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The high-order accurate finite-difference method is used to simulate the hypersonic flow field around a blunt wedge under the condition of the wall roughness element. The influence of the position of the independent wall roughness element on the interaction between the free flow and the wall is analyzed, and the influence of the position of the roughness element on the wall pressure, the wall friction resistance and wall heat flow are studied. The results show that two compression waves and one expansion wave are formed in the flow field by rough elements, and the wave intensity increases when the position of rough elements move forward. When the center of the rough element is xp≥1.5, a vortex will form at the leading edge of the rough element. The backward moving of the rough element will increase the length of the vortex, inhibit the change of the flow parameters in the first-half of the rough element, promote the change of the flow parameters in the second-half of the rough element, which will reduce the wall friction resistance and inhibit the heating of the incoming flow to the first-half of the rough element.
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