A Study on Transient Spray Behavior of Multi-component Fuel
Pages 53-54
Details
Pages 53-54
In multi-component liquid fuel spray, droplet atomization is affected by difference in physical properties (i.e., liquid density, surface tension, kinematics viscosity, etc.) of each component. Especially vaporization process is dominated by mass fraction of mixed components and distillation curve (boiling point). And hence, droplet atomization and vaporization process of multi-component fuel is different from those of a single component fuel. In this study, diesel spray characteristics (i.e., liquid length) of multi-component fuel (3 components mixed fuel) were investigated using Mie-scattered light imaging. Experiment was conducted in various injection pressure (25Mpa∿112Mpa), ambient gas density (5kg/m^3∿20kg/m^3), ambient gas temperature (400K∿700K) and different fuel mass fraction. And the effect of fuel temperature (300K, 368K) was investigated in order to assess vaporization characteristics on cold starting and normal operating condition. Fuel was injected into constant volume vessel through a hole type nozzle. Used fuel contains i-octane (C_8H_<18>), n-dodecane (C_<12>H_<26>) and n-hexadecane (C_<16>H_<34>) which were selected as low-, middle- and high-boiling point fuel, respectively. Experimental results show that liquid length is decreased with increasing volatility fraction within the multi-component fuel.
