涡轮桨搅拌槽内流动特性的大涡模拟

被引:10
作者
李志鹏
高正明
机构
[1] 北京化工大学化学工程学院
关键词
计算流体力学(CFD); 大涡模拟(LES); 流动特性; 搅拌槽; 涡轮桨;
D O I
暂无
中图分类号
TQ019 [模拟原理、相似原理及因次分析在化工中的应用];
学科分类号
0703 ;
摘要
利用大涡模拟方法研究了涡轮桨搅拌槽内的流动特性,采用了三种亚格子模式:标准Smagorinsky-Lilly模式(SLM)、Smagorinsky-Lilly动力模式(DSLM)和亚格子动能动力模式(DKEM),并将模拟结果与标准k-ε模型及文献实验数据进行了详细的比较。结果表明:大涡模拟方法可获得搅拌槽内的瞬态流场;对桨叶区时均速度及湍流动能的预测与实验数据相吻合,比标准k-ε模型计算结果有明显改进,三种亚格子模型中DSLM和DKEM模拟结果更好。同时分析了大涡模拟中桨叶端部附近湍流动能估计偏差的原因,发现主要是由于对轴向湍流均方根速度的预测偏差造成的。大涡模拟方法为搅拌槽内非稳态、周期性的湍流流动和湍流特性的研究提供了强有力的工具。
引用
收藏
页码:592 / 597
页数:6
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