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作 者:杨玉[1] 吴家荣 韩煜航 吴帅帅[1] 蒋世希 李凯伦[1] 张一帆[1] 李红智[1] YANG Yu;WU Jiarong;HAN Yuhang;WU Shuaishuai;JIANG Shixi;LI Kailun;ZHANG Yifan;Li Hongzhi(Xi'an Thermal Power Research Institute,Co.Ltd.,Xi'an,710054,China)
机构地区:[1]西安热工研究院有限公司,陕西西安710054
出 处:《电力科技与环保》2023年第6期465-470,504,共7页Electric Power Technology and Environmental Protection
基 金:国家自然科学基金项目(No.51806172)。
摘 要:超临界二氧化碳压缩机是超临界二氧化碳循环的关键核心设备之一,压缩机入口参数接近临界点,叶轮附近的局部加速现象会引发两相区的出现,这可能会对压缩机的安全稳定运行带来隐患。为了深入认识并找出解决该问题的方法,本文将液滴凝结经典成核和生长模型以离散颗粒模型(discrete particle mode,DPM)的形式嵌入流体计算模型,开发出描述超临界二氧化碳凝结的CFD-DPM数值模拟方法,并验证其可靠性。数值模拟结果表明,该方法模拟出的结果与实验数据相符较好。Laval喷管的渐缩部分工质压力急剧降低,达到了很高的过饱和度状态,穿过亚稳态区进入凝结区域,创造极为有利于凝结的环境,因此二氧化碳工质在这个位置集中凝结,即成核率最大的位置出现在x=-0.012 m位置处,最大值约为2.58×10^(25)个/(m^(3)·s)。在二氧化碳凝结的同时,释放出来的热量使工质状态向亚稳态区域偏移,液滴凝结的驱动力减弱,液滴的成核速率和生长速率减缓。本文提出的CFD-DPM方法具有详细描述凝结液滴演化规律的功能,可应用在超临界二氧化碳压缩机的模拟中,有望展示压缩机叶轮进口的凝结液滴的发展演化规律,为高性能超临界二氧化碳压缩机的设计和优化提供高效手段。The supercritical carbon dioxide(sCO_(2))cycle is a highly promising new power generation system that is expect-ed to replace a portion of conventional steam turbine units in fields such as ship propulsion,offshore platforms,and mo-bile power sources.The sCO_(2) compressor is one of the key core components of the sCO_(2) cycle,and its inlet parameters are close to the critical point.The local acceleration phenomenon near the impeller can lead to the occurrence of two-phase regions,which may threaten the safe and stable operation of the sCO_(2) compressor.In order to gain a deep under-standing of this problem,the classical nucleation and growth models of droplet condensation were embedded in the fluid computational model in the form of a discrete particle model(DPM)in this paper.This developed CFD-DPM numerical simulation method for describing sCO_(2) condensation was validated with good agreement with experimental data.The nu-merical simulation results show that the pressure of the working fluid in the converging section of the Laval nozzle drops sharply,reaching a highly supersaturated state.The CO_(2) passes through the metastable zone and enters the condensa-tion region,creating an environment highly conducive to condensation,resulting in the concentration of carbon dioxide droplets at this location,and the maximum nucleation rate appears at the position of x=-0.012 m,and the maximum val-ue is about 2.58×10^(25)(m^(3)·s)^(-1).Meanwhile as carbon dioxide condenses,the released heat shifts the working fluid state towards the metastable zone,weakening the driving force for droplet condensation and slowing down the nucleation and growth rates of the droplets.The CFD-DPM method proposed in this study has the capability to describe the evolution of condensing droplets in detail and can be applied in the simulation of sCO_(2) compressors,aiming to demonstrate the de-velopment and evolution of condensing droplets at the impeller inlet of the compressor.This provides an efficient method for the design and optimizatio
关 键 词:二氧化碳凝结 Laval喷管 数值模拟 离散颗粒模型
分 类 号:TK172[动力工程及工程热物理—热能工程]
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