Recently, an inverse design method called the ball spine algorithm (BSA) is introduced to design S-duct diffusers with elliptic cross-sections. The technique is developed for the 3-D design of S-shaped ducts with special cross-sectional profiles in the present work. The upper and lower lines of the S-duct symmetric section are modified under the BSA. Two types of special cross-section profiles are used to improve the aerodynamic properties of the duct. At the S-duct inlet, the super-ellipse profile is used to minimize the duct inlet height. At the aft part of the duct, the egg-shaped profile is predefined to decrease the pressure difference between the upper and lower lines and to diminish the adverse pressure gradient along the upper line. Finally, the flow through the designed S-duct is numerically analyzed using a viscous flow solver with the SST turbulence model to validate the designed S-duct performance.

最近，引入了一种称为球脊算法（BSA）的逆向设计方法来设计具有椭圆横截面的 S 形管道扩散器。该技术是为目前工作中具有特殊横截面轮廓的 S 形管道的 3D 设计而开发的。在 BSA 下修改了 S-duct 对称截面的上下线。两种类型的特殊截面轮廓用于改善管道的空气动力学特性。在 S 形管道入口处，超椭圆轮廓用于最小化管道入口高度。在管道的后部，预先定义了蛋形轮廓，以减少上下线之间的压力差，并减少沿上线的不利压力梯度。最后，