Numerical investigation on knock characteristics and mechanism of large-bore natural gas dual-fuel marine engine

Fuel ◽  
2022 ◽  
Vol 310 ◽  
pp. 122298
Author(s):  
Long Liu ◽  
Yue Wu ◽  
Yang Wang
Keyword(s):  
Natural Gas ◽  
Numerical Investigation ◽  
Dual Fuel ◽  
Marine Engine

scholarly journals A Numerical Study on the Combustion Process and Emission Characteristics of a Natural Gas-Diesel Dual-Fuel Marine Engine at Full Load

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1342
Author(s):  
Van Chien Pham ◽  
Jae-Hyuk Choi ◽  
Beom-Seok Rho ◽  
Jun-Soo Kim ◽  
Kyunam Park ◽  
...  
Keyword(s):  
Natural Gas ◽  
Combustion Process ◽  
Simulation Software ◽  
Dual Fuel ◽  
Injection Timing ◽  
Emission Characteristics ◽  
Cylinder Pressure ◽  
Marine Engine ◽  
Full Load ◽  
Simulation Results

This paper presents research on the combustion and emission characteristics of a four-stroke Natural gas–Diesel dual-fuel marine engine at full load. The AVL FIRE R2018a (AVL List GmbH, Graz, Austria) simulation software was used to conduct three-dimensional simulations of the combustion process and emission formations inside the engine cylinder in both diesel and dual-fuel mode to analyze the in-cylinder pressure, temperature, and emission characteristics. The simulation results were then compared and showed a good agreement with the measured values reported in the engine’s shop test technical data. The simulation results showed reductions in the in-cylinder pressure and temperature peaks by 1.7% and 6.75%, while NO, soot, CO, and CO2 emissions were reduced up to 96%, 96%, 86%, and 15.9%, respectively, in the dual-fuel mode in comparison with the diesel mode. The results also show better and more uniform combustion at the late stage of the combustions inside the cylinder when operating the engine in the dual-fuel mode. Analyzing the emission characteristics and the engine performance when the injection timing varies shows that, operating the engine in the dual-fuel mode with an injection timing of 12 crank angle degrees before the top dead center is the best solution to reduce emissions while keeping the optimal engine power.

Numerical Investigation of Natural Gas-Diesel Dual Fuel Engine with End Gas Ignition

2018 ◽  
Author(s):  
Apoorv Talekar ◽  
Ming-Chia Lai ◽  
Eiji Tomita ◽  
Nobuyuki Kawahara ◽  
Ke Zeng ◽  
...  
Keyword(s):  
Natural Gas ◽  
Numerical Investigation ◽  
Dual Fuel ◽  
Gas Ignition

A numerical investigation on methane combustion and emissions from a natural gas-diesel dual fuel engine using CFD model

2017 ◽  
Vol 205 ◽  
pp. 153-162 ◽  
Author(s):  
Yu Li ◽  
Hailin Li ◽  
Hongsheng Guo ◽  
Yongzhi Li ◽  
Mingfa Yao
Keyword(s):  
Natural Gas ◽  
Numerical Investigation ◽  
Methane Combustion ◽  
Dual Fuel ◽  
Cfd Model

Numerical Investigation on the Combustion Performance of a Natural Gas/Hydrogen Dual Fuel Rotary Engine under the Action of Apex Seal Leakage

2020 ◽  
Vol 35 (1) ◽  
pp. 770-784
Author(s):  
Baowei Fan ◽  
Yuanguang Wang ◽  
Yaoyuan Zhang ◽  
Jianfeng Pan ◽  
Wenming Yang ◽  
...  
Keyword(s):  
Natural Gas ◽  
Numerical Investigation ◽  
Dual Fuel ◽  
Combustion Performance ◽  
Rotary Engine

scholarly journals A Mapping Approach for Efficient CFD Simulation of Low-Speed Large-Bore Marine Engine with Pre-Chamber and Dual-Fuel Operation

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6126
Author(s):  
Ying Ye ◽  
Zongyu Yue ◽  
Hu Wang ◽  
Haifeng Liu ◽  
Chaohui Wu ◽  
...  
Keyword(s):  
Natural Gas ◽  
Cfd Simulation ◽  
Exothermic Reaction ◽  
Combustion Process ◽  
Equation Model ◽  
Dual Fuel ◽  
Marine Engine ◽  
Mapping Approach ◽  
Effective Manner ◽  
Depth Analysis

A natural-gas-diesel dual-fuel marine engine with a pre-chamber is a promising solution for ocean transportation to meet the International Maritime Organization (IMO) emission regulations. This engine system employs a pre-chamber with direct injection of diesel to ignite premixed natural gas due to its higher ignition energy, which can enable lower lean limit and higher thermal efficiency. The dual-fuel pre-chamber marine engine presents complex multi-regime combustion characteristics in- and outside the pre-chamber, thus posing challenges in its numerical simulation in a cost-effective manner. Therefore, this paper presents a three-dimensional modeling study for the multi-regime combustion in a large-bore two-stroke marine dual-fuel engine, proposing a novel mapping approach, which couples the well-stirred reactor (WSR) model with the G-equation model to achieve high computational accuracy and efficiency simultaneously. In-depth analysis is performed using representative exothermic reaction (RXR) analysis and premixed turbulent combustion fundamentals to better understand the combustion process and to provide guidance in the selection of mapping timing. The results show that the use of mapping to switch from the WSR to the G-equation model can effectively reduce the runtime significantly by 71.5%, meanwhile maintaining similar accuracies in predictions of in-cylinder pressure traces, HRR and NOx emissions, compared to using WSR all along. Additionally, the choice of mapping timing based on several parameters is preliminarily discussed.

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