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

摘要： 应用数值模拟方法，分析了以周期性方式布置不同结构通道内产生的周期性自震荡流动现象，并研究了自激震荡流对下壁面物块传热特性的影响。计算采用低雷诺数、二维、非稳态层流模型。采用布置斜板和布置两个不同弯曲方向叶片等三种方式来诱导自激震荡流。分别对不同结构通道内流体的流场、温度场、努塞尔特数和表面摩擦系数变化规律进行了对比分析。计算结果发现：三种结构由稳态过渡到自震荡流时对应的临界雷诺数都很低，分别为620、480、400，并且有较低临界雷诺数的通道结构对应较强烈的震荡，表现为沟槽区域的强烈涡结构运动，及由此带来的更好换热效果。此外，表面摩擦系数因通道涡结构相异而有不同的变化趋势。

关键词: 自振荡流, 沟槽通道, 斜板, 叶片