不同布置H型鳍片管束传热流动准则关联式

Correlations of heat transfer and flow characteristics of H-type finned tube bank with different arrangements

从低低温省煤器的布置方式入手,以具有防磨、防积灰特点的H型鳍片管束为例,采用数值模拟的方法研究其在顺列和错列两种布置方式下的传热与流动特性。结果表明:在顺、错列两种布置方式下,当纵向管排数≥15时,对Nu与Eu的影响可以忽略;进口流速、鳍片宽度、鳍片厚度、鳍片间距、开缝宽度和横向节距分别对两种布置方式下H型鳍片管束的Nu数与Eu数影响结果相同。鳍片宽度对Nu影响最大,鳍片间距对Eu影响最大,管束顺列布置时,开缝宽度对Nu与Eu影响最小,管束错列布置时,纵向节距对Nu数与Eu数影响最小。根据模拟数据拟合了H型鳍片管束在两种布置方式下分别对应的Nu与Eu准则关联式。研究结果可为燃煤电站低低温省煤器的优化设计提供参考。

Low-temperature economizer arrangement was introduced and the characteristics of anti-abrasion and antiash-deposition of H-type fin tube bundle were investigated. Numerical simulation was performed on the heat transfer and flow characteristics of H-type finned tube bank with in-line and staggered arrangement. Results show that when longitudinal tube increases up to 15 th rows and more,it has little impact on Nu and Eu.Inlet fluid velocity,fin width,fin thickness,fin pitch,slit width and spanwise tube pitch have the same impact on Nu and Eu under two arrangements.Fin width has the most significant effect on Nu and fin pitch has the same effect on Eu. When it is in-line,slit width has the least effect on Nu and Eu.Longitudinal pitch has the same effect on Nu and Eu with staggered arrangement.Correlations of Nu and Eu for H-type finned tubes with two arrangements are presented.The research results can provide a reference for the optimization design of lower temperature economizer in the coal-fired power station.