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research-article

Experimental analysis of cyclical dispersion in CI vs. SI engines and its significance for combustion noise numerical modelling

[+] Author and Article Information
Alberto Broatch

CMT – Motores Térmicos, Universitat Politècnica de València, Camino de Vera, 46022, Valencia, Spain
abroatch@mot.upv.es

J. Javier Lopez

CMT – Motores Térmicos, Universitat Politècnica de València, Camino de Vera, 46022, Valencia, Spain
jolosan3@mot.upv.es

Jorge García-Tíscar

CMT – Motores Térmicos, Universitat Politècnica de València, Camino de Vera, 46022, Valencia, Spain
jorgarti@mot.upv.es

Josep Gomez-Soriano

CMT – Motores Térmicos, Universitat Politècnica de València, Camino de Vera, 46022, Valencia, Spain
jogoso1@mot.upv.es

1Corresponding author.

ASME doi:10.1115/1.4040287 History: Received November 29, 2017; Revised May 08, 2018

Abstract

As noise pollution remains one of the biggest hurdles posed by thermal engines, increasing efforts are made to alleviate the generation of combustion noise from the early design stage of the chamber. Since the complexity of both modern chamber geometries and the combustion process itself precludes robust analytic solutions, and since the resonant, highly 3D pressure field is difficult to be measured experimentally, focus is put on the numerical modelling of the process. However, in order to optimize the resources devoted to this simulation, an informed decision must be made on which formulations are followed. In this work, the experimental cyclic dispersion of the in-cylinder pressure is analyzed in two typical compression-ignited (CI) and spark-ignited (SI) engines. Acoustic signatures and pressure rise rates are derived from this data, showing how while the preponderance of flame front propagation and dependency of previous cycle in SI engine noise usually calls for multi-cycle, more complex turbulence modelling such as Large Eddy Simulation (LES), simpler Unsteady Reynolds-Averaged Navier-Stokes (URANS) formulations can accurately characterize the more consistent pressure spectra of CI thermal engines, which feature sudden autoignition as the main noise source.

Copyright (c) 2018 by ASME
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