热力发电2023，Vol.52Issue(11)：10-19,10.DOI:10.19666/j.rlfd.202302016
超临界二氧化碳离心叶轮耦合优化设计
Coupling optimization of supercritical carbon dioxide centrifugal impeller
摘要
Abstract
Self-recirculation casing treatment can significantly improve the aerodynamic performance of the supercritical carbon dioxide centrifugal impeller in small flow rate region,but the improvement is not obvious near the large flow rate region.Therefore,the coupling effect between the self-recirculation casing treatment and the key parameter of the impeller is considered,and the coupling optimization of the casing treatment geometry and the impeller blade sweep angle is carried out to achieve a comprehensive improvement of the impeller performance.After the coupling optimization,the efficiency of the impeller is increased by 3.51％,2.60％and 4.43％respectively under the large flow rate condition,the design condition and the small flow rate condition.The mechanisms of the coupling optimization for stability and efficiency enhancements are as follows.Under the large flow rate condition,the flow incidence angle of impeller is improved,the subcritical zone inside the impeller is reduced,then the condensation is suppressed and the flow capacity of the impeller is improved.Under the design condition,the recirculation flow of casing treatment is increased,more low-energy fluid near the shroud tip is removed,and the flow field structure downstream of the impeller is improved.Under the small flow rate condition,the internal blockage of the impeller is effectively reduced,the flow stability of the impeller is enhanced,and the mixing loss caused by the recirculation flow is improved,so the impeller efficiency is improved.关键词
离心叶轮/超临界二氧化碳/自循环机匣处理/耦合优化Key words
centrifugal impeller/supercritical carbon dioxide/self-recirculation casing treatment/coupling optimization引用本文复制引用
鲁雪,李孝检,刘彬..超临界二氧化碳离心叶轮耦合优化设计[J].热力发电,2023,52(11):10-19,10.基金项目
国家自然科学基金项目(12102298) （12102298）
中国博士后科学基金(2021M702443) （2021M702443）
内燃机燃烧学国家重点实验室开放课题(K2022-09)National Natural Science Foundation of China(12102298) （K2022-09）
China Postdoctoral Science Foundation(2021M702443) （2021M702443）
State Key Laboratory of Engines(Tianjin University)(K2022-09) （Tianjin University）
