Effect of Conjugate Heat Transfer on the Performance of Rotating Components in Ultra-Micro Gas Turbines

YAO Xuerui; XU Mengjuan; LIU Zhao; FENG Zhenping

doi:10.7652/xjtuxb202610013

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Effect of Conjugate Heat Transfer on the Performance of Rotating Components in Ultra-Micro Gas Turbines

Special Topic Thermal-Fluid Analysis and System Optimization | 更新时间：2026-09-29

- Effect of Conjugate Heat Transfer on the Performance of Rotating Components in Ultra-Micro Gas Turbines
- Journal of Xi'an Jiaotong University Vol. 60, Issue 10, Pages: 148-159(2026)
- 作者机构：
  
  西安交通大学能源与动力工程学院，710049，西安
  西安交通大学机械工程学院，710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202610013
  CLC： TK47
- Received：14 February 2026，
  
  Online First：16 April 2026，
  
  Published：10 October 2026
- 稿件说明：
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YAO Xuerui, XU Mengjuan, LIU Zhao, et al. Effect of Conjugate Heat Transfer on the Performance of Rotating Components in Ultra-Micro Gas Turbines[J/OL]. Journal of Xi'an Jiaotong University,2026,60 (10):148-159. https://doi.org/10.7652/xjtuxb202610013.
DOI：

YAO Xuerui, XU Mengjuan, LIU Zhao, et al. Effect of Conjugate Heat Transfer on the Performance of Rotating Components in Ultra-Micro Gas Turbines[J/OL]. Journal of Xi'an Jiaotong University,2026,60 (10):148-159. https://doi.org/10.7652/xjtuxb202610013. DOI：

摘要

为揭示超微型燃气轮机转子内部轴向传热对旋转部件气动性能的影响机制，并评估内部冷却结构对转子性能的恢复作用，采用流热耦合方法对一台350W超微型燃气轮机转子开展流动与传热的数值模拟，对比分析了内部传热及轴内冷却对部件性能的影响。结果表明：内部传热使离心压气机压比下降5.71%，效率降低5.17%，向心透平输出功率下降10.96%，效率降低2.48%，但传热同时在一定程度上稳定了压气机与透平内部的流动结构，减小了流动损失。施加内部冷却结构后，压气机压比与效率分别提升1.13%与0.98%，透平输出功率升高2.90%，效率提高0.10%，悬臂轴温度降幅达45.10%。基于传热带来的流动稳定效应，提出在设计中适当采用更高叶片载荷的设计思路以补偿因传热导致的做功能力衰减。内部冷却结构能有效降低悬臂轴温度，改善轴承工作环境，为超微型燃气轮机在紧凑条件下的长期稳定运行提供有效的热防护方案。

Abstract

To reveal the mechanism by which internal axial heat transfer within the rotor affects the aerodynamic performance of rotating components in ultra-micro gas turbines

and to evaluate the restorative effect of an internal cooling structure on rotor performance

numerical simulations of flow and heat transfer in a 350Wultra-micro gas turbine rotor were conducted using a conjugate heat transfer approach. The effects of internal heat transfer and internal shaft cooling on component performance were comparatively analyzed. The results indicate that internal heat transfer reduced the pressure ratio of the centrifugal compressor by 5.71% and its efficiency by 5.17%

and decreased the output power of the radial inflow turbine by 10.96% and its efficiency by 2.48%. However

heat transfer also stabilized the internal flow structures within the compressor and turbine to a certain extent

thereby reducing flow losses. Following the implementation of the internal cooling structure

the pressure ratio and efficiency of the compressor increased by 1.13% and 0.98%

respectively

while the output power and efficiency of the turbine increased by 2.90% and 0.10%

respectively. Furthermore

the temperature of the cantilever shaft was reduced by 45.10%. Based on the flow-stabilizing effect induced by heat transfer

a design approach of appropriately adopting higher blade loading is proposed to compensate for the degradation in work output caused by heat transfer. The internal cooling structure effectively reduces the cantilever shaft temperature and improves the bearing operating environment

thereby providing an effective thermal protection scheme for the long-term stable operation of ultra-micro gas turbines under compact conditions.

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