Development of a Computationally Efficient Progress Variable Approach for a Direct Injection Stochastic Reactor Model

Paper #:
  • 2017-01-0512

Published:
  • 2017-03-28
Abstract:
A novel 0-D Probability Density Function (PDF) based approach for the modelling of Diesel combustion using tabulated chemistry is presented. The Direct Injection Stochastic Reactor Model (DI-SRM) [1] has been extended with a progress variable based framework allowing the use of a pre-calculated auto-ignition table. The auto-ignition is tabulated through adiabatic constant pressure reactor calculations. The tabulated chemistry based implementation has been assessed against the previously presented DI-SRM version [1] where chemical reactions are solved online. The chemical mechanism used in this work for both, online chemistry run and table generation, is an extended version of the scheme presented in [2]. The main fuel species are n-decane, α-methylnaphthalene and methyldecanoate and giving a size of 463 species and 7600 reactions. The progress variable method is presented and validated. A single-injection part-load heavy-duty Diesel engine case with 27 % EGR fuelled with regular Diesel is investigated with both tabulated chemistry and online chemistry. Comparisons between the two approaches are presented by means of overall engine performance and engine-out emission predictions and in equivalence ratio-temperature space. The new implementation delivers reasonably good agreement with the online chemistry one. The methodology presented in this paper allows for the use of detailed chemistry in the DI-SRM with very high computational efficiency and facilitates thus the use of DI-SRM in the engine development process. 1. Pasternak, M., Mauss, F., Perlman, C., Lehtiniemi, H., “Aspects of 0D and 3D Modeling of Soot Formation for Diesel Engines”, Combustion Science and Technology. 186:10-11, 1517-1535, 2014. doi: 10.1080/00102202.2014.935213 2. Nawdiyal, A., Wang, X., Seidel, L., Mauss, F., Zeuch, T., “Kinetic Model for Surrogate Diesel Fuel Comprising n-Decane and α-Methylnaphthalene”, 24th International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS), July 28 – August 2, Taipei, 2013
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