冷凝式燃气热水器级间连接段流场分析  

Investigation on the flow field in the connection section between two heat exchangers of a condensate gas water heater

作　　者：何川[1] 梁红强[1] 王延军[1] 段志强[1] 王丹[1] 龙天渝[2] 

机构地区：[1]重庆大学动力工程学院,重庆400044 [2]重庆大学城市建设与环境工程学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2010年第10期50-56,共7页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(50876118)

摘　　要：通过对冷凝式燃气热水器内部烟气流场的分析,提出了用收缩烟道连接冷凝式燃气热水器的两级换热器,并在冷凝段下方布置带孔斜板收集冷凝水的新型结构,用数值模拟方法对级间连接段的流场进行了研究。研究发现,收缩段的结构对冷凝式燃气热水器的性能有重要影响,其斜板的倾角和板上孔的分布以及换热管的排列存在着最佳结构,采用该结构的收缩段,可以使烟气以较高的速度均匀地流过冷凝换热管,从而有效地提高其换热效率。This paper investigates a new type of condensate gas water heater,which consisted of a burner,a high temperature heater exchanger （i.e. rut exchanger） and a low temperature heater exchanger （i.e. subjoin exchanger or condensate exchanger）. These components are set vertically one by one with a same rare plane. The subjoin exchanger is set at top and smaller in width than the rut exchanger and burner. A lean plane with some holes is set in the connect channel between the two exchangers aslant. As the flue gas flow crows the subjoin heater exchanger,the gas temperature will be below the dew point,and the same steam in the gas condensed into water. These blobs drip to the lean plane and are collected through the holes on the plane. The flow field of the connect channel and subjoin exchanger affected by the dip angle and holes distribution of the lean plane is investigated with CFD. The results show that there is a suitable configuration about the dip anger,hole＇s diameter and distribution of the lean plane. With that configuration,the flue gas can wash the tubes of the subjoin heat exchanger homogeneously in a higher velocity than the rut exchanger does.

关 键 词：节能减排 冷凝式燃气热水器 不可压缩流体 数值研究 

分 类 号：TK124[动力工程及工程热物理—工程热物理]