Numerical Investigation and Multi-Objective Optimization of Internal EGR and Post-Injection Strategies on the Combustion, Emission and Performance of a Single Cylinder, Heavy-Duty Diesel Engine

Volkan Akgül, Orkun Özener, Cihan Büyük and Muammer Özkan
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Volkan Akgül: Internal Combustion Engines Laboratory, Mechanical Engineering Department, Yıldız Technical University, 34349 İstanbul, Turkey
Orkun Özener: Internal Combustion Engines Laboratory, Mechanical Engineering Department, Yıldız Technical University, 34349 İstanbul, Turkey
Cihan Büyük: TÜMOSAN Engine and Tractor Co., 34010 İstanbul, Turkey
Muammer Özkan: Internal Combustion Engines Laboratory, Mechanical Engineering Department, Yıldız Technical University, 34349 İstanbul, Turkey

Energies, 2020, vol. 14, issue 1, 1-21

Abstract: This work presents a numerical study that investigates the optimum post-injection strategy and internal exhaust gas recirculation (iEGR) application with intake valve re-opening (2IVO) aiming to optimize the brake specific nitric oxide ( bs NO) and brake specific soot ( bs Soot) trade-off with reasonable brake specific fuel consumption (BSFC) via 1D engine cycle simulation. For model validation, single and post-injection test results obtained from a heavy-duty single cylinder diesel research engine were used. Then, the model was modified for 2IVO application. Following the simulations performed based on Latin hypercube DoE; BSFC, bs NO and bs Soot response surfaces trained by feedforward neural network were generated as a function of the injection (start of main injection, post-injection quantity, post-injection dwell time) and iEGR (2IVO dwell) parameters. After examining the effect of each parameter on pollutant emission and engine performance, multi-objective pareto optimization was performed to obtain pareto optimum solutions in the BSFC- bs NO- bs Soot space for 8.47 bar brake mean effective pressure (BMEP) load and 1500 rpm speed condition. The results show that iEGR and post-injection can significantly reduce NO and soot emissions, respectively. The soot oxidation capability of post-injection comes out only if it is not too close to the main injection and its efficiency and effective timing are substantially affected by iEGR rate and main injection timing. It could also be inferred that by the combination of iEGR and post-injection, NO and soot could be reduced simultaneously with a reasonable increase in BSFC if start of main injection is phased properly.

Keywords: internal EGR; post-injection; diesel engine; exhaust emission; engine performance; optimization (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: 2020
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