Combustion Diagnostics & amp; Improvement of a Prechamber Lean-Burn Natural Gas Engine

2004 ◽  
Author(s):  
Yasuharu Kawabata ◽  
Daichi Mori
Keyword(s):  
Natural Gas ◽  
Lean Burn ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Diagnostics

Employing an Ionization Sensor for Combustion Diagnostics in a Lean Burn Natural Gas Engine

2001 ◽  
Author(s):  
Axel Franke ◽  
Patrik Einewall ◽  
Bengt Johansson ◽  
Raymond Reinmann
Keyword(s):  
Natural Gas ◽  
Lean Burn ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Diagnostics ◽  
Ionization Sensor

A Turbocharged Lean-Burn 4.3 Liter Natural Gas Engine

1995 ◽  
Author(s):  
Dan D. Giordano ◽  
Peter W. Petersen
Keyword(s):  
Natural Gas ◽  
Lean Burn ◽  
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

A high efficiency lean-burn mono‑fuel heavy‑duty natural‑gas engine for achieving Euro VI emissions legislation and beyond – part 2

2019 ◽  
pp. 135-158
Author(s):  
André Barroso ◽  
Andrew Auld ◽  
James Manuelyan ◽  
Matthew Keenan ◽  
Paolo Ferrero Giacominetto ◽  
...  
Keyword(s):  
Natural Gas ◽  
High Efficiency ◽  
Heavy Duty ◽  
Lean Burn ◽  
Gas Engine ◽  
Natural Gas Engine

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.

A Fundamental Study on Combustion Characteristics in a Pre-Chamber Type Lean Burn Natural Gas Engine

2019 ◽  
Author(s):  
Masashi Tanamura ◽  
Shintaro Nakai ◽  
Mahoko Nakatsuka ◽  
Shota Taki ◽  
Kohei Ozawa ◽  
...  
Keyword(s):  
Natural Gas ◽  
Combustion Characteristics ◽  
Lean Burn ◽  
Fundamental Study ◽  
Gas Engine ◽  
Natural Gas Engine

Effect of Port Gas Injection on the Combustion Instabilities in a Spark-Ignition Lean-Burn Natural Gas Engine

2018 ◽  
Vol 28 (10) ◽  
pp. 1850124
Author(s):  
Li-Yuan Wang ◽  
Li-Ping Yang ◽  
En-Zhe Song ◽  
Chong Yao ◽  
Xiu-Zhen Ma
Keyword(s):  
Natural Gas ◽  
High Frequency ◽  
Gas Injection ◽  
Low Frequency ◽  
Combustion System ◽  
Combustion Instabilities ◽  
Lean Burn ◽  
Engine Load ◽  
Gas Engine ◽  
Natural Gas Engine

The combustion instabilities in a lean-burn natural gas engine have been studied. Using statistical analysis, phase-space reconstruction, and wavelet transforms, the effect of port gas injection on the dynamics of the indicated mean effective pressure (IMEP) fluctuations have been examined at a speed of 800[Formula: see text]rpm and engine load rates of 25% and 50%. The excessive air coefficient is 1.6 for each engine load, and the port gas injection timing (PGIT) ranges from 1 to 120 degrees of crankshaft angle ([Formula: see text]CA) after top dead center (ATDC) of the intake process. The results show that the PGIT has a significant effect on cyclic combustion fluctuations and the dynamics of the combustion system for all studied engine loads. An unreasonable PGIT leads to increased combustion fluctuations, and loosened and bifurcated structures of combustion system attractors. Furthermore, for both low and medium engine loads, the IMEP time series at earlier gas injections ([Formula: see text]CA and [Formula: see text]CA ATDC) undergoes low-frequency fluctuation together with high-frequency fluctuations in an intermittent fashion. For other PGITs, high-frequency intermittent fluctuations become persistent combined with weak low-frequency oscillations. Our results can be used to understand the oscillation characteristics and the complex dynamics of combustion system in a lean-burn natural gas engine. In addition, they may also be beneficial to the development of more sophisticated engine control strategies.

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