关键词: 压力反问题；双特征线方法；局部压力扰动；几何变形；超声速流动；消波

Abstract: A study of wave incomplete propagation caused by local deformation of supersonic circle section flow was discussed. The study involved three-dimensional intersection， reflection， focusing and dissipation of Mach wave. Applying a proposed wave cancelling technology， the geometrical parameters of boundary were therefore designed for supersonic circle section flow in the presence of a local high/low pressure disturbance. In the process of wave cancelling， the three-dimensional propagation，intersection，focusing and dissipation of pressure wave were explored. The geometrical deformation characteristics of wall were discussed. The coupling effect of pressure wave and wall deformation was studied. And intersecting processes of the pressure waves generated by the multi-disturbance sources were studied. By analyzing the wave cancelling flow field structure， it would be found that there was a three-dimensional propagation form in which the compressed and expanded waves were nested downstream the higher-pressure region. And the arc wall has a focusing effect on the pressure wave. According to the geometric deformation in the process of wave cancelling， it would be found that the development of boundary deformation mainly occurs along the downstream of disturbance source， playing a ripple， enlarged the ripple rather than back to prototype. It might mean that the existence of disturbances in the boundary lead to a divergent trend of physical boundary， showing the nonlinear trait of flow. Adopting the Standard Deviation of pressure to evaluate the uniformity of supersonic flow， it would be found that the flow combination of weak disturbance might be a linear process. And along the stream， rang of disturbance was enlarged， the peak of disturbance was reduced， the convergence of disturbance was avoided.

Key words: Pressure inverse problem；Bicharacteristics method；Local pressure disturbance；Geometric deformation；Supersonic flow；Wave cancelling