热力发电2025，Vol.54Issue(12)：9-18,10.DOI:10.19666/j.rlfd.202505108
叶栅内H2O/CO2混合工质非平衡凝结流动损失特性研究
Characterization of non-equilibrium condensate flow loss of H2O/CO2 mixed working fluids in cascade
摘要
Abstract
Supercritical water coal gasification for hydrogen production is a clean and efficient power generation technology.Based on entropy generation theory,numerical investigation on the non-equilibrium condensation flow of an H2O/CO2 mixed working fluid in the final-stage cascade is conducted.The losses are quantified by identifying regions within the cascade where different types of losses occur and calculating the entropy generation in each region.The mechanisms behind the impact of back pressure and CO2 mass fraction in the mixed fluid changes on various losses and entropy generation sources are analyzed.The effects of these parameters on the loss distribution are explored,including a detailed description of how shock waves influence wake losses and the entropy generation distribution within the boundary layer.The results show that wall losses,wake losses,and boundary layer losses consistently account for over 90%of the total losses under different operating conditions.The main sources of entropy generation are wall dissipation,direct dissipation,and turbulence dissipation.When the back pressure increases by 5.03 kPa,the total loss decreases by 31.73%.However,when the CO2 mass fraction in the mixed fluid increases by 40%,the total loss increases by 4.71%.The variation in turbulent dissipation entropy generation within the wake loss is the primary cause of the total loss change and is closely linked to the velocity gradients in the flow field.This study offers significant insights for the loss analysis of the wet steam region in mixed medium steam turbines and for aerodynamic optimization.关键词
H2O/CO2混合工质/非平衡凝结/熵产理论/损失分析Key words
H2O/CO2 mixed working fluid/non-equilibrium condensation/entropy production theory/loss analysis引用本文复制引用
HAN Zhonghe,WU Xuwei,HAN Xu,YAO Bochuan,SHI Haibo..叶栅内H2O/CO2混合工质非平衡凝结流动损失特性研究[J].热力发电,2025,54(12):9-18,10.基金项目
河北省自然科学基金项目(E2023502025) （E2023502025）
河北省高等学校科学研究项目青年拔尖项目(BJ2025053) （BJ2025053）
中央高校基本科研业务费项目(2024MS145)Natural Science Foundation of Hebei Province(E2023502025) （2024MS145）
Young Top-notch Project of Scientific Research Program of Higher Education Institutions in Hebei Province(BJ2025053) （BJ2025053）
Fundamental Research Funds for the Central Universities(2024MS145) （2024MS145）
