If the "choke line" is the point at which the boundary layer next to the vanes breaks down, then water injection will surely make the compressor more efficient.
The water droplets will make the air denser. Denser fluids have less vorticity. Vorticity is responsible for turbulence and the breakdown of the boundary layer.
Therefore denser air makes the turbo more efficient by reducing vorticity and thus stabilizing the boundary layer of air.
Makes sense, right?
Adrian~
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