作　　者： (张轩恺）; (韩东）; (何纬峰）; (岳晨）; (蒲文灏）;

机构地区： 南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室,南京210016

出　　处： 《工程热物理学报》 2017年第9期1952-1959,共8页

摘　　要： 依据涡旋流动强化传热技术,变传统直流道的梅花形支撑孔板为螺旋流道的梅花形支撑孔板,进而设计出一种新型螺旋梅花形孔板换热器,建立了相应的数学模型,并对其传热与流动特性进行了仿真计算。通过与梅花形孔板换热器的对比分析,展示了新型换热器壳程强化换热机理,并进一步探索了螺旋流道的螺旋角对新型换热器的影响。计算结果表明:在研究范围内,新型换热器壳程平均对流换热系数高于传统换热器,但同时壳程压降也相对应增加,在一定雷诺数范围内新型换热器综合性能参数优于传统换热器。当螺旋角为27°、雷诺数小于19672时,其综合性能比传统换热器较佳;探究了不同螺旋角的影响,发现螺旋角越大,新型换热器压降越大,同时换热能力也越强。 According to the effect of vortex flow on heat transfer enhancement, a novel shell-and-tube heat exchanger with screw cinquefoil orifice baffles （STHX-SCOB） by using screw type cinquefoil orifice baffles on the shell side is proposed. The corresponding mathematical and physical model of the shell side of the heat exchangers was established, and the shell side flow is simulated. By comparing with the shell-and-tube heat exchanger with cinquefoil orifice barnes （STHX-COB）, the heat transfcr enhancement mechanism in shell side of the novel heat exchanger is shown. Moreover, study on the performance of the heat exchanger with variable helical angle of screw type cinquefoil orifice baffles. The simulation results showed that the heat transfer coefficient of the novel heat exchanger and pressure drop are both higher than that of traditional heat exchanger, and the comprehensive performance of the novel heat exchanger is higher than that of traditional heat exchanger in a certain range of Reynolds number. The comprehensive performance of STHX-SCOB is better than STHX-COB when helical angle is 27° and Reynolds number less than 19672. In addition, the study shows the larger number of helical angle of screw type cinquefoil orifice baffles, the higher of the mheat transfer coefficient and pressure drop.

关 键 词： 螺旋梅花形支撑孔板 传热 数值模拟 流场 换热器