摘要
采用基于欧拉-拉格朗日的双向耦合模型对三维气固两相平面射流中颗粒与流体的双向耦合作用进行了直接数值模拟。在考虑颗粒相的反作用后,气相运动采用直接耦合求解,计算颗粒场时,选取Stokes数为0.1的较小颗粒,采用Lagrangian方法跟踪其运动。重点考察了颗粒相与流体相之间的相互作用,分析了不同固相载率的颗粒对流场特性以及对自身扩散的影响。模拟结果表明由于颗粒的影响,在射流入口处流场最初生成的两个大涡沿横向被拉伸,而在射流下游区域,涡结构则沿流向被拉伸;在射流的下游,颗粒降低了流场中心区域的流向平均速度,削弱了流场中心区域的湍流强度。此外,跟单向耦合相比,双向耦合情况下的颗粒分布更加均匀,并且均匀程度随固相载率的增加而增大。
The two-way coupling model based directly simulate the two-way coupled interaction on the Euler-Lagrangian method is applied to between particles and fluid in a three-dimensional gas-solid two-phase plane turbulent jet. The directly coupled method is adopted to solve the flow field considering the feedback force of particles. Lagrangian method is used to trace the particles. For the smaller particles with Stokes number of 0.1, the interactions between the particles and fluid are investigated, the effects of particles with different mass loadings on flow field and the corresponding dispersion pattern of particles are studied. The results show the two initial large-scale vortex structures are stretched towards the lateral direction at the inlet of the jet, but the vortex structures are stretched towards the streamwise direction in the downstream region of the jet due to influence of particles. And in the down stream of the jet, particles decrease the streamwise mean velocity and attenuate the turbulence intensity in the core region of the flow field. Moreover, compared to the one-way coupling method, particles disperse more homogeneously under the condition of two-way coupling method, and the degree of homogeneity are enhanced as the increase of particle mass loading.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第6期977-980,共4页
Journal of Engineering Thermophysics
基金
浙江省自然科学基金重点项目(No.Z107332)
关键词
双向耦合
气固两相三维射流
直接数值模拟
two-way coupling
gas-solid two-phase three-dimensional jet
direct numerical simulation
