Abstract
Nozzle flow experiments were carried out in order to investigate low-pressure steam flow characteristics. Two types of nozzle blades, named "A" and "B", which are with or without an inlet large round head respectively were tested to compare nozzle flow characteristics. The experiments were conducted under an inlet total pressure of 0.3MPa, an inlet total temperature of the superheated and saturated, and a pressure ratio of about 1.5. The experimental results show that the mass mean total pressure ratios in nozzle B were a few percent higher and the results of the steam flow visualization with PIV technique show that the droplet flow in nozzle A has a boundary-layer exfoliation on the suction side of a nozzle blade.
