Supersonic moist air flow with condensation in a wavy wall channel

The characteristics of Prandtl-Meyer expansion of supersonic flow with cond ensation along a wavy wall in a channel are investigated by means of experi ments and numerical analyses. Experiments are carried out for the case of m oist air flow in an intermittent indraft supersonic wind tunnel. The flow f ields are visualized by a Schlieren system and the distributions of static pressure along the upper wavy wall are measured by a scanning valve system with pressure transducers. In numerical analyses, the distributions of stre amlines, Mach lines, iso-pressure lines, and iso-mass fractions of liquid a re obtained by the two-dimensional direct marching method of characteristic s. The effects of stagnation temperature, absolute humidity, and attack ang le of the upper wavy wall on the generation and the locations of generation and reflection of an oblique shock wave are clarified. Futhermore, it is c onfirmed that the wavy wall plays an important role in the generation of an oblique shack wave and that the effect of condensation on the flow fields is apparent.