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采用蔡升华质热比拟技术对首排管径增大时：ｓ１／ｄ＝３，ｓ２／ｄ＝１．１的顺排管束的强制对流换热进行了实验研究，管径比的范围为ｄ１／ｄ＝１．０～１．４４，Ｒｅｙｎｏｌｄｓ数的范围为３０００～１００００．通过对局部与平均换热系数的测量表明：首排管径增大时，后排管的换热与标准顺排管束相比显著增强；管径比越大，影响的排数越多；文中给出了３种管径比下的修正系数，本文的研究结果对解决现代大容量电站锅炉的对流过热器和屏式过热器的同片热偏差有着重要的意义。
Cai et al heat transfer simulation technology for the first row of pipe diameter increases: s1 / d = 3, s2 / d = 1.1 of the tube bundle forced convection heat transfer experiments were conducted, the diameter ratio range d1 /d=1.0 ~ 1.44, Reynolds number in the range of 3000 ~ 10000. Through the measurement of the local and average heat transfer coefficients, it is shown that the heat transfer of the rear row of tubes is significantly enhanced compared with that of the standard tube bundle when the diameter of the first row is increased. The larger the tube diameter ratio is, The correction factors at three tube diameter ratios are given. The results of this paper are of great significance to solve the same chip thermal deviations of convection superheaters and screen superheaters in modern large-capacity utility boilers.