超临界二氧化碳向心透平流动损失分解及损失特性研究

打开文本图片集

中图分类号：TK47 文献标志码：A

DOI： 10.7652/xjtuxb202510009 文章编号：0253-987X（2025）10-0096-10

Research on Flow Loss Decomposition and Loss Characteristics of Supercritical Carbon Dioxide Centripetal Turbine

LIU Ruyi1，DIAO Anna²，CHI Zhinan²，ZHANG Shuaizhao¹ ， DENG Qinghual，LI Jun1 ，FENG Zhenpingl （1.School of Energy and Power Engineering，Xi'an Jiaotong University，Xi'an 71oo49，China; 2.Shanghai Marine Diesel Engine Research Institute，Shanghai 2Ollo8，China）

Abstract： To address the unclear coupling mechanism of flow losses and the lack of optimization direction in supercritical carbon dioxide （ SCO2 ） centripetal turbines，a 150kW （20 SCO2 centripetal turbine is concentrated in this paper. Based on entropy generation theory，different boundary condition settings，multiple numerical simulations，and vorticity analysis methods are employed to decompose flow losses，identify loss sources， and analyze loss characteristics. The simulation results indicate that under design conditions，the flow losses in the centripetal turbine occur in the following order， from largest to smallest： leakage losses， stator losses，mixing losses，and rotor losses，accounting for 44.43% ， 31.82% ， 11.98% ，and 11.77% of the total losses，respectively.When deviating from the design conditions， the proportions of leakage losses and stator losses decrease，while the proportion of mixing losses increases，with little change in rotor losses. The primary cause of leakage losses is the relatively high clearance at the inlet tip of the rotor，which leads to significant leakage through the turbine；reducing the blade tip clearance can notably decrease the turbine's entropy generation and leakage losses. Stator losses predominantly occur in the mid-to-late regions of the passage，while rotor losses increase sharply at the mid-section of the rotor. The findings provide data support for the aerodynamic design and profile optimization of 100kW. -class SCO2 power cycle centripetal turbines.

Keywords： supercritical carbon dioxide； radial inflow turbine；decomposition of flow losses; entropy generation theory

由于超临界二氧化碳（ SCO2 ）动力系统在提升循环效率与减小动力部件体积方面具有巨大优势，近年来在学术及工程领域均受到了极大关注，已成为学术研究热点之一[1-3]。（剩余14916字）