为研究燃气轮机过渡段高效气动设计方法，以某型燃气轮机过渡段为研究对象，在给定的气动边界和几何限制条件下，按照过渡段坡角设计、上下端壁型线优化设计、支柱型式选取的思路，采用CFD数值仿真方法，对过渡段气动设计方法进行研究。首先，对比过渡段坡角为14°，19°，24°条件下的过渡段性能及下游动力涡轮比功；然后，对过渡段上、下端壁型线进行优化；最后，对比支柱对过渡段气动性能的影响，采用截面面积由下至上减小和截面面积不变两种型式，根部截面面积保持一致，完成过渡段气动优化设计。结果表明：坡角为19°条件下过渡段气动性能最优；在1.0工况下，相比原型型线优化后的过渡段总压恢复系数由0.994 8提高到0.995 1，静压升系数由2450 4提高到2.595 2，过渡段出口马赫数由0.217 6降低到0.199 5，出口静压分布更为均匀；截面面积由下至上递减的支柱型式过渡段气动性能更优。

In order to study the highefficient aerodynamic design method of transition section of gas turbine, 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 design, profile optimization design of upper and lower end walls and pillar type selection. Firstly, the performance 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 optimized; 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 unchanged for section area, the root section area remains unchanged, so as to complete the transition section 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 section 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 decreasing from bottom to top.

TK472

国家科技重大专项（J2019Ⅱ00090029，Y2019Ⅷ00130174）；中船集团自立科技项目（202109Z）