Effect of High Performance Turbine Blade Curved-Twisted-Swept Modification on Flow Field
In order to explore the applicability and difference of blade bending,twisted and sweep modification in high-load turbines,this paper takes the last stage of the 300 MW F-class heavy-duty gas turbine as the research object,and uses orthogonal optimization and sensitivity analysis.The method explores the influence of bending,twisted and sweep on the flow field by means of numerical simulation.Due to the influence of turbine stator blade modification on the aerodynamic matching of the rotor and stator blades,this study investigates the aerodynamically best-matched rotor blade twist modification for each type of stator blade modification.The study shows that the best bending form of the stator blade is the reverse bending at both ends and the positive bending in the middle.This bending form can improve the flow condition at the end of the stator blade,weaken the secondary flow intensity in the cascade channel,and increase the turbine's wheel efficiency by 0.86％.The twisted modification of the stator blade has a great influence on the turbine,and the turbine wheel efficiency is increased by 2％,but the turbine flow coefficient decreases more.When using the twisted modification to improve the turbine performance,it is necessary to pay attention to the negative impact of the excessive twisted angle on the turbine performance.Compared with the bending and twisted modification,the influence of the stator swept modification on the aerodynamic performance of the turbine is relatively weak.The research results provide guidance for the design of high performance turbine blades.
heavy-duty gas turbinecurved twisted Swept bladeorthogonal optimizationsec-ondary flowsensitivity analysis
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