The aerodynamic characteristics of turboprop aircraft are greatly affected by the running propellers. In this paper, propeller slipstream effects on the static lateral-directional stability characteristics of a typical twin-engine turboprop aircraft with clockwise rotating propellers were investigated through unsteady computational fluid dynamics (CFD) simulations and wind tunnel experiments. The propeller slipstream led to a significant decrease in the lateral static stability contribution of the wing-body-nacelle (WBN), and the most affected wing sections were located near the left boundary of the port propeller slipstream region. Moreover, the influence of the propeller slipstream on the lateral static stability contribution of the vertical tail plane (VTP) significantly altered the rolling moment curve slope of the entire airframe. Due to the effects of the propeller slipstream on the local dynamic pressure and therefore the effectiveness of the VTP, the aircraft showed significantly different directional static stability behaviors between the positive and negative sideslip conditions. Furthermore, it was found that the configurations with clockwise rotating propellers readily experience dramatic losses in directional static stability at large negative sideslip angles.

涡轮螺旋桨飞机的气动特性受运行的螺旋桨影响很大。在本文中，通过非定常计算流体动力学（CFD）模拟和风洞实验研究了螺旋桨滑流对具有顺时针旋转螺旋桨的典型双发涡轮螺旋桨飞机的静态横向稳定性特性的影响。螺旋桨滑流导致翼体短舱（WBN）的横向静稳定性贡献显着降低，受影响最大的机翼部分位于左舷螺旋桨滑流区域的左边界附近。此外，螺旋桨滑流对垂直尾翼（VTP）横向静稳定性贡献的影响显着改变了整个机身的横摇力矩曲线斜率。由于螺旋桨滑流对局部动压的影响以及 VTP 的有效性，飞机在正侧滑和负侧滑状态之间表现出明显不同的方向静态稳定性行为。此外，发现顺时针旋转螺旋桨的配置在较大的负侧滑角下容易遭受方向静态稳定性的巨大损失。