翼型及钝体的气动导纳

自20世纪60年代Davenport提出钝体气动导纳概念之后,气动导纳一直是钝体空气动力学研究的焦点之一.本文通过大量风洞试验,研究了湍流场中NACA0012翼型和七种典型钝体截面的非定常气动力,试验中首次采用同步脉动压力测量技术,气动导纳的识别采用统计理论.试验得到如下两个主要结论:对于某一给定的几何断面,非定常气动力与湍流各脉动分量存在着不同的气动导纳:流线型体的气动导纳对攻角变化较敏感,而对钝体的影响不太明显.

Aerodynamic admittance of airfoil and bluff bodies

The aerodynamic admittance has been the main topics of bluff body aerodynamics study since 1960s after Prof. Davenport. This study investigates unsteady aerodynamic forces on airfoil and 7 typical bluff cross sections under turbulent incident flow. The fluctuating pressures are measured by using synchronically acquiring technique. The aerodynamicadmittance is identified by statistical method. The study yields the following findings: For a given cross section, there are different aerodynamic admittances for different wind gust components. The aerodynamic admittance is sensitive to the change of incident angle for a streamlined cross section, but not for the very buff cross section.