Abstract
In the steam tunnel, the condensation phenomena in a steam turbine cascade and a laval nozzle were visually confirmed by the color schlieren method. In a one-dimensional laval nozzle, when the wetness increases under the constant Mach number and Reynolds number, the condensation shock wave appears in the main stream and is transported towards upstream at higher wetness.
The similar phenomena were observed in a two-dimensional turbine cascade, and the condensation shock wave appears upstream of the wake shock waves normally observed in the superheated steam condition.
