Bharti, Mohit and Kolhe, Pankaj
(2019)
Spray Characterization of twin-fluid atomizer using Phase
Doppler Particle Analyzer.
Masters thesis, Indian institute of technology Hyderabad.
Abstract
Spray Characterization of Air-blast and Flow-blurring atomizer are studied using water and Soya oil as surrogate fuels. The Phase Doppler Particle Analyzer (PDPA), point measurement technique was utilized to do experiments. The regular spray characteristics like Mean axial velocity and Sauter mean diameter (SMD) are presented and also some important alternate statistics like volume weighted diameter and volume weighted velocity are explored for diameter and velocity of droplets. Effect of Air to Liquid mass ratio on diameter and velocity of droplets is discussed. We observed that as ALR increases, the velocity of droplet increases due to high-pressure drop in the injector, and high aerodynamic force reduces droplet diameter in the spray. So spray become more atomized at high ALR. Non-reacting vegetable oil and water sprays are compared for AB and FB atomizer. High viscous force in VO increases the optimum wavelength of jet break up, which results in bigger drop size compared to water. In AB atomizer, there is a huge difference in SMD, but in the case of FB atomizer, there is less difference in SMD between sprays. Results indicate that even though viscosity of VO is 50 times that of water, FB atomization is less affected by the viscosity of fuels compared to AB atomization. Next, spray characteristics of Flowblurring atomizer is compared with Air-blast atomizer for water and VO liquid fuels. Flowblurring atomizer produces sprays with a narrower range of drop sizes compared to Air-blast atomizer, which signifies larger surface area creation per unit volume of atomized liquid indicating better atomizing efficiency compared to AB atomizer. This happens due to the intense mixing of fuel and air at the liquid fuel tip in FB atomizer and prior to exiting the orifice.
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