The employed S-shaped polynomial curves as the basis of the gooseneck of compressor geometric modeling. The method used the relative location of S-shaped inflection point of inner wall curve

the peak point and its value of the area distribution rate to control the gooseneck geometrics modeling. A series models were constructed from the baseline gooseneck modeling to analyze with 3-D numerical simulation. The results indicate that the peak value of area distribution rate has the most important effects on the total pressure loss of gooseneck. An relative Mach number can be obtained by changing the peak value of area distribution in order to reduce the flow separation near the outer wall and after the struts.Meanwhile inner walls with large curvature near the entrance of gooseneck modeling

and area distributions rate with an appropriate position of peak point can improve the streamline of outer wall. For example

the total pressure loss of gooseneck reached its minimum at relative location of inflection point of inner wall of 0.18

and relative location of peak point of area distribution rate of 0.20 at relative Mach number of 0.65.