颗粒状腐蚀产物在水跨临界区域近壁面传质特性的模拟  

Numerical Simulation on Near-wall Mass Transfer Characteristics of Granular Corrosion Products in Water Transcritical Zone

作　　者：王超[1] 侯天琦 李鸿源[1] 徐鸿[1] WANG Chao;HOU Tianqi;LI Hongyuan;XU Hong(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《动力工程学报》2021年第2期85-90,共6页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2018YFB0604402);中央高校基本科研业务费专项资金资助项目(2018QN041,2019MS015)。

摘　　要：为研究(超)超临界机组汽水系统中腐蚀产物在跨临界区域内的沉积特性,以Fe3O4颗粒为典型腐蚀产物,采用RANS-DPM方法中SST k-ω湍流模型对腐蚀颗粒在直管内跨临界湍流中近壁面区域的传质特性进行了模拟,分析了颗粒传质随入口温度、热流密度和质量流量的变化规律。结果表明:最高近壁面温度的位置与超临界层的厚度有关;超临界层接近近壁面区域的边界时,近壁面颗粒质量浓度达到峰值;热流密度和质量流量的增加阻碍了颗粒向近壁面传质,而近壁面区域边界上的跨临界现象有利于颗粒向近壁面的传质。To investigate the deposition characteristics of typical granular corrosion products like Fe3O4 particles in transcritical region of the steam-water system in an(ultra) supercritical unit, a simulation study was carried out on the near-wall mass transfer characteristics of particles in the transcritical turbulent flow within the straight pipe based on SST k-ω model in the RANS-DPM method, while the variation of particle mass transfer with the inlet temperature, heat flux density and water mass flow rate was analyzed. Results show that the place where the highest wall temperature appears is related to the thickness of the supercritical layer;when the supercritical layer approaches to the boundary of the near-wall area, the concentration of particles in that area would reach a peak;the increase of heat flux density and mass flow rate hinders the mass transfer of particles to the near-wall area, and the transcritical phenomenon on the boundary is beneficial to the mass transfer of particles to the near-wall area.

关 键 词：跨临界湍流 近壁面流动 腐蚀 颗粒质量浓度 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]