Effect of Intake Air Humidification and EGR on Combustion and Emission Characteristics of Marine Diesel Engine at Advanced Injection Timing

2021 ◽  
Author(s):  
Ke Wang ◽  
Changpu Zhao ◽  
Yujie Cai
Keyword(s):  
Diesel Engine ◽  
Injection Timing ◽  
Emission Characteristics ◽  
Marine Diesel Engine ◽  
Marine Diesel ◽  
Air Humidification

scholarly journals Impact of Pilot Injection on Combustion and Emission Characteristics of a Low-Speed Two-Stroke Marine Diesel Engine

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 417
Author(s):  
Xingyu Liang ◽  
Ziyang Liu ◽  
Kun Wang ◽  
Xiaohui Wang ◽  
Zhijie Zhu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Thermal Efficiency ◽  
Injection Timing ◽  
Emission Characteristics ◽  
Marine Diesel Engine ◽  
Pilot Injection ◽  
Long Distance ◽  
Low Speed ◽  
Marine Diesel

Low-speed two-stroke marine diesel engines dominate the modern global long-distance transportation market; with the increasingly stringent regulations, the combustion and emissions of these engines is gaining intense interest. The primary objective of the present study was to understand the effects of air-fuel mixing by pilot injection strategy on the combustion and emission characteristics of the marine diesel engines through a numerical study. Specifically, a computational fluid dynamic (CFD) model was established and validated by experimental data for a typical low-speed two-stroke marine diesel engine. The combustion parameters under different stages were analyzed, including mean in-cylinder temperature and pressure, indicated thermal efficiency (ITE), indicated specific fuel consumption (ISFC), and distribution of fuel-air mixture. Results indicated that, due to the premixing effect, the pilot injection produced unburned soot from the main injection’s ignition as well as decrease the intervals between the middle and final stages of combustion, thus raising the in-cylinder temperature. The interaction between the reduction of soot particles resulted from the increased temperature, and the decrease of the stage intervals led to lower overall boundary heat loss, which improved the effective thermal efficiency. The pilot injection timing and quality, respectively, showed quadratic and linear impact modes on engine performance and emissions.

scholarly journals Influence of Palm Biofuel for Marine Diesel Engine on Combustion and Exhaust Emission Characteristics

2018 ◽  
Vol 53 (3) ◽  
pp. 441-446 ◽  
Author(s):  
Sumito Nishio ◽  
Tetsugo Fukuda ◽  
Aguk Zuhdi Muhammad Fathallah ◽  
Hari Setiapraja
Keyword(s):  
Diesel Engine ◽  
Exhaust Emission ◽  
Emission Characteristics ◽  
Marine Diesel Engine ◽  
Marine Diesel

scholarly journals Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

2020 ◽  
Vol 8 (2) ◽  
pp. 109 ◽  
Author(s):  
María Isabel Lamas Galdo ◽  
Laura Castro-Santos ◽  
Carlos G. Rodriguez Vidal
Keyword(s):  
Diesel Engine ◽  
Nox Reduction ◽  
Water Injection ◽  
The Other ◽  
Chemical Effect ◽  
Injection Timing ◽  
Marine Diesel Engine ◽  
Marine Diesel ◽  
Dilution Effects ◽  
Ammonia Injection

This work analyzes NOx reduction in a marine diesel engine using ammonia injection directly into the cylinder and compares this procedure with water injection. A numerical model based on the so-called inert species method was applied. It was verified that ammonia injection can provide almost 80% NOx reduction for the conditions analyzed. Furthermore, it was found that the effectiveness of the chemical effect using ammonia is extremely dependent on the injection timing. The optimum NOx reduction was obtained when ammonia is injected during the expansion stroke, while the optimum injection timing using water is near top dead center. Chemical, thermal, and dilution effects of both ammonia and water injection were compared. The chemical effect was dominant in the case of ammonia injection. On the other hand, water injection reduces NOx through dilution and, more significantly, through a thermal effect.

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