In the process of the design, two curved surfaces are intersected to make the scarf lip which the thickness varies;new center line and area regularity (duct curvature and cross Section) are created.

• 设计中采用变厚度唇口技术，两曲面相贯构造斜切进口技术，并对前人提出的扩压器中心线方程和面积变化规律进行了改进。