果比较后发现,DES方法所预测出的切向速度结果与实验结果吻合最好,从而验证了DES方法在水力旋流器数值模拟方面的可行性.进一步分析了在一定入口流量下平底水力旋流器内部流场的切向速度、轴向速度、径向速度及静压力的分布特征以及局部流动现象,获得了有关平底水力旋流器内流场流动结构的丰富的信息,讨论了圆柱结构内的流动特征对固液分离可能存在的影响.分析表明平底水力旋流器的内流场呈现出兰金涡的特点,并且为非对称分布,其内部的能量损耗主要集中在受强制涡影响的中心轴线附近区域内.本文结果为进一步研究平底水力旋流器的流场特征提供了参考.
Detached-eddy simulation （DES） method was used to simulate the internal three-dimensional turbulent flow inside a flat bottom hydrocyclone. Compared with results of RNG k-ε and RSM, it is found that the tangential velocity predicted by DES method is in the best agreement with the measured results in the publication, which verifies the feasibility of DES method on computational simulation of hydrocyclone. Furthermore, the field of tangential velocity, axial velocity, radial velocity and static pressure in the fiat bottom hydrocyclone obtained with DES method at a certain flow rate were investigated in detail, and comprehensive information about the flow structures inside the hydrocyclone was obtained. The potential influence of the flow structures on liquid-solid separation was also discussed. The results show that the flow field is characterized by Rankine vortex that has a non-symmetrical distribution, and the energy dissipation in the hydrocyclone mainly occurred in the forced vortex influenced central areas. The results can be helpful for design and optimization of fiat bottom hydrocyclones.
出处
《力学季刊》
CSCD
北大核心
2014年第1期22-31,共10页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(51176127)
上海市教委科研创新项目(12YZ096)
高等学校博士学科点专项科研基金联合资助项目(20123120110009)
