TY - JOUR
TI - Numerical study on a natural gas-fueled engine under low temperature combustion mode
AU - Kezrane Cheikh
AU - Naima Khatir
AU - Alsharari Abdulrhman M
AU - Al-Hameed Riyadh Mazin
AU - Zearah Sajad A
AU - Akgül Ali
AU - Abdullaeva Barno
AU - Menni Younes
AU - Asad Jihad
JN - Thermal Science
PY - 2023
VL - 27
IS - 4
SP - 3457
EP - 3466
PT - Article
AB - Natural gas, which is also referred to as eco-friendly fuel, is being seen as  a potential solution to challenge the decline of crude oil resources and  the deteriorating air quality in urban areas. This fuel has been verified  to emit less CO, HC, and PM compared to other fuels. A potential approach to  reducing NOx and soot emissions while also achieving low fuel consumption is  the low temperature combustion process. In this study, internal combustion  engines were simulated under various conditions. The objective was to  investigate the effect of different operating variables on the low  temperature combustion mode. To begin with, a natural gas powered engine was  modeled using complex chemical kinetics software. The outcomes of the  simulation were then compared to experimental data, demonstrating a high  level of agreement. Subsequently, the impacts of key variables, including  the air-fuel ratio, compression ratio, and engine speed, were analyzed using  a cycle simulation code. Increasing the compression ratio improves engine  performance, and the specific fuel consumption decreases. However, it leads  to a significant increase in NOx emissions until a certain value.  Thereafter, it changes the trend. Engine speed indirectly affects  performance by increasing fuel consumption and changing ignition timing. A  leaner air fuel ration may be used to produce more power and keep the  temperature of combustion below a certain value (low-temperature  combustion), ensuring low NOx emissions.