某径向透平膨胀机可调喷嘴气动及结构设计

Aerodynamic and structural design of rotatable blade nozzle for a radial turbine

中文关键词: 径向透平  可调喷嘴  数值模拟  性能分析  结构设计

英文关键词: radial turbine  rotatable blade nozzle  numerical simulation  performance analysis  structure design

中文摘要:

      针对应用在天然气管网的压力能回收透平，为保证其在不同流量工况下的高效率运行，采用了进气可调喷嘴结构形式，通过气动计算与分析，研究了喷嘴叶型、喷嘴径向尺寸、喷嘴叶轮间隙、旋转轴位置对气动性能的影响。之后采用CFD方法对选定方案进行了不同开度下的性能分析，并进行了可调喷嘴的结构设计。研究结果显示：选定径向尺寸为80。0mm，喷嘴叶轮间隙为15.0mm，旋转轴中心直径为509.6mm时，膨胀机的气动性能与结构均比较合理。研究过程可为透平膨胀机可调喷嘴设计提供参考与指导。

英文摘要:

      The pressure recovery turbine with rotatable blade nozzle is used in natural gas pipe network in order to keep the high efficiency operation under different flow conditions. Through the calculation and analysis of aerodynamic, the effects of nozzle profile, nozzle radial size, clearance between nozzle and impeller, rotating shaft position on the aerodynamic performance were studied. And then the CFD method is used to analyze the performance of the selected scheme under different openings and the structure of rotatable blade nozzle is designed. The results demonstrate that the aerodynamic performance and structure of the expander are reasonable when the radial dimension is 80mm, the nozzle impeller clearance is 15mm, and the center diameter of the rotating shaft is 509.6mm. The research process can provide reference and guidance for the design of adjustable nozzle used for expander.