双三角翼拉升流场特性数值模拟研究

摘要

Numerical methods suitable for computing the unsteady separated flow around a double-delta wing at large angles of attack are developed in this paper, and the dynamic characteristics of the flow fields during pitch-up motion is studied. The physical mechanism of the dynamic flow performance, caused by variations of three motion parameters such as the reduced frequency, the position of rotation axis and the initiative angle of attack, is carefully investigated. It is of much benefit to understand the un- steady characteristics when a double-delta wing pitches up and the nonlinear phenomena of the flow field with lag effect.%发展了适用于双三角翼大攻角非定常分离流场模拟的数值方法，开展双三角翼拉升运动的动态流场特性研究。通过减缩频率、转轴位置和起始攻角的变化，仔细分析了这些运动参数对动态流场施加影响的物理机制，有利于提高对双三角翼在拉升条件下的非定常特性和流场滞后效应等非线性现象的认识。