An investigation of multiple spark discharge using multi-coil ignition system for improving thermal efficiency of lean SI engine operation

2018 ◽  
Vol 212 ◽  
pp. 322-332 ◽  
Author(s):  
Dongwon Jung ◽  
Norimasa Iida
Keyword(s):  
Thermal Efficiency ◽  
Spark Discharge ◽  
Si Engine ◽  
Engine Operation ◽  
Ignition System

Characteristics of New Ignition Systems to Improve Engine Performance

1967 ◽  
Vol 182 (1) ◽  
pp. 15-24 ◽  
Author(s):  
By R. C. Teasel ◽  
R. D. Miller
Keyword(s):  
United States ◽  
Engine Performance ◽  
Spark Ignition ◽  
Spark Discharge ◽  
Spark Ignition Engine ◽  
Development Effort ◽  
Engine Operation ◽  
Discharge Characteristics ◽  
Ignition System ◽  
Spark Plug

The increasing use of spark ignition engines throughout the world has confronted the engine designer with new problems such as air pollution, world-wide temperature extremes, as well as legislative, economic, and human considerations. To meet these situations and improve the competitive position of the spark ignition engine requires considerable research and development effort. This paper reports on work conducted by Champion Spark Plug Company in attempting to evaluate the potential contribution that ignition system and spark plug designs can make towards improving spark ignition engine operation. Almost all the work reported here covers investigations in current large displacement United States passenger car engines. The three main characteristics of the overall ignition systems that are investigated are (1) the available output voltage characteristics of the ignition systems; (2) the effect of the ignition system spark discharge characteristics on engine performance; and (3) the effect of several spark plug design features on engine performance. This investigation shows that the inter-relationship of the ignition system spark discharge characteristics and the spark plug design requires that the overall evaluation must consider the dependence of both items. It also suggests that significant improvements can result in other United States and European engines, through the careful evaluation of ignition system and spark plug designs. The results of this work indicate that a fast rise time, short arc duration system results in reduced spark plug gap growth and better resistance to spark plug fouling. However, the arc duration must not be shorter than a minimum value, or a loss in engine performance may result. High output systems are desirable as they provide a higher voltage reserve to provide longer spark plug life, but the higher voltages that occur with the larger spark plug gaps can stress other ignition system components. The spark plug designs which incorporate a projection of the spark plug gap result in better performance in the engines tested, and possibly even reduce exhaust emissions. Certainly other features which engine manufacturers must consider, which are not discussed in detail here, are costs, durability, and maintenance of the new systems. At least one other important related problem is that of interference.

EGR Effects on Boosted SI Engine Operation and Knock Integral Correlation

2012 ◽  
Vol 5 (2) ◽  
pp. 547-559 ◽  
Author(s):  
Bjoern Hoepke ◽  
Stefan Jannsen ◽  
Emmanuel Kasseris ◽  
Wai K. Cheng
Keyword(s):  
Si Engine ◽  
Engine Operation

Numerical Studies of Novel Aero Engine Secondary Combustors for Low-NOx Emissions

2020 ◽  
Author(s):  
Andrew Rolt ◽  
Victor Martínez Bueno ◽  
Mirko Romanelli ◽  
Xiaoxiao Sun ◽  
Pierre Gauthier ◽  
...  
Keyword(s):  
Thermal Efficiency ◽  
Pressure Ratio ◽  
Flow Region ◽  
Nox Emissions ◽  
Low Oxygen ◽  
Engine Operation ◽  
Horizon 2020 ◽  
Novel Technologies ◽  
Numerical Studies ◽  
Aero Engine

Abstract Gas turbine thermal efficiency and fuel burn are very dependent on turbine entry temperature and overall pressure ratio (OPR). Unfortunately, increases in these two parameters compromise other key aspects of engine operation and tend to increase emissions of nitrogen oxides (NOx). The European Horizon 2020 ULTIMATE project researched advanced-cycle aero engines with synergistic combinations of novel technologies to increase thermal efficiency without increasing emissions. One candidate technology was the addition of secondary combustion to increase the mean temperature of heat addition to improve thermal efficiency while limiting the primary combustor flame temperatures and NOx formation. However, an overall reduction in NOx also requires the secondary combustor to be a low-NOx design. This paper describes numerical studies carried out on novel aero engine secondary combustor concepts developed in two MSc-thesis research projects. The studies have explored the potential of oxy-poor-flame combustion concepts. These annular combustor designs featured two distinct regions: (i) the vortex zone, which promotes recirculation of combustion products, a prerequisite for low-oxygen combustion, and (ii) a through-flow region where part of the incoming flow bypasses the vortex before the flows mix again. These studies have demonstrated the advantages and some limitations of the proposed designs and emissions assessments in comparison with previous secondary combustor studies. They suggest very low NOx is achievable with oxy-poor combustion, but will be more difficult if the incoming oxygen levels are above 10%. More-accurate assessments will require LES modelling and inclusion of the primary combustor in the simulations. However, if the low overall NOx emissions would include relatively higher levels of nitrous oxide (N2O) then this might raise concerns with respect to global warming.

scholarly journals Experimental Investigation of Using Ethanol-Gasoline in Spark Ignition Engine

2018 ◽  
Vol 21 (3) ◽  
pp. 368-373
Author(s):  
Kadhim Fadhil Nasir
Keyword(s):  
Spark Ignition Engine ◽  
Brake Specific Fuel Consumption ◽  
Si Engine ◽  
Pure Ethanol ◽  
Engine Operation ◽  
Brake Thermal Efficiency ◽  
Brake Power ◽  
Operation Parameter ◽  
Ethanol Addition ◽  
And Performance

The consequence of mixing pure ethanol with gasoline on the pollution and performance of SI engine are investigated experimentally in the existent study. The SI engine that employed in the experiment is a single cylinder four stroke. Analysis is carried out for engine operation parameter, CO2, CO and unburned HC productions. The measurements are recorded for several engine speeds from 1500 – 3000 rpm with load and ethanol addition of (0E, 10E, 20E, 30E, 40E, 50E,). The results displayed increasing in brake power, and brake thermal efficiency while the brake specific fuel consumption decreases when the ethanol- gasoline blends fuel increases. Also it was found that CO, HC, and CO2 concentrations decrease when the ethanol- gasoline increases. The best results obtained in the study is for the blend of E-50.

scholarly journals Use of the mathematical model of the ignition system to analyze the spark discharge, including the destruction of spark plug electrodes

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Sebastian Różowicz
Keyword(s):  
Mathematical Model ◽  
Experimental Studies ◽  
Fuel Mixture ◽  
Spark Discharge ◽  
Fuel Additives ◽  
Ignition System ◽  
Spark Plug ◽  
The Mathematical Model

Abstract The paper presents the results of analytical and experimental studies concerning the influence of different kinds of fuel additives on the quality of the spark discharge for different configurations of the ignition system. The wear of the spark plug electrode and the value of spark discharge were determined for various impurities and configurations of the air-fuel mixture.

Experiments and modeling of a dual-mode, turbulent jet ignition engine

2019 ◽  
Vol 21 (6) ◽  
pp. 966-986 ◽  
Author(s):  
Sedigheh Tolou ◽  
Harold Schock
Keyword(s):  
Experimental Data ◽  
Thermal Efficiency ◽  
Internal Combustion Engines ◽  
Peak Pressure ◽  
Operating Conditions ◽  
Turbulent Jet ◽  
Engine Fuel ◽  
Main Chamber ◽  
Dual Mode ◽  
Ignition System

The dual-mode, turbulent jet ignition system is a promising combustion technology to achieve high diesel-like thermal efficiency at medium to high loads and potentially exceed diesel efficiency at low-load operating conditions. The dual-mode, turbulent jet ignition systems to date proved a high level of improvement in thermal efficiency compared to conventional internal combustion engines. However, some questions were still unanswered. The most frequent question regarded power requirements for delivering air to the pre-chamber of a dual-mode, turbulent jet ignition system. In addition, there was no study available to predict the expected efficiency of a dual-mode, turbulent jet ignition engine in a multi-cylinder configuration. This study, for the first time, predicts the ancillary work requirement to operate the dual-mode, turbulent jet ignition system. It also presents a novel, reduced order, and physics-based model of the dual-mode, turbulent jet ignition engine with a pre-chamber valve assembly. The developed model was calibrated based on experimental data from the Prototype II dual-mode, turbulent jet ignition engine. The simulation results were in good agreement with the experimental data. The validity of the model was observed based on the standard metric of the coefficient of determination as well as comparison plots for in-cylinder pressures. Numerical predictions were compared to experiments for three metrics of main chamber combustion: gross indicated mean effective pressure, main chamber peak pressure, and main chamber phasing for the peak pressure. Predictions were within 5% of experimental data, with one exception of 6%. In addition, the absolute root mean square errors of in-cylinder pressures for both pre- and main-combustion chambers were below 0.35. The calibrated model was further studied to introduce a predictive and generalized model for dual-mode, turbulent jet ignition engines. Such a model can project engine behavior in a multi-cylinder configuration over the entire engine fuel map.

Sign in / Sign up

Export Citation Format

Share Document