冰级船板式换热器流动传热分析及结构优化

Analysis of Flow and Heat Transfer and Structural Optimization of Polar Ship Plate Heat Exchanger

采用数值模拟方法研究换热板结构对冰晶两相流换热机制和流动特性的影响。研究结果表明:波纹倾角β=60°、波纹深度h=4 mm、波纹间距λ=12 mm为所研究的换热器适用于海水-冰晶两相流的最佳值。利用宽通道对其进行结构优化设计,并采用相关试验数据验证。结果表明:宽通道间距为16 mm时,换热强度最大,流动阻力较小,可有效防止冰晶堵塞板内沟槽,且此时的换热效果和流动特性最佳,适合极地工况下冰晶两相流流动换热。

CFD was employed to study the heat transfer mechanism and flow characteristics of seawaterice two-phase flow with different heat transfer plate structures. The results show that the ripple inclination angle β=60°, the ripple depth h =4 mm, the ripple spacing λ = 12 mm are the best values for the plate heat exchanger to be applied to the seawater-ice particle two-phase flow. Wide channel was used to optimize the structure of the heat exchanger, and was verified by experimental data. The results show that when the wide channel space is 16 mm, the heat exchanger has largest heat transfer strength and minimal flow resistance, which can effectively prevent the ice crystal block in the groove of the plate, and the heat exchanger has best heat transfer effect and flow characteristics, so it can be applied to the seawater-ice two-phase flow heat transfer in polar conditions.