不同汽源参数对船用蒸汽蓄热器充汽过程影响的数值研究

Numerically Investigating Influence of Different Steam Source Parameters on Charging Process of Marine Steam Accumulator

摘要: 采用考虑汽液两相蒸发与冷凝的两流体模型和热相变模型，基于不同充汽流量和温度耦合的边界条件，进行了不同汽源参数下船用蒸汽蓄热器充汽过程数值模拟，分析了不同充汽流量和温度对蒸汽蓄热器充汽过程动态特性的影响。计算结果表明，充热能量一定条件下，充汽温度越高，蓄热器内部蒸汽温度越高，温度场和速度场分布越不均匀；充汽流量降低，蒸汽射流效应更加强烈。

Abstract: Two-fluid model and thermal change model with considerations of evaporation and condensation for vapor and liquid were utilized. Based on the coupled boundary conditions with different charging flow rates and temperatures, numerical investigation on the influence of different steam source parameters on charging process of marine steam accumulator was carried out. Effects of different charging flow rates and temperatures on the dynamic characteristics of charging process for steam accumulator were analyzed. The calculated results showed that higher charging tem-perature resulted in higher temperature for steam in an accumulator in the term of certain charging energy per unit time, causing nonuniform temperature and flow field. Lower charging flow rate could cause stronger steam jet.