Experimental Study on Single-Hole Injection of Kerosene into Pressurized Quiescent Environments

Experiments on kerosene spray through a single-hole nozzle are carried out under various ambient pressures ranging from 1.4 to 5.6 MPa. High-speed schlieren photography is used to capture the time-dependent images of the kerosene spray. Repetitive experiments are conducted to verify the repeatability of the penetration tip of kerosene spray, and through analysis it is found that the penetration tip is repeatable to +/- 7%. The density of the ambient gas is calculated with the Redlich-Kwong equation of state (EOS) instead of the ideal gas law. Because the material property of kerosene differs from that of diesel, a new modified correlation is proposed to predict the penetration tip of kerosene spray, which provides a higher accuracy than existing methods. The analysis shows that when the ambient pressure is high enough, the influence of injection pressure on the projected spray area becomes weak. The penetration tip velocities are analyzed, and the development of the spray cone angle is discussed and analyzed. All the macro characteristics and the new modified correlation discussed in this study are foundations for two-phase combustion in aeronautical engines or diesel engines fueled by kerosene as a substitution. (C) 2018 American Society of Civil Engineers.