Circumferential non-uniform heat transfer characteristics of the secondary side working fluid of steam generator
Steam generator is the key equipment in the nuclear power system.The experiment system of helically-coiled tube steam generator was established to study the circumferential non-uniform heat transfer characteristics of the secondary side working fluid under the coupling heat transfer conditions.Firstly,it is found that heat transfer coefficient h does not change obviously with the increase of supercooling degree Δtsub·h0° decreases significantly,while h90°,h180° and h270° increases with the increase of secondary side system pressure p.h0°decreases slightly,but h90°,h180° and h270° remain unchanged with the increase of mass flux of secondary side working fluid Gr.h0° and h270° rising firstly and then decreasing,while h90° and h180° change not obvious with the increase of primary side heating water temperature twat.Secondly,the circumferential local non-uniform distribution factors ηt or ηh are defined to represent the difference of wall temperature tw or h in the circumferential distribution of tube cross-section,and the variation rules of ηt or ηh with the change of Δtsub,p,Gr and twat are obtained,respectively.Finally,it is concluded that ηt between coupled heat transfer heating condition and constant heat flux heating condition has little difference,but ηh has significant difference,indicating that the distribution of h of the cross-section tube is more uneven.
万方数据
维普
