关键词: 自振荡流, 沟槽通道, 斜板, 叶片

Abstract: A numerical investigation of the heat transfer characteristics and the self-sustained oscillations flow is conducted in a grooved channel with periodic mounted different structure. Control of low Reynolds number range(400-1600), two-dimensional, unsteady laminar flow was analyzed.Three structures of using oblique plate and two curve vanes with different direction was considered to induce the self-sustained oscillations flow. A comparison among different channels was made for streamlines,isothermal,Nusselt number(Nu) and friction factor. The research found that the critical Reynolds number was low, the value is 620,480,400,respectively. And in the channel with the lower critical Reynolds number, the oscillation was drastic. The corresponding performance was strong vortices movement in the groove areas, to create better heat transfer. For the same Reynolds number ,the oscillation period of three kinds of channel were roughly equal, but the self-sustained oscillations characteristics were different.The friction factor had different change trend because of the different vortex in the channel. When Reynolds number was over 800,the value of friction coefficient of the GCCV1 and GCCV2 channel was averagely three times as the value of friction coefficient of GCOP channel,while the same trend was also presented in the heat transfer of the three channels.

Key words: self-sustained oscillations flow, groove channel, inclined plate；vane