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Simulation of transcritical Diesel jets using the PC-SAFT EoS

Rodriguez, C., Vidal, A., Koukouvinis, P. & Gavaises, M. (2018). Simulation of transcritical Diesel jets using the PC-SAFT EoS. Paper presented at the ICLASS 2018, 22-26 Jul 2018, Chicago, USA.


A numerical framework has been developed to simulate Diesel injections using the Perturbed Chain Statistical Associating FluidTheory (PC-SAFT) equation of state (EoS). The Diesel is modelled as a mixture composed by a rather small number of components that accurately replicate its properties. The composition of the Diesel surro-gates employed are divided into two typesdepending on how closely they approximatetherealDiesel composition. Despite of applying anadvanced molecular theory, practical simulations can be performed reducing the number of times the EoSis solved by calculating the pressure and sonic fluid velocity in thecell centers and performing a reconstruction of these variables at the cell faces. Thismethodologyis found to smooth-out the spurious pressure oscillations associated with conservative schemes used along real-fluid EoS.Furthermore, two shock tube prob-lemsarepresentedto validate the hyperbolic part of the numerical frameworkand evaluate how the number of compounds of theDieselsurrogateemployedaffects theaccuracy of the numerical results.Finally,a two-dimen-sional simulation of afour component Diesel surrogate injection is includedto demonstrate the capability of the developed method to predict Diesel fuel-airmixing.Phase separation isbeyond the scope of this research.

Publication Type: Conference or Workshop Item (Paper)
Departments: School of Science & Technology > Engineering
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