| Popis: |
Methanol, produced from natural may be considered as an alternative fuel for fossil based liquid fueled gas turbines, especially for land based systems. In the present work, the effect of physical properties of methanol and kerosene on atomization and evaporation are compared. The spray’s liquid flux, droplet sizes and droplet velocities, cone angle were measured using Phase Doppler Particle Analyzer/Laser Doppler Velocimeter (TSI PDPA/LDV) system. Water, kerosene and ethanol (ethanol instead of methanol was used due to the toxicity of methanol) were used and tested at the same input liquid pressures. Analytical analysis of evaporation time for a single droplet of kerosene and methanol showed that the evaporation time is about the same for two fuels with the same droplet diameters. However, due the methanol’s lower calorific value and the fact that its volume flux must be more than twice as much (for similar thermal power), its corresponding evaporation time is longer than for kerosene. The evaporation time for kerosene and methanol, which took into accounts that more methanol should be evaporated, was simulated by CFD. The simulation results showed that methanol spray requires significantly longer distance than kerosene. Thus, the spray of methanol has larger droplet diameter than kerosene and prolonged evaporation time.Copyright © 2015 by ASME |
