便携式呼吸装置高速离心风机的设计与研究

Development and Experimental Research of Small High-speed Centrifugal Fan Based on Portable Respiratory Device

便携式呼吸装置气源需要在毫米级的通流尺寸下实现大范围流量工况的同时,还要保证足够的供气压力。为此对呼吸参数进行分析,确定了采用高速离心风机的结构形式。对于离心叶轮,采用三阶贝塞尔曲线构造中弧线参数化方程,并利用高级拉丁超立方取样法和数值模拟技术构建样本空间;采用响应面以及进化算法,以叶片中弧线的角度分布以及出口安装角度为优化参数,将风机的全压系数和效率作为优化目标进行寻优设计,得到高速风机气动型线。对该结构风机进行样机制造和气动性能测试,得到的性能结果与优化设计性能相符,完全满足了便携式呼吸装置的性能与应用的需求。

The air supply of portable respiratory devices needs to achieve a wide range of flow conditions in millimeter-scale flow size and ensure sufficient supply pressure.This paper analyzes the respiratory parameters and determines the structure of the high-speed centrifugal fan.For the centrifugal impeller,the middle arc parametric equation is constructed by the third-order Bessel curve,and the sample space is constructed by the advanced Latin hypercube sampling method and numerical simulation.The response surface and the evolutionary algorithm are used to optimize the angle distribution of the arc line in the blade and the installation angle of the outlet.The total pressure coefficient and efficiency of the fan are taken as the optimization objectives to optimize the design,and the aerodynamic profile of the high-speed fan is obtained.The prototype manufacturing and aerodynamic performance test of the structure fan are carried out.The performance results obtained are consistent with the optimized design performance,which fully meets the performance and application requirements of the portable respiratory device.