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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 leaves have some sensitivity to the change of their shape parameters. In this paper, the geometrical factors that affect the aerodynamic performance of the airfoil are summarized as the first derivative of the local profile and the degree of variation of the second derivative. With the S809 airfoil as the research object, some geometric shapes are designed locally. Based on the development of this project group The UCFD calculation program is used to simulate the aerodynamic conditions under the corresponding conditions. The sensitivity of the aerodynamic characteristics of the blades to the degree of change of the first and second derivatives of the local profile under different aerodynamic conditions is systematically studied to find out the objective laws . The results show that the change of the first derivative and the second derivative of the leaf profile have a significant effect on the aerodynamic performance, and the degree of influence is positively correlated with the degree of the derivative change. Some specific positions are more sensitive to the changes of the first derivative and the second derivative.