Calculation and Analysis of the Thermophysical Parameters of Micro-Emulsified Ethanol-Diesel Blended Fuel

Abstract

The micro-emulsified ethanol-diesel blended fuel is an ideal alternative oxygenous fuel for diesel engines due to its physical and chemical properties and excellent combustion characteristics. Fueled with this fuel, a diesel engine can give off remarkably lower harmful emissions,especially particulate. It is necessary to take into account instantaneous variations of the thermophysical parameters of blended fuels with temperature and pressure. For these reasons, this paper use the empirical formulas calculates the thermophysical parameters of this blended fuel，including the specific heat capacity, viscosity, thermal conductivity and diffusion coefficient. And the effects of the temperature, pressure and ethanol content on the initial blended fuel’s condition are investigated. The results show that the addition of some ethanol to the diesel oil can contribute to the evaporation of the micro-emulsified ethanol-diesel blended fuel, and these empirical formulas are able to be employed to calculate the thermophysical parameters of this blended fuel.

Study of fuel spray characteristics using a high-pressure common rail diesel injection system by the method of Schlieren

“…The magnitude of the thermal conductivity directly determines the efficiency of heat and mass transfer of the fuel, which in turn affects the rate of atomization and diffusion (Figure 3). Hu et al 25 proposed the following equation for estimating the thermal conductivity (equation ( 8)):…”