With slot hot gas blowing

the secondary water droplet diameters and its distributions downstream of the hollow stationary blade were measured by Malvern droplet and particle size analysers. The tests were conducted at inlet gas wetness of 7.94%

an outlet gas velocity of 170 m/s

a slot width of 1.0 mm

a slot angle of 45°

temperature difference between hot gas and main gas of 50 ℃

and the slot position on concave or convex of the hollow stationary blade surface. The results show that the slot hot gas blowing could reduce the minimum and maximum diameters of secondary water droplets downstream of the stationary blade

The Sauter mean diameter of secondary water droplets could be reduced by 33.4%

and the water droplet diameter distribution became narrow. The larger the blowing pressure difference

the smaller the secondary water droplets

and the narrower the water droplet diameter distribution. This may be beneficial to reducing or preventing the rotational blade erosion. In addition

the slot located on the convex surface of hollow stationary blade was better than that on the concave surface in water removal.