| The accurate measurement of flowing steam wetness in turbine has great significancefor efficiency of turbine, operating safety, guiding design of wet steam stages anddevelopment of moisture-removal technology in power plant.Various methods of wetness measurement researched broadly are summarized atpresent. It lists out the measurement principle of resonant cavity perturbation.Electromagnet and aerodynamic characteristic and the effect of water-film insidesensor of resonant cavity are analyzed. The mechanics of wet steam two-phase flowdroplet deposition in the perturbation of resonant cavity is given and model of thewater-film is derived and the result's curves are given. The measurement experimentsystem is analyzed and the pressure measurement method of Laval nozzle designed withequal expansion rate is given. Under the experiment and theoretic calculation, the modelfor spontaneous condensation in experiment nozzle is proved. The results are analyzed.
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