Study on Large Eddy Simulation of Diesel Supercritical Spray

With the constant increase of temperature and pressure in the combustion chamber of modern internal combustion engines, liquid fuel is often in the supercritical state, and compared with the subcritical state, its spray jet behavior characteristics have undergone great changes. In this study, the large eddy simulation method is used to numerically calculate the single-component and multi-component diesel surrogate fuel spray jets in supercritical environment, and the difference between different gas state equations in predicting the behavior of supercritical fuel injection of diesel fuel is compared. It is found that the simulation results of PR gas state equation on n-heptane mass fraction distribution are closer to the experimental values, with better results than other state equations. It is also found that the multi-component diesel characterized fuel(n-heptane mass fraction 80%, toluene mass fraction 10%, cyclohexane mass fraction 10%)used in this study can better reflect the characteristics of real diesel spray jet in supercritical environment. © 2021, Society of Automotive Engineers of China. All right reserved.