Experimental study on the gas jet characteristics of a diesel-piloted direct-injection natural gas engine

2021 ◽  
Vol 35 (3) ◽  
pp. 1279-1288
Author(s):  
Peng Jiang ◽  
Xu Liu ◽  
Lixuan Cao ◽  
Qian Wang ◽  
Zhixia He
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Direct Injection ◽  
Gas Jet ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Jet Characteristics

Particulate Matter Reduction From a Pilot-Ignited, Direct Injection of Natural Gas Engine

2012 ◽  
Author(s):  
G. P. McTaggart-Cowan ◽  
K. Mann ◽  
J. Huang ◽  
N. Wu ◽  
S. R. Munshi
Keyword(s):  
Particulate Matter ◽  
Natural Gas ◽  
Direct Injection ◽  
Pressure Rise ◽  
Gas Jet ◽  
Cfd Analysis ◽  
Heavy Duty ◽  
Effective Technique ◽  
Gas Engine ◽  
Natural Gas Engine

This paper reports an evaluation of various combustion strategies aiming to reduce engine-out particulate matter (PM) emissions from a natural-gas fuelled heavy-duty engine. The work is based on a Westport HPDI fuelling system, which provides direct injection of both natural gas and liquid diesel into the combustion chamber of an otherwise unmodified diesel engine. The diesel acts as a pilot to ignite the natural gas, which normally burns in a non-premixed fashion, leading to significant PM formation. The concepts to reduce PM evaluated in this work are: 1) adjusting the relative phasing of the natural gas and diesel injections to allow more premixing of the natural gas prior to ignition; 2) reducing the pilot quantity to increase the ignition delay of the gas jet; and 3) reducing the level of EGR at select modes to reduce PM formation. These strategies are evaluated at steady state using single- and multi-cylinder research engines, supported by CFD analysis. The results demonstrate that allowing limited premixing of the gas jet prior to ignition can significantly reduce PM emissions. Excessive premixing can lead to high rates of pressure rise; EGR can be used to moderate the combustion under these conditions, without causing increased PM emissions. Reducing pilot quantity is another effective technique to reduce PM, primarily by allowing more air to mix with the gas jet before ignition. These various techniques can be combined to form a new operating strategy that significantly reduces engine-out PM and NOx emissions compared to the baseline strategy without significantly impacting fuel consumption.

Soot emission prediction in pilot ignited direct injection natural gas engine based on n-heptane/toluene/methane/PAH mechanism

Energy ◽  
2018 ◽  
Vol 163 ◽  
pp. 660-681 ◽  
Author(s):  
Menghan Li ◽  
Qiang Zhang ◽  
Xiaori Liu ◽  
Yuxian Ma ◽  
Qingping Zheng
Keyword(s):  
Natural Gas ◽  
Direct Injection ◽  
Soot Emission ◽  
Gas Engine ◽  
Natural Gas Engine

Lean-burn direct injection natural gas engine control for transient applications

2017 ◽  
pp. 37-57
Author(s):  
Panagiotis Katranitsas ◽  
Andrew Auld ◽  
Adam Gurr ◽  
Anthony Truscott
Keyword(s):  
Natural Gas ◽  
Direct Injection ◽  
Engine Control ◽  
Lean Burn ◽  
Gas Engine ◽  
Natural Gas Engine

Kinetic Study of the Ignition Process of Methane/n-Heptane Fuel Blends under High-Pressure Direct-Injection Natural Gas Engine Conditions

2020 ◽  
Vol 34 (11) ◽  
pp. 14796-14813
Author(s):  
Jingrui Li ◽  
Xinlei Liu ◽  
Haifeng Liu ◽  
Ying Ye ◽  
Hu Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Kinetic Study ◽  
Direct Injection ◽  
Ignition Process ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Fuel Blends

scholarly journals The effects of partially premixed combustion mode on the performance and emissions of a direct injection natural gas engine

Fuel ◽  
2019 ◽  
Vol 250 ◽  
pp. 218-234 ◽  
Author(s):  
Menghan Li ◽  
Xuelong Zheng ◽  
Qiang Zhang ◽  
Zhenguo Li ◽  
Boxiong Shen ◽  
...  
Keyword(s):  
Natural Gas ◽  
Direct Injection ◽  
Premixed Combustion ◽  
Combustion Mode ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Partially Premixed Combustion ◽  
Performance And Emissions ◽  
Partially Premixed

Experimental study of combustion strategy for jet ignition on a natural gas engine

2020 ◽  
pp. 146808742097775
Author(s):  
Ziqing Zhao ◽  
Zhi Wang ◽  
Yunliang Qi ◽  
Kaiyuan Cai ◽  
Fubai Li
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Efficient Points ◽  
Lean Burn ◽  
Gas Engine ◽  
Absolute Value ◽  
Natural Gas Engines ◽  
Natural Gas Engine ◽  
Excess Air ◽  
Lean Limit

To explore a suitable combustion strategy for natural gas engines using jet ignition, lean burn with air dilution, stoichiometric burn with EGR dilution and lean burn with EGR dilution were investigated in a single-cylinder natural gas engine, and the performances of two kinds of jet ignition technology, passive jet ignition (PJI) and active jet ignition (AJI), were compared. In the study of lean burn with air dilution strategy, the results showed that AJI could extend the lean limit of excess air ratio (λ) to 2.1, which was significantly higher than PJI’s 1.6. In addition, the highest indicated thermal efficiency (ITE) of AJI was shown 2% (in absolute value) more than that of PJI. Although a decrease of NOx emission was observed with increasing λ in the air dilution strategy, THC and CO emissions increased. Stoichiometric burn with EGR was proved to be less effective, which can only be applied in a limited operation range and had less flexibility. However, in contrast to the strategy of stoichiometric burn with EGR, the strategy of lean burn with EGR showed a much better applicability, and the highest ITE could achieve 45%, which was even higher than that of lean burn with air dilution. Compared with the most efficient points of lean burn with pure air dilution, the lean burn with EGR dilution could reduce 78% THC under IMEP = 1.2 MPa and 12% CO under IMEP = 0.4 MPa. From an overall view of the combustion and emission performances under both low and high loads, the optimum λ would be from 1.4 to 1.6 for the strategy of lean burn with EGR dilution.

Combustion characteristics of a direct-injection natural gas engine under various fuel injection timings

2006 ◽  
Vol 26 (8-9) ◽  
pp. 806-813 ◽  
Author(s):  
Ke Zeng ◽  
Zuohua Huang ◽  
Bing Liu ◽  
Liangxin Liu ◽  
Deming Jiang ◽  
...  
Keyword(s):  
Natural Gas ◽  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Characteristics ◽  
Gas Engine ◽  
Natural Gas Engine

116 Promotion of the Lean Combustion in a Natural-Gas Engine through Direct Injection of Hydrogen

2006 ◽  
Vol 2006.81 (0) ◽  
pp. _1-22_
Author(s):  
Yasuyuki NAKAI ◽  
Wataru ISHIKURA ◽  
Ali MOHAMMADI ◽  
Masahiro SHIOJI ◽  
Eizo TABO
Keyword(s):  
Natural Gas ◽  
Direct Injection ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Lean Combustion
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