Experimental study of sizes and velocities for droplets produced by pneumatic injection of water into the input system of a piston internal ingition engine applying the optic methods
M.D. Garipov1, A.G. Khafizov2, R.F. Zinnatullin1, A.A. Melkov1, V.A. Shayakhmetov1, O.A. Gobyzov3
1Ufa Science and Technology University, Ufa, Russia
2Zauralskii Power Station, BSU affiliation, Sibai, Russia
3Novosibirsk State University, Novosibirsk, Russia
Keywords: pneumatic system of water injection, Shadow Photography, 2D-PIV, differential and integral volumetric droplet size distributions, droplet equivalent diameter
Abstract
The paper studies the quality of water spraying by a pneumatic injection system designed for water injection into the input system of a piston internal ignition engine. The system consists of a two-cylinder piston compressor with compression of water-air mixture phase in the compressor’s cavities. The piston compressor has connection to the atomizer through long channels. The droplet sizes were measured through automatic image processing by the Shadow Photography method. The velocity field of droplets was measured by the 2D-PIV method . Experimental results demonstrated that the injection system offers a high quality of spraying for the air/water mass ratio higher than 0.46. The value of Sauter mean diameter was less than 31.1 µm.
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