Combustion Modeling Approach for the Optimization of a Temperature Controlled Reactivity Compression Ignition Engine Fueled with Iso-Octane

Mattia Pelosin, Ricardo Novella, Gabriela Bracho (), Cássio Fernandes, Tommaso Lucchini, Luca Marmorini and Qiyan Zhou
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Mattia Pelosin: Politecnico di Milano—Mechanical Department, Via Privata Giuseppe La Masa, 20156 Milano, Italy
Ricardo Novella: CMT—Motores Térmicos, Universitat Politècnica de València, Camino de Vera, 46022 Valencia, Spain
Gabriela Bracho: CMT—Motores Térmicos, Universitat Politècnica de València, Camino de Vera, 46022 Valencia, Spain
Cássio Fernandes: CMT—Motores Térmicos, Universitat Politècnica de València, Camino de Vera, 46022 Valencia, Spain
Tommaso Lucchini: Politecnico di Milano—Energy Department, Via Lambruschini, 20156 Milano, Italy
Luca Marmorini: Marmotors srl, Via XXV Aprile, 52100 Arezzo, Italy
Qiyan Zhou: Politecnico di Milano—Energy Department, Via Lambruschini, 20156 Milano, Italy

Energies, 2022, vol. 15, issue 21, 1-26

Abstract: In this study, an innovative Low Temperature Combustion (LTC) system named Temperature Controlled Reactivity Compression Ignition (TCRCI) is presented, and a numerical optimization of the hardware and the operating parameters is proposed. The studied combustion system aims to reduce the complexity of the Reaction Controlled Compression Ignition engine (RCCI), replacing the direct injection of high reactivity fuel with a heated injection of low reactivity fuel. The combustion system at the actual state of development is presented, and its characteristics are discussed. Hence, it is clear that the performances are highly limited by the actual diesel-derived hardware, and a dedicated model must be designed to progress in the development of this technology. A Computational Fluid Dynamics (CFD) model suitable for the simulation of this type of combustion is proposed, and it is validated with the available experimental operating conditions. The Particle Swarm Optimization (PSO) algorithm was integrated with the Computational Fluid Dynamic (CFD) software to optimize the engine combustion system by means of computational simulation. The operating condition considered has a relatively high load with a fixed fuel mass and compression ratio. The parameters to optimize are the piston bowl geometry, injection parameters and the boosting pressure. The achieved system configuration is characterized by a wider piston bowl and injection angle, and it is able to increase the net efficiency of 3% and to significantly reduce CO emissions from 0.407 to 0.136 mg.

Keywords: Temperature Controlled Reactivity Compression Ignition (TCRCI); Low Temperature Combustion (LTC); combustion system optimization; numerical simulation; fuel efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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