Four kinds of intermediate casings were tested experimentally

including the original model

optimization model

and two models based on optimization model respectively.The length of the strut's chord and the flow path were changed for the last two models.Inlet and outlet total temperature

inlet and outlet total pressure

static pressure of outer and inner wall

static pressure of middle struct along 50% spanwise were measured by pneumatic intelligent pressure scanner and pressure probe

and the effects of the geometry structure on the intermediate casing's aerodynamic performance were evaluated.The results shows that:increase of the duct's axial distance can improve the performance of intermediate casing;the optimized intermediate casing profile can improve the pressure distribution in inlet and outlet;the inner wall profile has a significant impact on the acceleration and deceleration of flow

and optimized pressure distribution is relatively smooth;the geometry of the struts should be considered in optimization.