Combustion optimization of a marine di diesel engine
Paper i proceeding, 2013

Enhanced calibration strategies and innovative engine combustion technologies are required to meet the new limits on exhaust gas emissions enforced in the field of marine propulsion and on-board energy production. The goal of the paper is to optimize the control parameters of a 4.2 dm3 unit displacement marine DI Diesel engine, in order to enhance the efficiency of the combustion system and reduce engine out emissions. The investigation is carried out by means of experimental tests and CFD simulations. For a better control of the testing conditions, the experimental activity is performed on a single cylinder prototype, while the engine test bench is specifically designed to simulate different levels of boosting. The numerical investigations are carried out using a set of different CFD tools: GT-Power for the engine cycle analysis, STAR-CD for the study of the in-cylinder flow, and a customized version of the KIVA-3V code for combustion. All the models are calibrated through the above mentioned experimental campaign. Then, CFD simulations are applied to optimize the injection parameters and to explore the potential of the Miller combustion concept. It is found that the reduction of the charge temperature, ensuing the adoption of an early intake valve closing strategy, strongly affects combustion. With a proper valve actuation strategy, an increase of boost pressure and an optimized injection advance, a 40% reduction of NOx emissions can be obtained, along with a significant reduction of in-cylinder peak pressure, without penalizing fuel efficiency.

Combustion technology

Intake valve closings

Experimental activities

Engine-out emissions

Injection parameters

Experimental campaign

Numerical investigations

Combustion optimization

Ship Propulsion


E. Mattarelli

Universita Degli Studi Di Modena E Reggio Emilia

S. Fontanesi

Universita Degli Studi Di Modena E Reggio Emilia

C.A. Rinaldini

Universita Degli Studi Di Modena E Reggio Emilia

G. Valentino

Universita Degli Studi Di Modena E Reggio Emilia

S.E. Iannuzzi

Universita Degli Studi Di Modena E Reggio Emilia

E. Severi

Universita Degli Studi Di Modena E Reggio Emilia

Valeri Golovitchev

Chalmers, Tillämpad mekanik, Förbränning och framdrivningssystem

SAE Technical Papers

Vol. 6


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