Development of a Zero Dimensional Turbulence and Heat Transfer Phenomenological Model for Pre-Chamber Gas Engines

Paper #:
  • 2018-01-1453

Published:
  • 2018-04-03
Abstract:
Most of the phenomena that occur during the high pressure cycle of a spark ignition engine are highly influenced by the mean gas temperature, turbulence intensity and turbulence length scale inside the cylinder. For a pre-chamber gas engine, the small volume and the high surface-to-volume ratio of the pre-chamber increases the relative significance of the gas-to-wall heat losses, the early flame kernel development and the wall induced quenching; all of these phenomena are associated with the turbulence and temperature field inside the pre-chamber. This article presents a novel model for the prediction of the temperature and pressure traces as well as the evolution of the mean and turbulence flow field of a pre-chamber gas engine. Existing turbulence and gas-to-wall heat transfer models initially developed for spark ignition and diesel engines were studied for their capability of simulating the pre-chamber phenomena. The zero dimensional model derived comprises two main novelties; namely, refinements of the existing models have been performed based on phenomenological observations specifically for the pre-chamber; in addition, extensive validation of the proposed submodels was conducted using results from detailed 3D CFD simulations of an instrumented research Liebherr gas engine in various operating points. The 3D CFD simulations providing the validation data for the proposed model are reported in the earlier work of Xu et.al. [1], [2]. Very good agreement has been obtained between the zero-dimensional and the 3D CFD simulations that verified the soundness of the developed model. [1] XU, G., et al., Experimental and Numerical Investigation of the Engine Operational Conditions’ Influences on a Small Un-Scavenged Pre-Chamber’s Behavior. SAE International Journal of Engines, 2017. 10(5). [2] XU, G., et al., Characterization of combustion in a small un-scavenged pre-chamber employed in stationary gas engines, International Journal of Engine Research, 2017 (under review)
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