摘要
氦气压气机是高温气冷实验堆氦气透平发电系统的关键部件,其气动性能直接影响系统发电效率。氦气压气机径向间隙和轴向间隙对其气动性能有重要影响。该文以氦气压气机模型级为研究对象,采用试验验证过的数值计算方法,研究了叶顶间隙与轴向间隙对压气机气动性能的影响和机理。分析结果表明:减小叶顶间隙会减小泄漏流、回流、二次流,能够提高压气机的压比和效率,当间隙小于0.3mm(叶高的2%)时尤其明显;动叶的偏离设计点的轴向移动会降低压气机的效率,可允许的轴向间隙变化范围为±1.0mm。该研究结果揭示了叶顶间隙与轴向间隙对模型级的影响,可为氦气压气机整机气动性能的研究与优化提供依据。
The helium compressor is one of the key components in the high temperature gas-cooled reactor coupled with a helium turhine. The aerodynamic performance of the helium compressor significantly influences the whole system efficiency. Therefore, the effects of the tip and axial clearances on the helium compressor need to he further studied and optimized. A computational fluid dynamics model that has been verified against experimental data of the helium compressoris used to investigate the influence of the tip and axial clearances. The results show that a reduced tip clearance reduces the flow losses and increases the compression ratio and compressor efficiency, especially for clearances of less than 0.3 mm （2% of the relative blade height）. A larger axial clearance lowers the compressor efficiency with an acceptable axial displacement of ± 1.0 mm. The results show the influences of the tip and axial clearances on the model, and provide guidance for the design and optimization of the actual helium compressor.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第8期832-837,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家科技重大专项(2011ZX06901-019)
国家"八六三"高技术项目(2005AA511010)
关键词
高温气冷堆
氦气压气机
叶顶间隙
轴向间隙
气动性能
high temperature gas-cooled reactor
helium compressor
tip clearances
axial clearances
aerodynamic performance
