Numerical simulation on three-dimensional interaction between curved oblique shock wave and bow shock wave was studied under the condition of small radius of the cylinder. The numerical method validation was carried out by using the typical three-dimensional aerodynamic interference model. The entrance boundary condition of inlet was obtained by the application of patched grid technology and inverse-distance interpolation method. It indicated that three-dimensional feature of the interactions was strong as the curved oblique shock and bow shock intersected at small angle and six types of shock-shock interactions proposed by Edney may exist over the lip along the lateral direction

although the radius of cowl lip was small. Thermal environment induced by the type Ⅲ and type Ⅳ shock-shock interactions was severe. And the shape of the high heat flux region was like a “scar” on the cowl lip. Heat flux of the scar was 4 to 6 times of the reference heat flux under the same flow condition. This may lead to the ablation or structure damage of the cowl lip.