摘要
采用大涡模拟方法研究蜂窝陶瓷内置换热器的绕流特性,并与大空间圆柱绕流进行了对比。结果表明:在Re为692、1646、2594、3540时,在蜂窝陶瓷内置换热器背流面会形成一对小漩涡,由于蜂窝陶瓷的限制,边界层分离点位置比大空间圆柱绕流分离点靠前;蜂窝陶瓷内置换热器在所研究的范围内未出现卡门涡街现象,换热器受力稳定,表明蜂窝陶瓷的存在能有效抑制换热器流致振动现象;同样的来流速度条件下,蜂窝陶瓷内置换热器的绕流速度更高,且来流速度越大,二者的差异越大。
The flow around the heat exchanger embedded in honeycomb ceramics was studied by using the method of large eddy simulation.And the simulation was compared with the flow around a cylinder in free space. Results show that, when Re was 692, 1646, 2594, and 3540,a pair of small vortexes would be formed at the back of the heat exchanger embedded in honeycomb ceramics, and the separation point was more forward than that in free space because of the limitation of the honeycomb ceramics. There is no Karman vortex street behind heat exchanger embedded in honeycomb ceramics within the research scope. And the stress on the heat exchanger is stable. It means that the existence of honeycomb ceramics can effectively prevent the flow induced vibration. Compared with the flow around a cylinder in free space,the flow speed near the wall of the heat exchanger embedded in honeycomb ceramics is higher under the condition of the same inlet velocity,and the greater the inlet velocity is, the greater the difference is.
出处
《陶瓷学报》
CAS
北大核心
2014年第3期254-259,共6页
Journal of Ceramics
基金
国家高技术研究发展计划(863)资助项目(编号:2009AA063202)
山东省自然科学基金资助项目(编号:ZR2009FQ023)
山东省科技发展计划(编号:2012GGX10417)
关键词
蜂窝陶瓷
换热器
圆柱绕流
流致振动
honeycomb ceramic
heat exchanger
flow around cylinder
flow induced vibration
