[Greenv8s]

Your diagrams still seem to show the water spraying onto the whole face of the turbine. I assume that the water erosion could be avoided by ensuring that the water didn't impinge on the tips of the blades, could this be achieved by having a narrow jet on the center line very close to the turbine? I mean within an inch or two. I'm envisaging something like a pitot tube inserted into the air intake close to the turbine.

On another tack, to stop droplets formed on the walls from hitting the tips of the blades it may be possible to pinch an idea from a Porsche crank scraper. Imagine the air intake as a vertical tube with the turbine at the bottom. Step the wall in just above the turbine, and shape the wall so it forms a gutter. Angle the gutter so it forms a spiral rather than a circle. At the 'lowest' point, put a rib taking the gutter out to the middle of the turbine, still with the gutter profile so that water has to run out to the end of the gutter and can't just drip off the sides. Assuming the air speed is high I think aerodynamic forces would be quite high compared to gravity so the water might be pursuaded to go 'uphill' towards the axis of the turbine (if you see what I mean). From point of view of air flow it would look like a straightening vane with relative little drag.

Just a thought, what do you make of it?

Oh, by the way, can anyone put any numbers to the turbine tip speed and the water droplet speed at the jet? I'm wondering whether there's any mileage in tangential injection ...