Abstract
Current energy and emission regulations set the requirements to increase the use of natural gas in engines for transportation and power generation. The characteristics of natural gas are high octane number, less amount of carbon in the molecule, suitable to lean combustion, less ignitibility, etc. There are some advantages of using natural gas for engine combustion. First, less carbon dioxide is emitted due to its molecular characteristics. Second, higher thermal efficiency is achieved owing to the high compression ratio compared to that of gasoline engines. Natural gas has higher octane number so that knock is hard to occur even at high compression ratios. However, this becomes a disadvantage in homogeneous charge compression ignition (HCCI) engines or compression ignition engines because the initial auto-ignition is difficult to be achieved. When natural gas is used in a diesel engine, primary natural gas–air mixture is ignited with small amount of diesel fuel. It was found that under high pressure, lean conditions, and with the control of certain parameters, the end gas is auto-ignited without knock and improves the engine combustion efficiency. Recently, some new fuel ignition technologies have been developed to be applied to natural gas engines. These are the laser-assisted and plasma-assisted ignition systems with high energy and compact size.
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Abbreviations
- ATDC:
-
After top dead center
- AFR:
-
Air–fuel ratio
- BTDC:
-
Before top dead center
- CA:
-
Crank angle
- CAD:
-
Crank angle degree
- CFD:
-
Computational fluid dynamics
- CI:
-
Compression ignition
- CNG:
-
Compressed natural gas
- CO:
-
Carbon monoxide
- CO2:
-
Carbon dioxide
- EVC:
-
Exhaust valve closing
- EVO:
-
Exhaust valve opening
- EGR:
-
Exhaust gas recirculation
- Ď• :
-
Equivalence ratio
- IMEP:
-
Indicated mean effective pressure
- IVC:
-
Intake valve close
- IVO:
-
Intake valve open
- HC:
-
Hydrocarbon
- HCCI:
-
Homogeneous charge compression ignition
- HRR:
-
Heat release rate
- IC:
-
Internal combustion
- LES:
-
Large Eddy simulation
- LTC:
-
Low-temperature combustion
- m DF :
-
Mass of pilot-injected diesel fuel
- NG:
-
Natural gas
- NO:
-
Nitrogen monoxide
- NOx:
-
Nitrogen oxides
- P:
-
Pressure
- PCCI:
-
Premixed charge compression ignition
- rpm:
-
Revolution per minute
- RANS:
-
Reynolds-averaged Navier–Stokes
- RCCI:
-
Reactivity controlled compression ignition
- SI:
-
Spark ignition
- SOC:
-
Start of combustion
- SOI:
-
Start of injection
- T:
-
Temperature
- T G :
-
Ignition temperature
- TDC:
-
Top dead center
- UHC:
-
Unburned hydrocarbon
- V:
-
Volume
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Azimov, U., Kawahara, N., Tsuboi, K., Tomita, E. (2019). Advanced Combustion in Natural Gas-Fueled Engines. In: Srinivasan, K., Agarwal, A., Krishnan, S., Mulone, V. (eds) Natural Gas Engines . Energy, Environment, and Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-13-3307-1_8
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