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Numerical Investigation of a Turbine Stator with nonaxisymmetric endwall Profiling

Journal of Thermal Science 2022年第5期31卷 1790-1803页

作者： LIU Wei WANG Songtao WEN Fengbo School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150001China

nonaxisymmetric endwall is an effective method to reduce secondary loss and improve aerodynamic *** this paper,a nonaxisymmetric endwall automated optimization process based on the nonuniform rational B-spline surface(NURBS)technique was *** technique was applied for the aerodynamic optimization of the turbine stator shroud endwall to reduce total pressure loss and secondary kinetic *** flow fields of the datum endwall design(Datum)and optimization endwall design(Opt)were investigated and *** loss analysis was performed with a loss breakdown *** entropy generation was classified as profile loss,secondary loss and trailing edge loss,all of which were *** secondary loss was much smaller than the profile *** general,the blade row total entropy loss decreased by 11.7%.The results showed that the Opt design reduced total pressure loss and coefficient of secondary kinetic energy by 11.1%and 11.0%,*** decrease in secondary kinetic energy could be attributed to the reduction in the horseshoe vortex and the reduced transverse pressure *** the outlet Mach numbers and inlet incidence angles vary,the performance of the profiled endwall design was always better than the datum *** the turbine stage simulation,the efficiency was increased by 0.28%with nonaxisymmetric endwall.

关键词： turbine optimization nonaxisymmetric endwall entropy loss

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