摘要
为明晰船用螺旋管换热器内流体流动传热规律及其流致振动特性,提高运行效率及安全性能。本文建立船用螺旋管换热器三维模型,采用流固耦合方法进行换热器热工及水动力特性数值模拟,借助流致振动预测方法计算得到与流致振动密切相关的流体冲击能量变化特性。计算结果表明,螺旋管上、下游管间出现回流现象,极易导致杂质沉积;螺旋管上、下管壁对流传热系数小,管壁温度高,易诱发爆管现象;基于流体冲击能量变化特性,流体能量在螺旋管区域呈波峰值,且螺旋管侧管壁冲击能量高于上、下管壁,可以预测螺旋管侧管壁承受流致振动破坏较严重,实际试验数据验证了本文数值结果。
In order to clear flow,heat transfer and flow induced vibration characteristics of the ship helical heat exchanger and improve the operation efficiency and safety performance,a three-dimensional model of the ship helical heat exchanger was built. The thermodynamic and hydrodynamic characteristics of helical heat exchanger were investigated using fluid-solid coupling method. Based on the predictive mechanisms of flow induced vibration,flow energy which was closely related to flow induced vibration was generated. The calculated results showed that the backflow phenomenon occurred between upstream and downstream tube,which can easily lead to the impurity deposition. The convective heat transfer coefficient is smaller,the temperature of the tube wall is higher,inducing tube explosion phenomenon between the upper and lower tube wall. Based on fluid flow bombardment energy distributions,the maximum values of the energy were generated at the helical tube regions,meanwhile,the flow-energy for the side wall is higher than one for the upper and lower tube wall. These results could indicate flow vibration damage for the upper and lower tube wall was more serious. The actual test data of helical tube exchanger verified the numerical results.
出处
《舰船科学技术》
北大核心
2015年第9期100-104,共5页
Ship Science and Technology
关键词
螺旋管换热器
热工
水动力
helical heat exchanger
thermodynamic
hydrodynamic
