Experimental Analysis of Retarding the Spark Timing in a Hydrogen Enriched Gasoline and Alcohol Blend Powered Spark Ignition Engine

2016 ◽  
Author(s):  
Monis Alam ◽  
Ashish Jaiswal ◽  
Jatin Agarwal ◽  
Ketan Yadav ◽  
Naveen Kumar
Keyword(s):  
Experimental Analysis ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Spark Timing

EXPERIMENTAL ANALYSIS OF THE INFLUENCE OF LUBRICATING OIL AND FUEL ON THE VIBRATION LEVEL OF CRANKSHAFT AXIS SPARK IGNITION ENGINE

2019 ◽  
Author(s):  
Claudio Santana ◽  
Jose Eduardo Mautone Barros ◽  
Juan Carlos Horta Gutiérrez ◽  
Helder Alves de Almeida Junior ◽  
jorgimara braga
Keyword(s):  
Experimental Analysis ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Lubricating Oil ◽  
Vibration Level

Development of a pre-ignition submodel for hydrogen engines

2005 ◽  
Vol 219 (10) ◽  
pp. 1203-1212 ◽  
Author(s):  
M A R Sadiq Al-Baghdadi
Keyword(s):  
Compression Ratio ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Superior Performance ◽  
Design Parameters ◽  
Operating Variables ◽  
Spark Timing ◽  
Hydrogen Engines ◽  
Intake Pressure

In hydrogen-fuelled spark ignition engine applications, the onset of pre-ignition remains one of the prime limitations that needs to be addressed to avoid its incidence and achieve superior performance. This paper describes a new pre-ignition submodel for engine modelling codes. The effects of changes in key operating variables, such as compression ratio, spark timing, intake pressure, and temperature on pre-ignition limiting equivalence ratios are established both analytically and experimentally. With the established pre-ignition model, it is possible not only to investigate whether pre-ignition is observed with changing operating and design parameters, but also to evaluate those parameters' effects on the maximum possible pre-ignition intensity.

Factors influencing the burn rate characteristics of a spark ignition engine with variable valve timing

2008 ◽  
Vol 222 (11) ◽  
pp. 2147-2158 ◽  
Author(s):  
F Bonatesta ◽  
P J Shayler
Keyword(s):  
Mass Fraction ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Spark Timing ◽  
Piston Speed ◽  
Flame Development ◽  
Variable Valve ◽  
Valve Overlap

The charge burn characteristics of a four-cylinder port-fuel-injected spark ignition engine fitted with a dual independent variable-valve-timing system have been investigated experimentally. The influence of valve timings on the flame development angle and the rapid burn angle is primarily associated with valve overlap values and internal gas recirculation. Conditions examined cover light to medium loads and engine speeds up to 3500r/min. As engine loads and speeds exceeded about 6bar net indicated mean effective pressure and 3000r/min respectively, combustion duration was virtually independent of the valve timing setting. At lower speeds and work output conditions, valve timing influenced burn angles through changes in dilution mass fraction, charge density, and charge temperature. Of these, changes in dilution mass fraction had the greatest influence. Increasing the dilution by increasing the valve overlap produced an increase in both burn angles. The effects of mean piston speed and spark timing have also been examined, and empirical expressions for the flame development and the rapid burn angles are presented.

Thermodynamic analysis of using ethanol-methanol-gasoline (GEM) blends in a turbocharged, spark-ignition engine

2021 ◽  
pp. 1-28
Author(s):  
Hongqing Feng ◽  
Shuwen Xiao ◽  
Zhirong Nan ◽  
Di Wang ◽  
Chaohe Yang
Keyword(s):  
Thermal Efficiency ◽  
Fossil Fuel ◽  
Spark Ignition ◽  
Exergy Efficiency ◽  
Spark Ignition Engine ◽  
Low Carbon ◽  
Si Engine ◽  
Engine Load ◽  
Maximum Value ◽  
Spark Timing

Abstract Low-carbon alcohols have been universally acknowledged as an alternative to fossil fuel in the world, which is environmentally friendly and clean. In this paper, the detailed exergy and energy analysis were carried out on a turbocharged, spark-ignition (SI) engine fueled with methanol-ethanol-gasoline (GEM) under non-knock conditions. The results indicated that increasing the alcohols proportion in blends could slightly improve the exergy efficiency and thermal efficiency and increase the percentage of total irreversibility in the total exergy. The thermal efficiency and exergy efficiency increased to a maximum value and then decreased, while the proportion of total irreversibility in the total exergy increased significantly with the spark timing retarded from the earliest timing. The exergy efficiency and thermal efficiency increased as the engine load increased. Additionally, the total irreversibility increased but the proportion of total irreversibility in the total exergy presented a trend of decreasing as the engine load increased.

Large-eddy simulation analysis of knock in a direct injection spark ignition engine

2018 ◽  
Vol 20 (7) ◽  
pp. 765-776 ◽  
Author(s):  
Anthony Robert ◽  
Karine Truffin ◽  
Nicolas Iafrate ◽  
Stephane Jay ◽  
Olivier Colin ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Simulation Analysis ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Eddy Simulation ◽  
Oscillation Analysis ◽  
Spark Timing ◽  
Large Eddy ◽  
Direct Injection Spark Ignition

Downsized spark ignition engines running under high loads have become more and more attractive for car manufacturers because of their increased thermal efficiency and lower CO2 emissions. However, the occurrence of abnormal combustions promoted by the thermodynamic conditions encountered in such engines limits their practical operating range, especially in high efficiency and low fuel consumption regions. One of the main abnormal combustion is knock, which corresponds to an auto-ignition of end gases during the flame propagation initiated by the spark plug. Knock generates pressure waves which can have long-term damages on the engine, that is why the aim for car manufacturers is to better understand and predict knock appearance. However, an experimental study of such recurrent but non-cyclic phenomena is very complex, and these difficulties motivate the use of computational fluid dynamics for better understanding them. In the present article, large-eddy simulation (LES) is used as it is able to represent the instantaneous engine behavior and thus to quantitatively capture cyclic variability and knock. The proposed study focuses on the large-eddy simulation analysis of knock for a direct injection spark ignition engine. A spark timing sweep available in the experimental database is simulated, and 15 LES cycles were performed for each spark timing. Wall temperatures, which are a first-order parameter for knock prediction, are obtained using a conjugate heat transfer study. Present work points out that LES is able to describe the in-cylinder pressure envelope whatever the spark timing, even if the sample of LES cycles is limited compared to the 500 cycles recorded in the engine test bench. The influence of direct injection and equivalence ratio stratifications on combustion is also (MAPO) analyzed. Finally, focusing on knock, a Maximum Amplitude Pressure Oscillation analysis (MAPO) is conducted for both experimental and numerical pressure traces pointing out that LES well reproduces experimental knock tendencies.

Effect of key parameters on knock suppression in a two-stroke spark ignition engine with aviation kerosene fuel

2019 ◽  
Vol 233 (8) ◽  
pp. 1047-1055
Author(s):  
Cheng Chang ◽  
Minxiang Wei
Keyword(s):  
Research Work ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Ignition Energy ◽  
Obvious Effect ◽  
Aviation Kerosene ◽  
Rich Mixture ◽  
Exhaust Temperature ◽  
Spark Timing ◽  
The Impact

This research work studies the impact of the mixture concentration, spark timing, and ignition energy on the knock suppression of a two-stroke spark ignition aviation kerosene-fueled engine. Bench tests on different working conditions were conducted and some related data including in-cylinder pressure, cylinder head temperature, exhaust temperature, engine power, and torque were collected to analyze the influence of different control parameters on the knock characteristics of the engine. The results show that the knock can be suppressed at leaner and richer (than the stoichiometric) mixtures, and the richer mixture has a more obvious effect on suppressing knock. Retarding the ignition advanced angle will reduce the knock intensity but will make the exhausted temperature exceed and the output power decrease. The use of a rich mixture with early spark timing has a better effect on the knock suppression as compared to the use of a lean mixture with late spark timing. Reducing the ignition energy can suppress the knock slightly, but experimental results show that it is not an effective way.

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