Autors: Punov, P. B., Niculae, M., Clenci, A., Mihalkov, S., Iorga-Siman, V., Danlos, A.
Title: Assessment of the Miller cycle operation in a spark ignition engine via 1D numerical simulation
Keywords: Miller cycle, 1D simulation, Blow-by, Motoring

Abstract: The article presents the results of a 1D numerical simulation of a spark ignition engine developed to operate in Miller cycle. Miller cycle offers better thermal efficiency compared to Otto cycle due to higher volumetric expansion than compression, which in the current context is of paramount importance. In an engine with fixed geometric compression ratio, Miller cycle operation could be realized by means of either early intake valve closing (EIVC) or late intake valve closing (LIVC). Both cases lead however to a lower volumetric efficiency, thus reducing the indicating mean effective pressure, which in its turn results to a lower power output. The simulation's aim is not only to assess the impact of implementing the Miller cycle but also to obtain the necessary results for imposing the boundary conditions in a 3D CFD simulation whose purpose is to analyse the influence of the Miller cycle on the internal aerodynamics of the engine.

References

  1. Zhao J 2017 Research and application of over-expansion cycle (Atkinson and Miller) engines – A review Appl. Energy 185 300–19
  2. Wei H, Shao A, Hua J, Zhou L and Feng D 2018 Effects of applying a Miller cycle with split injection on engine performance and knock resistance in a downsized gasoline engine Fuel 214 98–107
  3. Perceau M, Guibert P and Guilain S 2021 Zero-dimensional turbulence modeling of a spark ignition engine in a Miller cycle « Dethrottling » approach using a variable valve timing system Appl. Therm. Eng. 199 117535
  4. Wang J, Duan X, Wang W, Guan J, Li Y and Liu J 2021 Effects of the continuous variable valve lift system and Miller cycle strategy on the performance behavior of the lean-burn natural gas spark ignition engine Fuel 297 120762
  5. Aghdam E A and Kabir M M 2010 Validation of a blowby model using experimental results in motoring condition with the change of compression ratio and engine speed Exp. Therm. Fluid Sci. 34 197–209
  6. Irimescu A, Tornatore C, Marchitto L and Merola S S 2013 Compression ratio and blow-by rates estimation based on motored pressure trace analysis for an optical spark ignition engine Appl. Therm. Eng. 61 101–9
  7. Pipitone E and Beccari A 2010 Determination of TDC in internal combustion engines by a newly developed thermodynamic approach Appl. Therm. Eng. 30 1914–26
  8. Woschni G 1967 A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in Internal Combustion Engines SAE 6700931

Issue

IOP Conference Series: Earth and Environmental Science, vol. 960, issue 1, pp. 012014, 2022, Romania, IOP Publishing Ltd, ISSN 17551307

Copyright IOP Publishing Ltd

Full text of the publication

Вид: пленарен доклад в международен форум, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus