A Lean Burn Gasoline Fueled Pre-Chamber Jet Ignition Combustion System Achieving High Efficiency and Low NOx at Part Load

2012 ◽  
Author(s):  
William P. Attard ◽  
Hugh Blaxill
Keyword(s):  
High Efficiency ◽  
Combustion System ◽  
Lean Burn ◽  
Part Load

Measurements and Modelling of a Lean Burn Gas Engine

1996 ◽  
Vol 210 (6) ◽  
pp. 449-462 ◽  
Author(s):  
C R Stone ◽  
K J S Mentis ◽  
M Daragheh
Keyword(s):  
Natural Gas ◽  
High Efficiency ◽  
Combustion Model ◽  
Hydrocarbon Emissions ◽  
Combustion System ◽  
Lean Burn ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Brake Mean Effective Pressure ◽  
Pressure Maximum

Natural gas is an alternative fuel that has potential for low emissions and a high efficiency. This paper presents the experimental results and predictions from a computer simulation of a fast burn high compression ratio (FBHCR) combustion system intended for use in a lean burn natural gas engine. Comparisons are made between the FBHCR combustion system at two compression ratios, predictions made by a two-zone combustion model and measurements from the original combustion system, for the brake efficiency, brake mean effective pressure, maximum cylinder pressure and the brake specific NOx emissions. Experimental measurements of the unburnt hydrocarbon emissions, the burn duration and the cycle-by-cycle variations in combustion are also discussed from the original and fast burn combustion systems. The results show how the conflicting aims of low emissions and low fuel consumption can be satisfied using a lean burn combustion system. The computer predictions are shown to be reliable, and thus suitable for estimating the performance of other engine builds.

Tumble Flow Measurements Using Three Different Methods and Its Effects on Fuel Economy and Emissions

2006 ◽  
Author(s):  
Myoungjin Kim ◽  
Sihun Lee ◽  
Wootae Kim
Keyword(s):  
Fuel Economy ◽  
High Performance ◽  
Gasoline Engine ◽  
Exhaust Emissions ◽  
Combustion Stability ◽  
Lean Burn ◽  
Flow Measurements ◽  
Part Load ◽  
Gasoline Engines ◽  
Dynamometer Test

In-cylinder flows such as tumble and swirl have an important role on the engine combustion efficiencies and emission formations. In particular, the tumble flow, which is dominant in-cylinder flow in current high performance gasoline engines, has an important effect on the fuel consumptions and exhaust emissions under part load conditions. Therefore, it is important to know the effect of the tumble ratio on the part load performance and optimize the tumble ratio of a gasoline engine for better fuel economy and exhaust emissions. First step in optimizing a tumble flow is to measure a tumble ratio accurately. In this research the tumble flow was measured, compared and correlated using three different measurement methods: steady flow rig, 2-Dimensional PIV, and 3-Dimensional PTV. Engine dynamometer test was performed to find out the effect of the tumble ratio on the part load performance. Dynamometer test results of high tumble ratio engine showed faster combustion speed, retarded MBT timing, higher exhaust emissions, and a better lean burn combustion stability. Lean limit of the baseline engine was expanded from A/F=18:1 to A/F=21:1 by increasing a tumble ratio using MTV.

Potential of Hydrogenated Vegetable Oil (HVO) in Future High Efficiency Combustion System

2013 ◽  
Vol 6 (1) ◽  
pp. 157-169 ◽  
Author(s):  
Om Parkash Bhardwaj ◽  
Andreas F. Kolbeck ◽  
Thomas Kkoerfer ◽  
Markku Honkanen
Keyword(s):  
Vegetable Oil ◽  
High Efficiency ◽  
Combustion System ◽  
Hydrogenated Vegetable Oil

scholarly journals Prechamber optimal selection for a two stage turbulent jet ignition type combustion system in CNG-fuelled engine

2019 ◽  
Vol 176 (1) ◽  
pp. 16-26 ◽  
Author(s):  
Ireneusz PIELECHA ◽  
Wojciech BUESCHKE ◽  
Maciej SKOWRON ◽  
Łukasz FIEDKIEWICZ ◽  
Filip SZWAJCA ◽  
...  
Keyword(s):  
High Speed ◽  
Internal Combustion Engines ◽  
Combustion Process ◽  
Optimization Methods ◽  
Turbulent Jet ◽  
Experimental Investigations ◽  
Combustion System ◽  
Two Stage ◽  
Lean Burn ◽  
High Speed Engine

Searching for further reduction of fuel consumption simultaneously with the reduction of toxic compounds emission new systems for lean-mixture combustion for SI engines are being discussed by many manufacturers. Within the European GasOn-Project (Gas Only Internal Combustion Engines) the two-stage combustion and Turbulent Jet Ignition concept for CNG-fuelled high speed engine has been proposed and thoroughly investigated where the reduction of gas consumption and increasing of engine efficiency together with the reduction of emission, especially CO2 was expected. In the investigated cases the lean-burn combustion process was conducted with selection of the most effective pre-combustion chamber. The experimental investigations have been performed on single-cylinder AVL5804 research engine, which has been modified to SI and CNG fuelling. For the analysis of the thermodynamic, operational and emission indexes very advanced equipment has been applied. Based on the measuring results achieved for different pre-chamber config-urations the extended methodology of polioptimization by pre-chamber selection and the shape of main chamber in the piston crown for proposed combustion system has been described and discussed. The results of the three versions of the optimization methods have been comparatively summarized in conclusions.

Effects of stroke on spark-ignition combustion with gasoline and methanol

2021 ◽  
pp. 146808742110396
Author(s):  
Christian Wouters ◽  
Patrick Burkardt ◽  
Marcus Fischer ◽  
Michael Blomberg ◽  
Stefan Pischinger
Keyword(s):  
Alternative Fuels ◽  
Internal Combustion Engines ◽  
High Efficiency ◽  
Combustion Velocity ◽  
Spark Ignition ◽  
Efficiency Gain ◽  
Lean Burn ◽  
Piston Speed ◽  
Long Stroke ◽  
Stroke Engine

Besides electrification of the powertrain, new synthetic alternative fuels with the potential to be produced from renewable sources come into focus. Methanol is the most elementary liquid synthetic fuel and no novelty for use in internal combustion engines. This article presents pathways to achieve high efficiency spark-ignition methanol combustion on a direct injection spark-ignition single-cylinder research engine with two different stroke-to-bore ratios (1.2 and 1.5) and a constant bore. In addition, two compression ratios (CRs) were investigated on each setup: CR = 10.8 using RON95 E10 gasoline fuel and a higher CR = 15 using neat methanol. In contrast to previous studies of stroke-to-bore ratio influences on SI combustion, this article aims at demonstrating how the advantages of a high stroke-to-bore ratio can be exploited by combining a long-stroke engine with increased compression ratios and methanol. The increased stroke enhances the tumble motion due to a higher piston speed and a larger compression volume which improves the mixture homogenization and combustion velocity. Moreover, the lower surface/volume ratio results in a reduced heat transfer. When using RON95E10 gasoline fuel and CR = 10.8, an efficiency gain of up to 1.6% could be achieved with the long-stroke compared to the short-stroke especially at lower engine loads. With methanol and CR = 15, an efficiency gain of up to 1.6% could be achieved with the long-stroke setup compared to the short-stroke engine. Subsequently, lean burn conditions were experimentally investigated with methanol and CR = 15. The longer stroke allowed the lean burn limit to be extended from λ = 1.9 to λ = 2.0 with an efficiency gain of up to 2.2%. A maximum indicated efficiency of 47.4% could be achieved at λ = 1.9 with methanol on the long-stroke engine with CR = 15.

Full Load and Part-Load Performance Prediction for Integrated SOFC and Microturbine Systems

2000 ◽  
Vol 122 (2) ◽  
pp. 239-246 ◽  
Author(s):  
Stefano Campanari
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electric Power ◽  
Performance Prediction ◽  
High Efficiency ◽  
Calculation Model ◽  
Solid Oxide ◽  
Small Scale ◽  
Oxide Fuel ◽  
Part Load ◽  
Small Capacity

During the last years, two new subjects among the others have raised interest in the field of small scale electric power generation: advanced microturbines and solid oxide fuel cells. This paper investigates the thermodynamic potential of the integration of the solid oxide fuel cell technology with microturbine systems, in order to obtain ultra-high efficiency small capacity plants, generating electric power in the range of 250 kW with 65 percent LHV net electrical efficiency and with the possibility of cogenerating heat. A detailed description of the calculation model is presented, capable of full and part-load performance analysis of the microturbine and of the integrated SOFC+microturbine system. [S0742-4795(00)01702-6]

CFD Aerodynamic and Reactive Study of an Innovative Lean Combustion System in the Frame of the NEWAC Project

2010 ◽  
Author(s):  
Alessandro Marini ◽  
Lorenzo Bucchieri ◽  
Antonio Peschiulli
Keyword(s):  
Numerical Procedure ◽  
Research Programme ◽  
Injection System ◽  
Combustion System ◽  
Lean Burn ◽  
The Core ◽  
Numerical Tests ◽  
Lean Combustion ◽  
Annular Combustor ◽  
The Eu

This paper deals with the very last activities carried out by EnginSoft in the frame of the EU funded research programme NEWAC. The work regards the pre-production numerical tests performed on the single annular combustor with the purpose of verify its performance in reactive frame. The core of this study is the innovative lean-burn injection system technology, developed by University of Karlsruhe and AVIO for medium OPR. Such device has been widely investigated in previous activities in order to optimise the combustor layout and the numerical procedure for this work [1].

New Type of Distributed Biomass Combustion Device Necessity and Feasibility in China

2011 ◽  
Vol 383-390 ◽  
pp. 4013-4016
Author(s):  
Chang Le Pang ◽  
Li Chen ◽  
Ren Jie Dong
Keyword(s):  
Rural Areas ◽  
High Efficiency ◽  
Low Cost ◽  
Biomass Combustion ◽  
Combustion System ◽  
Human Beings ◽  
New Type ◽  
Energy Products ◽  
The Ideal ◽  
Commercial Energy

Worldwide changes in climate and environment forced us human beings to seek for alternatives to replace commercial energy products like coal and petroleum. However, there have some difficulties to promote commercial energy products in China’s rural areas and newly urbanized areas. Biomass combustion system will become one of the ideal devices for such areas in a period of time. It is necessary to develop new types of biomass combustion system consisting of gasification or Semi-Gasification and combustion units so that it can provide high efficiency and low cost for household purposes.

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