Influence of Tip Design and Structural Parameters on Aerothermal Performance in High-load Turbine

doi:10.3901/JME.2025.08.283

Abstract

Abstract: To enhance the aerothermal performance of the high-load turbine blade tip and clarify the unclear mechanisms of tip design parameters under complex conditions of the stage environment，a novel design for the rotor blade tip is proposed and a study on the aerodynamic and thermal performance of different blade tips is conducted in a stage environment. It also provides a depth analysis of the mechanisms by which key configuration parameters of the blade tip influence its aerodynamic and thermal performance. The specific researches are as follows: First，two blade tip configurations were established: a vertical shoulder wall design on the pressure side of the squealer tip (Shelf tip) and an inclined shoulder wall design (Incline tip). Secondly，detailed aerodynamic and thermal analyses indicate that compared to the traditional squealer tip design，the Shelf tip shows a 9.24% relative increase in the leakage to mainstream mass flow ratio，a 0.106% reduction in aerodynamic efficiency，and a slight increase in the average heat transfer coefficient. In contrast，the Incline tip reduces the leakage to mainstream mass flow ratio by 6.73%，improves efficiency by 0.155%，and relatively reduced the overall average heat transfer coefficient by 3.90%. Furthermore，investigations into key blade tip configuration parameters revealed that increasing the cavity depth of the blade tip improve the aerodynamic performance for both configurations，but had inconsistent effects on the heat transfer performance. Additionally，increasing the platform width of the configuration only improves the aerodynamic and thermal performance of the Incline tip. In conclusion，a new configuration design for the high-load turbine blade tip has been constructed，revealing the interactive influence mechanism between the cavity depth and the width of the platform and the aerothermal performance of the blade tip in the novel configuration designs. It provides a direction for optimizing the aerothermal performance of the blade tip.

Key words: high-load turbine, rotor tip, structure parameter, performance, heat transfer coefficient

CLC Number:

V232

LI Chenxi, GUO Pengcheng. Influence of Tip Design and Structural Parameters on Aerothermal Performance in High-load Turbine[J]. Journal of Mechanical Engineering, 2025, 61(8): 283-296.

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