花瓣孔板纵流式换热器的研发及试验研究Experimental Investigation and Development of the Petal Orifice-Baffle Longitudinal Flow Type Heat Exchangers
吴金星,魏新利,董其伍,刘敏珊
摘要(Abstract)：
提高纵流式换热器在较低雷诺数下的传热效率,关键是改善换热器的管束支撑结构。为了解决现有杆式支撑流通面积大、扰流作用不足以及孔板式支撑结构复杂、加工困难的问题,在对折流杆和孔板支撑进行结构和性能分析的基础上,开发了一种结构相对简单的花瓣孔板支撑,并建立了纵流式换热器的试验模型和试验装置。通过对花瓣孔板与折流杆两种换热器进行对比试验,结果表明:在雷诺数Re=1900～7500范围内,二者的总传热系数K都随着雷诺数Re的提高而增大,花瓣孔板换热器比折流杆换热器的总传热系数K平均提高约40%,但压降稍大。可见,花瓣孔板换热器在较低雷诺数下具有良好的传热和压降综合性能,并且花瓣孔板的结构简单、制造方便。相邻两块花瓣孔板交错布置可实现换热管的全方位约束,因而具有良好的防振和抗振能力。
关键词(KeyWords)： 纵流式换热器;花瓣孔板;折流杆;管束支撑;强化传热
基金项目(Foundation): 郑州大学青年骨干教师资助项目;; 郑州大学“十五”“211工程”重点建设学科:能源科学与技术资助项目
作者(Author): 吴金星,魏新利,董其伍,刘敏珊
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