Experimental and numerical investigation of the droplet behavior passing a compressor cascade

High fogging systems are often used in gas turbine power stations for power augmentation. Water droplets injected into the compressor inlet will partly follow the air flow, will partly be splashed at the compressor blades and partly touch the surface of the blades. The water film of the surface will be atomized at the trailing edge of the blade. The work presented concerns with the numerical calculation of the spray behavior passing a transonic compressor cascade investigating droplet atomization. The physical models used are discussed in detail. The comparison with measurements of the droplet velocity as well as of the droplet size distribution of the transonic two phase flow inside a planar compressor cascade explains the accuracy of the physical models used in the numerical investigation.