论文部分内容阅读
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 a key component of the helium turbine power generation system of a high-temperature gas-cooled reactor and its aerodynamic performance directly affects the power generation efficiency of the system. The helium compressor radial clearance and axial clearance have important influence on the aerodynamic performance. In this paper, the model level of helium compressor is taken as the research object. The numerical calculation method verified by experiments is used to study the influence and mechanism of tip clearance and axial clearance on the aerodynamic performance of the compressor. The results show that reducing the tip clearance reduces the leakage, backflow and secondary flow, which can improve the pressure ratio and efficiency of the compressor, especially when the clearance is less than 0.3mm (2% of the leaf height) Axial displacement away from the design point will reduce the efficiency of the compressor with a permissible variation of axial clearance of ± 1.0 mm. The results of this study reveal the effect of tip clearance and axial clearance on the model level, which can provide the basis for the research and optimization of the aerodynamic performance of the helium compressor.