【作者】

Andreas Wimmer,Gerhard Pirker,Michael Engelmayer

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 This paper gives an overview of cur-rent possibilities and challenges in precisely simulating the engine cycle of large Diesel engines. Both the increasing demands of emission legislation and com-petition are forcing greater efforts to be made in the design phase to predict the emissions and efficiency of engine concepts for large Diesel engines. In recent years, the development of simulation tools has allowed great progress to be made in prediction. However, due to the highly complex processes during combustion and emission formation in Diesel operation very high demands are placed on the employed tools. While3D CFD simulation is used to optimize the details of the combustion and emission formation processes in the combustion chamber, the OD and 1D engine cycle simulation are applied to select the concepts and to preoptimize important engine parameters. One great advantage of 0D and 1D models is their short calculation time, which allows the investigation of a great amount of variations in parameters. This paper investigates, compares and evaluates several 0D, quasidimensional and 3D simulation models for calculating the burn rate and the formation of soot and NOx. The0D combustion model evaluated (LEC-DCM) is based on a global description of the injection spray, while the quasi-dimensional model uses a multi-zone approach (MZCM). The assessment of the 3D combustion modeling comprises the extended coherent flame model (ECFM-3Z). Besides the combustion models one key factor is the injection rate history that provides the foundation for the accurate simulation. While the simulation of the NOx emission is mainly influenced by the quality of the burn rate model, the simulation of the soot formation and oxidation processes depends on significantly more parameters. Different models in0D as well as in 3D simulation were investigated. In addition, optical measurements on the single-cylinder research engine are used to validate the soot models.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

3

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