紧凑型超临界CO_(2)机组转子设计与动力学分析

Rotor Design and Dynamic Analysis of a Supercritical Carbon Dioxide Compact Turbomachinery

当前世界能源格局正在进行巨大的改变。随着风电、光伏等间歇性、不可调度的可再生能源发电占比不断提升,电网对包括煤电、光热等在内的热-功(电)转换系统提出了更多的灵活性、低碳清洁的要求。超临界二氧化碳(S-CO_(2))热功转换系统具有效率高、系统紧凑以及灵活性好等潜在优点,这些正好与未来能源系统的发展需求有着极高的匹配度。所述小功率紧凑型S-CO_(2)透平压缩机同轴一体机高速转子的设计综合考虑了叶轮气动设计、轴承特性、转子动力学、推力、密封等诸多因素,而这些因素受限于目前工业生产制造水平,往往相互制约,在设计中进行了反复迭代,以得到最优解。转子动力学分析为此类高速转子设计考核的关键。进行了不同建模方法(集中载荷法和分段模型法)以及加载密封参数的研究,得到其对转子动力学关键特性参数的影响。研究成果可为后续的试验以及新产品设计考核提供重要参考。

Following the global conversion on energy,the world energy structure is undergoing tremendous changes.With the continuous proportion increase of intermittent and undispatchable renewable energy power generation,such as wind power and photovoltaic,the power grid is required to have more flexibility,low-carbon and cleanliness for heat-to-power(electricity)conversion systems including coal power,solar thermal,etc.Supercritical carbon dioxide(S-CO_(2))thermal power conversion system has potential advantages,such as high efficiency,compact system and good flexibility,which exactly meet the development of the future energy system.In the design of the high-speed rotor of the small-power compact S-CO_(2)turbo-compressor coaxial integrated machine,many factors have been taken into consideration,such as impeller aerodynamic design,bearing characteristics,rotor dynamics,thrust and sealing characteristic.Because the factors are often restricted and limited by the current capabilities of industrial production and manufacturing,it is necessary to iterate repeatedly in the design to get the optimal solution.Rotor dynamics analysis is the key to the design and assessment of such high-speed rotors.Different modeling methods(concentrated load method and segmented model method)and loading sealing parameters have been studied,and their influence on the key characteristics of rotor dynamics parameters has been obtained.The research result can provide important reference for subsequent tests and new product design and assessment.