The effects of combustion duration on residual gas, effective release energy, engine power and engine emissions characteristics of the motorcycle engine

2019 ◽  
Vol 248 ◽  
pp. 54-63 ◽  
Author(s):  
Nguyen Xuan Khoa ◽  
Ocktaeck Lim
Keyword(s):  
Engine Emissions ◽  
Combustion Duration ◽  
Residual Gas ◽  
Motorcycle Engine ◽  
Engine Power

scholarly journals A Study to Investigate the Effect of Valve Mechanisms on Exhaust Residual Gas and Effective Release Energy of a Motorcycle Engine

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5564
Author(s):  
Nguyen Xuan Khoa ◽  
Ocktaeck Lim
Keyword(s):  
Simulation Model ◽  
Spline Approximation ◽  
Engine Performance ◽  
Research Data ◽  
Valve Mechanism ◽  
Experiment System ◽  
Cam Profile ◽  
Residual Gas ◽  
Motorcycle Engine ◽  
Engine Power

The purpose of this study was to investigate the effect of valve mechanisms on the exhaust residual gas (ERG) and effective release energy (ERE) of a motorcycle engine. Here, a simulation model and the estimation a new valve mechanism design is presented. An AVL-Boost simulation model and an experiment system were established. The classical spline approximation method was used to design a new cam profile for various valve lifts. The simulation model was used to estimate the effect of the new valve mechanism designs on engine performance. A new camshaft was produced based on the research data. The results show that the engine obtained a maximum engine brake torque of 21.53 Nm at 7000 rpm, which is an increase of 3.2% compared to the engine using the original valve mechanism. In addition, the residual gas was improved, the maximum engine effective release energy was 0.83 kJ, the maximum engine power was 18.1 kW, representing an improvement of 7.2%, and the air mass flow was improved by 4.97%.

Combustion and Emission Characteristics of a Diesel Engine Working With Diesel/Jojoba Biodiesel/Higher Alcohol Blends

2020 ◽  
Author(s):  
Ahmed I. EL-Seesy ◽  
Mohamed Nour ◽  
Tiemin Xuan ◽  
Zhixia He ◽  
Hamdy Hassan
Keyword(s):  
High Viscosity ◽  
Higher Alcohols ◽  
Engine Emissions ◽  
Nox Formation ◽  
Higher Alcohol ◽  
Mechanical Dispersion ◽  
Combustion Duration ◽  
Ci Engine ◽  
Biodiesel Blend ◽  
Ci Engines

Abstract The main concerns of utilizing jojoba biodiesel in CI engines is that it has a high viscosity and high NOx formation. Therefore, this article purposes in endeavoring to improve the combustion and emission parameters of a CI engine working with diesel/jojoba biodiesel blend and higher alcohols under various engine loads. The higher alcohols typically are n-butanol, n-heptanol, and n-octanol, which are combined with 50% diesel, 40% of jojoba biodiesel at a volume portion of 10%, and they are designated as DJB, DJH, and DJO respectively. The jojoba biodiesel is manufactured via a transesterification process with facilitating mechanical dispersion. The findings display that there is a drop in pmax and HRR for DJB, DJH, and DJO blends compared to pure diesel fuel, whereas the combustion duration and ignition delay are extended. The brake specific fuel consumption is enlarged. Concerning engine emissions, the NOx formation is reduced while the CO, UHC, and soot emissions are increased for DJB, DJH, and DJO mixtures. It can be deduced that combining high fractions of jojoba biodiesel with C4, C7, and C8 alcohols have the feasible to accomplish low NOx formation in the interim having high thermal efficiency level.

A Simulation Model of a Four-Stroke Spark Ignition Engine Fueled With Landfill Gases

2007 ◽  
Author(s):  
Guruprasath Narayanan ◽  
S. O. Bade Shrestha
Keyword(s):  
Simulation Model ◽  
Landfill Gas ◽  
Combustion Products ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Performance Parameters ◽  
Combustion Duration ◽  
Hydrogen Mixtures ◽  
Residual Gas ◽  
Gas Properties

A simulation model for establishment of performance parameters of a spark ignition engine fueled with landfill gas-methane and landfill gas-hydrogen mixtures is described. A two zone model was employed to estimate combustion duration, ignition lag, associated mass burning rates and performance parameters for various operating conditions in an internal combustion engine. The modeling consists of two main modules: a) a fuel-air and residual gas properties calculation, and b) equilibrium combustion product properties calculation with 13 species of equilibrium combustion products. The fuel-air and residual gas module calculates gas properties required in compression stroke and in an unburned zone of a combustion chamber. The equilibrium combustion products module calculates gas properties for the burned zone during combustion and expansion phases. In addition to engine parameters, combustion duration estimation methods were presented to accommodate the presence of high quantities of diluents such as carbon dioxide and nitrogen in methane to represent landfill gases, generally encountered in practice. Similarly, an effect of addition of hydrogen in landfill gas on performance of a spark ignition engine was also incorporated in the model. The pressure traces and other engine output parameters were modeled and compared with the experimental observations obtained in a variable compression single cylinder four-stroke spark ignition Co-operative fuel research (CFR) engine for different fuels that include methane, landfill gas and landfill gas–hydrogen mixtures and found satisfactory agreement. Matlab was used as the programming software in the model.

scholarly journals The Influence of Hydrogen on Vaporization, Mixture Formation and Combustion of Diesel Fuel at an Automotive Diesel Engine

2020 ◽  
Vol 13 (1) ◽  
pp. 202
Author(s):  
Alexandru Cernat ◽  
Constantin Pana ◽  
Niculae Negurescu ◽  
Gheorghe Lazaroiu ◽  
Cristian Nutu
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Operating Regime ◽  
Hydrogen Addition ◽  
Zonal Model ◽  
Fuel Droplets ◽  
Combustion Duration ◽  
And Performance ◽  
Autoignition Delay ◽  
Engine Power

Hydrogen can be a viable alternative fuel for modern diesel engines, offering benefits on efficiency and performance improvement. The paper analyses the results of a thermodynamic model developed by authors in order to study the influence of Hydrogen addition on a process like vaporization, mixture forming, and combustion at the level of diesel fuel droplets. The bi-zonal model is applied for a dual-fueled diesel engine K9K type designed by Renault for automotives. For the engine operating regime of 2000 rpm speed and 55% engine load, the diesel fuel is partially substituted by Hydrogen in energetic percents of 6.76%, 13.39%, and 20.97%, the engine power being maintained at the same level comparative to classic fueling. At Hydrogen addition, the diesel fuel jets atomization and diesel fuel droplets vaporization are accelerated, the speed of formation of the mixture being increased. Comparative to classic fueling, the use of Hydrogen leads to diesel droplets combustion intensification, with a shortened autoignition delay, reduction of combustion duration, and increase of flame radius.

scholarly journals Combustion duration influence on hydrogen-ethanol dual fueled engine emissions: An experimental analysis

2018 ◽  
Vol 9 (2) ◽  
pp. 41
Author(s):  
Syed Yousufuddin
Keyword(s):  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Experimental Results ◽  
Compression Ignition Engine ◽  
Engine Emissions ◽  
Combustion Duration ◽  
Hc Emissions ◽  
Duration Effect ◽  
Engine Emission ◽  
Hydrogen Substitution

The research presented in this article expresses experimental results on combustion duration effect on the dual fueled engine. In particular, the research was focused on the emissions occurred specifically from a hydrogen-ethanol dual fueled engine. This study was performed on a compression ignition engine that was converted to run and act as a spark ignition engine. This modified engine was fueled by hydrogen–ethanol with various percentage substitutions of hydrogen. The substitution was altered from 20 to 80% at a constant speed of 1500 rpm. The various engine emission characteristics such as CO, Hydrocarbon, and NOx were experimentally determined. This study resulted that at a compression ratio of 11:1 and combustion duration of 25°CA, the best operating conditions of the engine were shown. Moreover, the optimum fuel combination was established at 60 to 80% of hydrogen substitution to ethanol. The experimental results also revealed that at 100% load and at compression ratios 7, 9, and 11; the CO and HC emissions have decreased while NOx increased and followed with the increase in the percentage of hydrogen addition and combustion duration. It was concluded that the retarding combustion duration was preferred for NOx emission control in the engine.

Lubricant Base Oil Effects on Motorcycle Engine Power

2008 ◽  
Author(s):  
Michael E. Webb ◽  
Curt M. Beloy
Keyword(s):  
Base Oil ◽  
Motorcycle Engine ◽  
Engine Power
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