叶片气动特性对局部型线导数变化的敏感性

Sensitivity of Blade Aerodynamic Characteristics to the Variations of Local Profile Derivative

叶片气动特性对其形状参数变化有一定的敏感性。本文将影响翼型气动性能的几何因素归结为局部型线一阶导数、二阶导数的变化程度问题,以S809翼型为研究对象,对其局部进行一定的几何形状设计,基于本课题组开发的UCFD计算程序,对相应工况下的气动情况进行模拟,系统研究不同气动条件下叶片的气动特性对局部型线一、二阶导数的变化程度的敏感性程度,找出他们之间客观规律。结果表明:叶型型线一、二阶导数的变化都会对气动性能产生显著影响,且影响程度与导数变化程度正相关;某些特定位置对一、二阶导数的变化敏感性较强。

The aerodynamic characteristics of blade are of certain sensitivity to its shape factor variations.Summarized these shape factors to the variation of local profile derivatives,the detailed numerical simulation based on the CFD program has been carried out on S809 airfoil under certain operating conditions,and the sensitivity of airfoil performance to the variations of first and second derivative of the airfoil profiles and the objective law among them are systematically researched.The result shows that the variations of both local first and second order derivative of the airfoil profiles can impact the performance,and the influence degree is positively correlated with the degree of derivative variation.Some certain positions on the airfoil are of stronger sensitivity to the derivative variations.