离心透平附属通流部件设计分析

Design of the Auxiliary Flow Components of the Centrifugal Turbine

离心透平的通流部件主要包括:进气道、静叶栅、动叶栅、无叶扩压器、出气道,本文对除静叶栅、动叶栅之外的附属通流部件的子午面进行设计。进气道子午面设计采用等截面法,保证级前进气均匀、轴向对称;无叶扩压器采用与叶栅等高的平行侧壁形式,最佳出口直径根据整机效率最优的原则得到;出气道子午面采用与叶栅等高的圆弧扩压弯管设计。结果表明,该方法设计附属通流部件简单易行,特别适合工程应用,以某一离心透平为例,数值模拟得到的级效率为88.51%,整机效率为90.34%,轮周功为478.9 kW,性能达到预期。

Centrifugal turbine flow components mainly includes：inlet,stator and rotor cascade,vaneless diffuser,outlet.In this paper,the meridian plane design of the throughflow sections without the stator and rotor cascade had been analyzed.The design of inlet meridian plane obey the uniform section method,which can ensure air enters uniformly and axial symmetry;the vaneless diffuser meridian plane side was parallel,and the optimal outlet diameter according to the principle of the optimal overall efficiency;the outlet meridian plane adopt the contour of the circular bending pipe.With a centrifugal turbine as an example,which throughflow sections are designed by using this method,the stage efficiency is 88.505%and machine efficiency was up to 90.34%and wheel power was478.9 kW obtained by numerical simulation,the performance in line with expectations.The results show that using this method to design auxiliary flow components is simple,specially suitable for the engineering application.