超临界二氧化碳压缩机性能不确定性量化研究  

Uncertainty Quantification of Performance of Supercritical Carbon Dioxide Compressor

作　　者：马灿 代路 吕伟剑[1,2] 张克龙 MA Can;DAI Lu;LYU Weijian;ZHANG Kelong(Science and Technology on Thermal Energy and Power Laboratory,Wuhan 430205,China;Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)

机构地区：[1]热能动力技术重点实验室,湖北武汉430205 [2]武汉第二船舶设计研究所,湖北武汉430205

出　　处：《原子能科学技术》2023年第9期1782-1789,共8页Atomic Energy Science and Technology

基　　金：国家自然科学基金(52006156,U2241261);湖北省自然科学基金(2019CFA024,2018CFB317)。

摘　　要：压缩机是超临界二氧化碳(S-CO_(2))动力循环中的关键装置,其进气参数通常接近流体的临界点,进气参数的微小变化会引起流体物性的剧烈变化,从而影响压缩机性能。本文采用一维模型和三维CFD方法对某S-CO_(2)压缩机进行了数值研究,一维模型预测得到的效率、压比与三维CFD计算结果存在明显差异。基于三维CFD计算结果,采用多项式混沌展开方法对压缩机进口总温随机波动引起的气动性能不确定性进行了量化研究。结果表明,进口总温的微小变化造成了压缩机流量和等熵效率的显著变化,在压缩机的设计中有必要考虑提高进气参数不确定性的稳健性。The supercritical carbon dioxide(S-CO_(2))based power cycle is very promising for its potentially higher efficiency and compactness compared with steam-based power cycle.Compressor is the critical component of the S-CO_(2) based power cycle.The inlet flow state of the S-CO_(2) compressor is typically set close to the critical point of the fluid.As a result,small variations in the inlet flow state during operation might cause significant variations in fluid properties,which have an impact on the compressor aerodynamic performance.Therefore,it is necessary to investigate the influence of inlet flow state uncertainty on the compressor performance.In this work,the numerical simulation of an S-CO_(2) compressor was carried out with both the meanline model and the three-dimensional computational fluid dynamics(CFD)method.The efficiency and the pressure ratio with the meanline model show obvious difference with the CFD results.The accuracy of the meanline model relies on verified empirical correlations.As the existing empirical correlations in open literature and commercial software are typically derived from air compressor test data,due to the lack of S-CO_(2) compressor test data,the accuracy of the meanline model in the existing commercial software for the S-CO_(2) compressor has not been systematically verified.Compared with the meanline model,the three-dimensional CFD simulation is based on a more accurate geometric model and the flow model is less simplified.Therefore,based on the more time-consuming CFD results,the uncertainty quantification of the aerodynamic performance of the S-CO_(2) compressor with stochastic inlet total temperature variations was carried out using the arbitrary polynomial chaos(aPC)expansion.The aPC method performs polynomial chaos expansion based on the statistical moments of the data and is suitable for both continuous distributions and discrete data sets of uncertain variables.For the case in this work,when using the 4th order aPC expansion,the relative error of the efficiency variance i

关 键 词：超临界二氧化碳压缩机 不确定性量化 多项式混沌展开 

分 类 号：TL33[核科学技术—核技术及应用] TK472[动力工程及工程热物理—动力机械及工程]