A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel Engine
The global demand for clean fuels is increasing in order to meet the requirements of the International Maritime Organization (IMO) of 0.5% global Sulphur cap and Tier III emission limits. Natural gas has begun to be popularized on liquefied natural gas (LNG) ships because of its low cost and environ...
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doaj-cfd4a19cdb8347e68bde5f78490a684d2020-11-25T03:41:03ZengMDPI AGProcesses2227-97172020-11-0181396139610.3390/pr8111396A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel EngineHao Guo0Song Zhou1Jiaxuan Zou2Majed Shreka3College of Energy and Power Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Energy and Power Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Energy and Power Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Energy and Power Engineering, Harbin Engineering University, Harbin 150001, ChinaThe global demand for clean fuels is increasing in order to meet the requirements of the International Maritime Organization (IMO) of 0.5% global Sulphur cap and Tier III emission limits. Natural gas has begun to be popularized on liquefied natural gas (LNG) ships because of its low cost and environment friendly. In large-bore marine engines, ignition with pilot fuel in the prechamber is a good way to reduce combustion variability and extend the lean-burn limit. However, the occurrence of knock limits the increase in power. Therefore, this paper investigates the effect of pilot fuel injection conditions on performance and knocking of a marine 2-stroke low-pressure dual-fuel (LP-DF) engine. The engine simulations were performed under different pilot fuel parameters. The results showed that the average in-cylinder temperature, the average in-cylinder pressure, and the NOx emissions gradually decreased with the delay of the pilot injection timing. Furthermore, the combustion situation gradually deteriorated as the pilot injection duration increased. A shorter pilot injection duration was beneficial to reduce NOx pollutant emissions. Moreover, the number of pilot injector orifices affected the ignition of pilot fuel and the flame propagation speed inside the combustion chamber.https://www.mdpi.com/2227-9717/8/11/1396computational fluid dynamicstwo-strokedual-fuel enginesimulationpre-combustion chamber |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hao Guo Song Zhou Jiaxuan Zou Majed Shreka |
spellingShingle |
Hao Guo Song Zhou Jiaxuan Zou Majed Shreka A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel Engine Processes computational fluid dynamics two-stroke dual-fuel engine simulation pre-combustion chamber |
author_facet |
Hao Guo Song Zhou Jiaxuan Zou Majed Shreka |
author_sort |
Hao Guo |
title |
A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel Engine |
title_short |
A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel Engine |
title_full |
A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel Engine |
title_fullStr |
A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel Engine |
title_full_unstemmed |
A Numerical Study on the Pilot Injection Conditions of a Marine 2-Stroke Lean-Burn Dual Fuel Engine |
title_sort |
numerical study on the pilot injection conditions of a marine 2-stroke lean-burn dual fuel engine |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2020-11-01 |
description |
The global demand for clean fuels is increasing in order to meet the requirements of the International Maritime Organization (IMO) of 0.5% global Sulphur cap and Tier III emission limits. Natural gas has begun to be popularized on liquefied natural gas (LNG) ships because of its low cost and environment friendly. In large-bore marine engines, ignition with pilot fuel in the prechamber is a good way to reduce combustion variability and extend the lean-burn limit. However, the occurrence of knock limits the increase in power. Therefore, this paper investigates the effect of pilot fuel injection conditions on performance and knocking of a marine 2-stroke low-pressure dual-fuel (LP-DF) engine. The engine simulations were performed under different pilot fuel parameters. The results showed that the average in-cylinder temperature, the average in-cylinder pressure, and the NOx emissions gradually decreased with the delay of the pilot injection timing. Furthermore, the combustion situation gradually deteriorated as the pilot injection duration increased. A shorter pilot injection duration was beneficial to reduce NOx pollutant emissions. Moreover, the number of pilot injector orifices affected the ignition of pilot fuel and the flame propagation speed inside the combustion chamber. |
topic |
computational fluid dynamics two-stroke dual-fuel engine simulation pre-combustion chamber |
url |
https://www.mdpi.com/2227-9717/8/11/1396 |
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