传统圆盘-圆环折流板存在流动阻力较大以及局部死区明显等问题。针对上述问题,提出了百叶与圆环交替布置的折流板结构,并构建了新型百叶-圆环折流板的管壳式换热器。对比分析了弓形折流板、圆盘?圆环折流板、百叶?圆环折流板以及圆环?百叶折流板四种结构管壳式换热器的壳程传热与流动阻力特性,并探讨了百叶倾角对百叶?圆环折流板换热器壳程传热性能的影响。结果表明,百叶?圆环折流板的压降在四种结构中最低,相较于相同参数的圆盘?圆环折流板平均降低了6.41%,同时总传热系数提高了4.77%。对不同百叶倾角的分析结果显示,当倾角为25°时换热器的综合性能最优,此时壳侧流场分布更加均匀,传热强化效果更为显著,其壳侧压降平均降低15.43%,总传热系数和努塞尔数分别平均提高了7.04%和5.20%,综合性能评价因子PEC平均达到1.16。

Traditional disc-and-donut baffles suffer from significant flow resistance and pronounced local dead zones. To address these issues, a novel baffle configuration featuring an alternating arrangement of louvers and donuts was proposed, and a corresponding shell-and-tube heat exchanger (STHE) with louver-donut baffles was developed. The shell-side heat transfer and flow resistance characteristics of four STHE structures—namely segmental baffles, disc-and-donut baffles, louver-donut baffles, and donut-louver baffles—were comparatively analyzed. Furthermore, the influence of the louver inclination angle on the shell-side thermal performance of the louver-donut baffle heat exchanger was systematically investigated. The results demonstrate that the louver-donut baffle exhibits the minimum pressure drop among the four configurations, achieving an average reduction of 6.41% compared to the disc-and-donut baffle with identical parameters, while simultaneously enhancing the overall heat transfer coefficient by 4.77%. Analysis of varying louver inclination angles indicates that the heat exchanger achieves its optimal comprehensive performance at an inclination angle of 25°. At this optimal angle, the shell-side flow field becomes more uniform, and the heat transfer enhancement effect is more significant. Specifically, the shell-side pressure drop is reduced by an average of 15.43%, while the overall heat transfer coefficient and Nusselt number increase by an average of 7.04% and 5.20%, respectively. Consequently, the average performance evaluation criterion (PEC) reaches 1.16.

内蒙古自治区科技计划项目(NO.2023YFHH0070)；内蒙古自治区科技重大专项项目(NO.2021ZD0036)