小容积流量下船用核湿汽轮机末级流场稳定性分析

Stability Analysis of Final-Stage Flow Field in Low Volume Flow Working Conditions for Marine Nuclear Wet Steam Turbine

采用Bladegen软件对核湿汽轮机末级扭叶片进行参数化建模,并基于Turbogrid软件完成复杂扭叶片单流道的准确建模和网格划分;采用CFX软件对变容积流量工况下的核湿汽轮机末级进行全三维定常数计算及分析。结果表明,核湿汽轮机末级通流域内的流动稳定性随相对容积流量的减小而逐渐下降;级内蒸汽流动较为复杂,70%~85%叶高区域处的流场紊乱度最大且稳定性最差。本研究为该型核湿汽轮机的结构和叶型优化提供借鉴意义。

Bladegen software is used to parameterize the solid twisted blade,and Turbogrid software is used to complete the accurate modeling and meshing of the complex twisted blade single.The final stage of the nuclear wet steam turbine in variable volume flow condition were calculated and analyzed by CFX software.The results show that the flow stability in the final stage of the wet steam turbine gradually decreases as the relative volume flow decreases.Steam flowing in the stage exhibits extremely complex rules,and in the 70%?85%leaf of height area,the flow field is the biggest and the stability is the worst.The research conclusion provides a reference for the future optimization of the structure and the blade shape of the steam turbine,and further improves the stage flow capacity.