Influence of Compression Ratio and Ignition Timing on the Performance of LPG Fuelled SI Engine

2013 ◽  
Author(s):  
Shailendra M Lawankar
Keyword(s):  
Compression Ratio ◽  
Ignition Timing ◽  
Si Engine

Energy and exergy analyses of a hydrogen fueled SI engine: Effect of ignition timing and compression ratio

Energy ◽  
2019 ◽  
Vol 175 ◽  
pp. 410-422 ◽  
Author(s):  
Yasin Şöhret ◽  
Habib Gürbüz ◽  
İsmail Hakkı Akçay
Keyword(s):  
Compression Ratio ◽  
Ignition Timing ◽  
Si Engine ◽  
Energy And Exergy ◽  
Exergy Analyses

The Development of Combustion Strategy in Improving the Performances of SI-PFI Engine Using E50 of Gasoline-Bioethanol Fuel Blend

2021 ◽  
pp. 115-135
Author(s):  
M. Paloboran ◽  
H. Syam ◽  
M. Yahya ◽  
Darmawang
Keyword(s):  
Linear Programming ◽  
Compression Ratio ◽  
Engine Speed ◽  
Standard Condition ◽  
Spark Ignition Engine ◽  
Ignition Timing ◽  
Fuel Blend ◽  
Non Linear Programming ◽  
Non Linear ◽  
Bioethanol Fuel

This research aims to improve the combustion performance of gasoline-bioethanol fuel blended in the ratio of 50:50 (E50) on the spark-ignition engine by employing a new combustion strategy. The Box Behnken Design of Response Surface Methodology and Non-Linear Programming was employed to optimize the performance of the engine and create some engine parameters. The performance of the engine consists of power, torque, thermal efficiency, fuel consumption, and the emission of CO and HC, while the engine and combustion parameters are compression ratio, ignition timing, and engine speed. A new combustion strategy will be applied in this study with a tiered mapping process for each engine parameter based on the MBT. The brake torque increased by 13.5 % while HC and CO emissions decreased by 15 % and 71 % respectively when the combustion strategy applied if compared o the pure gasoline in engine standard condition. Furthermore, the BSFC increased by 33 % while BTE decreased by 15 % towards the gasoline fuel. The non-linear programming applied in this study intended to figure out the best combination of the engine parameters in obtaining optimum engine performances. In the RSM analysis, the codes --1, 0, 1 represented 12, 12.5, and 13 of compression ratio, 16, 20, and 24 BTDC of ignition timing and 2000, 5000, and 8000 rpm of engine speed. Therefore, 20 BTDC of ignition timing and 13:1 of compression ratio is the optimum engine parameters used in gaining the optimal performance of the engine when E50 runs in SI-PFI engine of 150 cm3

scholarly journals Parametric Knocking Performance Investigation of Spark Ignition Natural Gas Engines and Dual Fuel Engines

2020 ◽  
Vol 8 (6) ◽  
pp. 459 ◽  
Author(s):  
La Xiang ◽  
Gerasimos Theotokatos ◽  
Haining Cui ◽  
Keda Xu ◽  
Hongkai Ben ◽  
...  
Keyword(s):  
Natural Gas ◽  
Compression Ratio ◽  
Engine Performance ◽  
Spark Ignition ◽  
Combustion Model ◽  
Dual Fuel ◽  
Ignition Timing ◽  
Natural Gas Engines ◽  
Study Results ◽  
Pilot Fuel

Both spark ignition (SI) natural gas engines and compression ignition (CI) dual fuel (DF) engines suffer from knocking when the unburnt mixture ignites spontaneously prior to the flame front arrival. In this study, a parametric investigation is performed on the knocking performance of these two engine types by using the GT-Power software. An SI natural gas engine and a DF engine are modelled by employing a two-zone zero-dimensional combustion model, which uses Wiebe function to determine the combustion rate and provides adequate prediction of the unburnt zone temperature, which is crucial for the knocking prediction. The developed models are validated against experimentally measured parameters and are subsequently used for performing parametric investigations. The derived results are analysed to quantify the effect of the compression ratio, air-fuel equivalence ratio and ignition timing on both engines as well as the effect of pilot fuel energy proportion on the DF engine. The results demonstrate that the compression ratio of the investigated SI and DF engines must be limited to 11 and 16.5, respectively, for avoiding knocking occurrence. The ignition timing for the SI and the DF engines must be controlled after −38°CA and 3°CA, respectively. A higher pilot fuel energy proportion between 5% and 15% results in increasing the knocking tendency and intensity for the DF Engine at high loads. This study results in better insights on the impacts of the investigated engine design and operating settings for natural gas (NG)-fuelled engines, thus it can provide useful support for obtaining the optimal settings targeting a desired combustion behaviour and engine performance while attenuating the knocking tendency.

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