Experimental and numerical investigation of the effects of combustion chamber reentrant level on combustion characteristics and thermal efficiency of stoichiometric operation natural gas engine with EGR

2017 ◽  
Vol 123 ◽  
pp. 1473-1483 ◽  
Author(s):  
Bowen Yan ◽  
Laihui Tong ◽  
Hu Wang ◽  
Zunqing Zheng ◽  
Yufeng Qin ◽  
...  
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Numerical Investigation ◽  
Thermal Efficiency ◽  
Combustion Characteristics ◽  
Gas Engine ◽  
Natural Gas Engine

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

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

Air Fuel Dilution in a Pilot Ignited Direct Injection Natural Gas Engine: Pollutants, Performance, and System Level Considerations

2019 ◽  
Author(s):  
Aditya Prakash Singh ◽  
Gordon Patrick McTaggart-Cowan ◽  
Patrick Kirchen
Keyword(s):  
Natural Gas ◽  
Thermal Efficiency ◽  
High Pressures ◽  
Direct Injection ◽  
System Level ◽  
Engine Operation ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Fuel Dilution ◽  
The Impact

Abstract Dilution of natural gas fuel with air for use in a pilot ignited direct injection natural gas engine was investigated to evaluate the impact of this strategy on emissions and engine performance. A representative heavy-duty mode (mid to high-load at medium speed) was considered and the equivalence ratio (Φ) and exhaust gas recirculation (EGR) rates were varied from this representative mode. Air dilution resulted in a significant reduction in several pollutants: 90 to 97% reductions in black carbon particulate matter, 45 to 95% reductions in carbon monoxide, 68 to 85% reductions in total unburnt hydrocarbons. NOx emissions were found to increase by between 1.5 and 2.5x, depending on Φ and EGR, for a fixed combustion phasing. Beyond the emissions improvements, the gross indicated thermal efficiency increased by 2.5 percentage points at both high and low EGR rates. At higher EGR rates, this improvement was due to improved combustion efficiency, while the mechanism for efficiency improvement at lower EGR rates was unclear. The application of air-fuel dilution requires compressed air (> 300 bar) to mix with natural gas at high pressures. A system level analysis considered the compression power required by an industrial 3-stage reciprocating compressor and indicated that the gross indicated thermal efficiency improvements could compensate for the compression requirements for engine operation at high Φ.

scholarly journals Computational study of influence of inflow port channel design on spark-ignition natural gas engine parameters

2018 ◽  
Vol 245 ◽  
pp. 09001 ◽  
Author(s):  
Pavel Patsey ◽  
Yuriy Galyshev
Keyword(s):  
Kinetic Energy ◽  
Natural Gas ◽  
Combustion Chamber ◽  
Turbulent Kinetic Energy ◽  
Computational Study ◽  
Spark Ignition ◽  
Chemical Processes ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Physical And Chemical

Resistance is The article presents the results of the research of a charge swirl motion influence on working process, engine parameters and NOx emissions of a spark ignition premixed natural gas engine. The charge swirl motion was organized by tangential inflow channel. The engine work process research was performed using numerical modeling of physical and chemical processes in combustion chamber. The turbulent flow in combustion chamber, spark ignition and combustion of gas fuel were simulated. The simulation shows that a tangential channel allowed organizing a swirl motion of charge and increasing turbulent kinetic energy of flow in the combustion chamber. Swirl motion greatly affects the combustion process. The increase in the turbulent kinetic energy to the spark timing made it possible to substantially reduce the combustion time of the fuel. Replacement of one original channel by a tangential channel allowed reducing emissions of nitrogen oxides NOx. Physical and chemical processes in combustion chamber were simulated in Ansys Forte.

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