进口受控非定常来流同振荡叶栅相互作用的Euler方程数值解

将 Dcnton 的四角点有限面积格式用于求解变换坐标系下的非定常 Euler 方程组,在振荡叶片附近局部子域构造了一种按等差级数分布的动态网格,从而节省了计算时间,对于本方法的正确性进行了初步检验并与相应的实验进行了对比,在进口总压简谐振荡的束流条件下,计算了零安装角平板叶栅和53°安装角双凸叶栅扭转振荡的非定常流场,结果表明,进口受控扰动同振荡叶栅之间的相互作用在有压力梯度的情况下可以定性地改变叶栅的气动阻尼。

NUMERICAL EULER SOLUTION FOR THE INTERACTION BETWEEN OSCILLATING CASCADES AND FORCED INLET UNSTEADINESS

The unsteady Euler Eqs. are differenced by using Denton's finite area scheme in the transformed system. In local subregions near the oscillating blades, the moving grids with an equal-difference distribution are made up, which results in a higher computation efficiency.The present method is checked by calculating a measured oscillating cascade. Under the harmonic perturbations of the inlet flow, it can be found by the computation that the interaction between the inlet perturbation and oscillating blades may qualitatively change the aerodynamic damping of blades in some conditions.