大膨胀比对转式离心透平设计

为了设计高效、轻便、紧凑的叶轮机械,根据对转式离心透平的结构特点,选定9个独立初始设计变量,对大膨胀比对转式离心透平进行一维气动设计。采用中弧线叠加厚度方法进行高压静叶和低压动叶的叶片造型,通过压力面和吸力面单独造型完成缩放流道式高压动叶叶片造型,并采用CFX软件对其进行定常数值模拟。结果表明:大膨胀比对转式离心透平的流量、轮周效率及输出轴功均合理,各项气动设计值与一维设计值的误差均在3%以内,与所参考的两级离心透平相比,对转式离心透平效率提高了2.35%,径向尺寸减小了4.42%。

Design of Counter Rotating Centrifugal Turbine with Large Expansion Ratio

In order to design an efficient, light and compact turbomachinery, according to the structural characteristics of the counter rotating centrifugal turbine, nine independent initial design variables were selected, and one dimensional aerodynamic design of the counter rotating centrifugal turbine with large expansion ratio was carried out. The blade profiling of high pressure stator blade and low pressure rotor blade was carried out by means of superposition thickness of middle arc line, and the blade profiling of the high pressure rotor blade with the scalable flow channel was completed by the separate modeling of the pressure surface and the suction surface, and the steady numerical simulation was carried out by using CFX software. The research results show that the flow rate, wheel efficiency and output shaft power of the counter rotating centrifugal turbine with large expansion ratio are reasonable, and the errors of each aerodynamic design value and one dimensional design value are both in the range of 3%. Compared with the referenced two stage centrifugal turbine, the efficiency of the counter rotating centrifugal turbine is increased by 2.35%, and the radial dimension is reduced by 4.42%.