Aerodynamic Optimization Design for Transition Section of Gas Turbine
In order to study the high-efficient aerodynamic design method of transition section of gas tur-bine,taking the transition section of a certain gas turbine as the research object,under the condition of given aerodynamic boundary and geometric constraints,CFD numerical simulation method was adopted to study the aerodynamic design for gas turbine transition section according to the ideas of slope angle de-sign,profile optimization design of upper and lower end walls and pillar type selection.Firstly,the per-formance of transition section and the specific power of downstream power turbine were compared under 14°,19°and 24°slope angles;then,the upper and lower wall profiles of the transition section were opti-mized;finally,the influence of two types of pillars on the aerodynamic performance of transition section was compared,adopting two kinds of states,such as decreasing from bottom to top and remaining un-changed for section area,the root section area remains unchanged,so as to complete the transition sec-tion aerodynamic optimization design.Results indicate that when the slope angle is 19°,the aerodynamic performance of transition section is best;the total pressure recovery coefficient of optimized transition sec-tion increases from 0.994 8 to 0.995 1,the static pressure rise coefficient increases from 2.450 4 to 2.595 2,and the outlet Mach number decreases from 0.217 6 to 0.199 5 compared with the prototype profile under the working condition of 1.0.The outlet static pressure distribution is more uniform;the aerodynamic performance of the transition section with the pillar type is better under the section area de-creasing from bottom to top.
gas turbinetransition sectionslope angleprofilepillaraerodynamic optimization design
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