圆管管束特性试验及协同分析

Experimental research and synergy analysis on characteristics of tube bundles

为分析前排绕流扰动对后排管换热及阻力的影响规律，以4列多排（2～10）管束为研究对象，建立稳定的热态流场，采用错列及顺列2种方式，分析传热及流动特性在不同管排数下的变化规律；定量分析管排数对阻力特性的影响规律，定义了管排阻力修正系数，并根据实验数据给出了其在不同管排数下的取值；根据场协同理论定义了相对场协同率的概念，用以表征不同管排数下其总体换热效率相对实际最大换热的比值。研究结果表明，管间绕流为管束换热器管排影响规律的主要原因，10排及以上管束流场均匀，管间绕流影响最小，场协同角较小，10排以内采用管排系数进行修正。

Experimental studies, establishing a stable thermal state flow field with 4 tube rows and multiple columns （ varied from 2 to 10） in staggered and in-line arrangement, were carried out to analyze the rules of the heat transfer and flow characteristics under different tube rows to obtain the influence rules of flowing around front tubes on the resistance of back rows.In order to obtain the influence rules of the number of tube rows on the resistance characteristics, bundle resistance correction coefficient was defined and values were given according to a series of experimental data.Rate of relative field synergy based on the field synergy principle was defined to characterize the ratio of the overall heat transfer efficiency relative to the actual maximum heat transfer with different numbers of tube rows.The results showed that the flow disturbance around the tail was the major factor in the deterioration of the resistance and the enhancement of the heat transfer, the flow fields up to 10 rows were well-distributed with the minimum influence of the flow disturbance around the tail and small synergy angles, the flow fields within 10 rows should be corrected with tube row correction factor.