摘要
倾斜往返式冷凝器采用冷凝回流的方式来完成蒸汽的冷凝过程 ,本文在试验的基础上 ,采用两流体分析模型 ,建立了往返式冷凝器内蒸汽冷凝回流的流动分析模型 ,编制开发了相应的Matlab计算程序 ,并根据试验测得的初值条件 ,对其流场进行了数值模拟 ,并对计算结果进行了分析。结果表明 ,截面汽相所占有的份额沿管长方向逐渐增大 ;汽液两相流速沿管长方向逐渐减小 ;在相同压力下 ,当倾角 β =90°时 ,液膜最薄 ,两相流速沿管长的变化最为显著 ;当倾角一定时 ,随着压力减小 。
By adopting a form of condensate return flow an inclined reciprocating condenser completes its steam condensation process. On the basis of tests and by using a two-phase fluid analytical model set up was a flow analysis model for steam-condensate return flow in a reciprocating condenser. A corresponding Matlab computation program was prepared and developed. Moreover, on the basis of the condition of initial values measured and obtained from the tests a numerical simulation was conducted of the relevant flow field along with an analysis of the computation results. The results of the analysis indicate that the share occupied by the cross-section steam phase gradually increases along the tube length direction. Steam-liquid two-phase flow speed decreases gradually along the tube length direction. Under an identical pressure when inclination angle β equals 90°, a liquid film will have the thinnest value, and the variation of the two-phase flow speed along the tube length becomes very conspicuous. With the inclination angle β being 90° the liquid film thickness will gradually decrease with a decrease in pressure.
出处
《热能动力工程》
CAS
CSCD
北大核心
2005年第1期45-47,60,共4页
Journal of Engineering for Thermal Energy and Power
关键词
往返式冷凝器
冷凝回流
流场
reciprocating condenser, condensate return flow, flow field
