Abstract The supercritical diesel combustion concept is expected to increase the engine efficiency and reduce the harmful emissions. The investigations of diesel trans-critical and supercritical injections are the basis to… Click to show full abstract
Abstract The supercritical diesel combustion concept is expected to increase the engine efficiency and reduce the harmful emissions. The investigations of diesel trans-critical and supercritical injections are the basis to understand this new diesel combustion concept. In order to numerically study the trans/supercritical injection characteristics of commercial diesel, the critical temperature of real commercial diesel was experimentally measured and the method to calculate the critical point of multi-component mixture was verified. A six-component surrogate of commercial diesel was formulated by a model-based surrogate formulation method. The comparisons between the predicted properties of six-component surrogate and the measured data of real commercial diesel were conducted. The results show that the surrogate can emulate many temperature-independent properties (cetane number, lower heating value, critical temperature and distillation temperature) and the temperature-dependent properties (density, viscosity, surface tension and thermal conductivity) with extreme small deviation. These properties have significant effect on sub/trans/supercritical injections of the commercial diesel. In addition, the surrogate was applied to simulate the diesel trans-critical injection with the continuous Euler method. The predicted liquid and vapor penetration have excellent agreement with the measured values.
               
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