LIU Xiaoqian, GAO Zhenqiang, LIU Yongqi, LIU Ruixiang, MENG Jian

(School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, Shandong, China)

Abstract: 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.

Key words: honeycomb ceramic, heat exchanger, flow around cylinder, flow induced vibration