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The Use of HCCI Combustion in a CFR Engine to Understand Fuel Behavior

2018-10-10
The CFR engine is the standard to extract fuel autoignition tendency. The ASTM standard gives two numbers, Research Octane Number, RON, and Motor Octane Number, MON. The RON was defined 1928 and the MON slightly later. In both cases two reference fuels are used, Iso-octane (100) and n-heptane (0) and the engine compression ratio is increased until a certain level of knock is registered with a special microphone. The problem with this set-up is that the pressure and temperature path for the end gas will vary with the more or less stochastic SI flame propagation. An alternative way to rate fuel is replace the SI combustion with additional piston compression and switch to HCCI combustion. We can thus introduce a HCCI number equivalent of RON by running the engine at the same conditions (600rpm and 52°C inlet temperature).
Event

Impingement, Adhesion, and Vaporization on Cylinder Liners with Post Fuel Injection

2018-10-10
Post fuel injection during the expansion stroke is applied to remove particulate matter accumulating on the DPF. However, it is reported that the post fuel injection is a cause of lubricant oil dilution and that it worsens the fuel consumption. In this research, the impingement, adhesion, and vaporization of post diesel fuel injections on the cylinder liner were investigated by an optical method with a high temperature-pressure constant volume chamber. The weights of adhered fuel on the cylinder wall, piston top, and piston-cylinder crevice were measured by a precision balance. The experiments were conducted under different conditions of post fuel injection with multiple fuel injections, and optimum post fuel injection strategies are discussed.
Event

Fuel Property and Modification for Partially Premixed Combustion (PPC)

2018-10-10
The effects of fuel properties on engine performance and emissions with PPC combustion mode have been investigated, The fuel properties include cetane number, oxygen content, molecular structure, volatility and viscosity etc. In order to modify the fuel property, the new alternative fuels were added to regular fuel (diesel/gasoline), such as Polyoxymethylene dimethyl ethers (PODE), 2,5-dimethyl furan (DMF) and n-butanol etc. The performance and emissions have been investigated with PPC fueled with the blend fuels. The results show that fuel property modification can improve the PPC performance and reduce the pollutant emissions, but it is necessary to control the engine boundary conditions to compensate in different engine load mode.
Event

Keynote Presentation Chemistry Matters Advanced Biofuels for Internal Combustion Engines

2018-10-09
In this presentation, an overview of the work in the Cluster of Excellence Tailor-made Fuels from Biomass (TMFB) will be provided. TMFB was a twelve-year project funded by the German government aiming at two main goals: First, the development of fuel molecules based on a systematic fuel design process that jointly optimizes fuel production in terms of cost, energy, and carbon footprint and associated engine performance in terms of engine efficiency, emissions, and other properties. A specific focus will be on combustion chemistry and its impact on auto-ignition, pollutant formation, and engine performance.
Event

Keynote Presentation From Alternatives to Alternatives – A paradox

2018-10-10
A refiner’s perspective on future transportation, future fuels and alternative fuels. An objective examination into how policy, stakeholder’s interests and technology intersect to shape the future of mobility. A look into the ongoing dynamics and dilemmas of the Renewable Fuels Standard (RFS), Corporate Average Fuel Economy (CAFE), EV’s, petroleum and alternative fuels and the differing positions of the key stakeholders involved in shaping policy.
Event

Fuel Requirements and Selection for Compression Ignition Engines

2018-10-10
Automotive combustion engines are facing big challenges from the tightening of greenhouse gas and harmful emission regulations around the world. There are two main combustion modes of spark ignition (SI) and compression ignition (CI) for internal combustion engines. The CI mode demonstrates higher thermal efficiency than the SI mode, but current diesel fuel is not the best fuel for the CI mode. This presentation discusses the requirements of fuel physicochemical properties for CI engines, and shows the benefits of different fuels including low octane gasoline like fuels, blended fuels of diesel with gasoline, oxygenated fuels applied on CI engines in terms of thermal efficiency, combustion characteristics and exhaust emissions. It can be concluded that a high efficiency and clean combustion can be realized by co-optimizing fuels and engines.
Event

Fuel Considerations for Advanced Internal Combustion Engines

2018-10-09
Improving internal combustion engine performance, efficiency, and emissions by leveraging fuel properties to produce optimal combustion processes is examined across a variety of engine platforms and combustion modes. Recent progress in fuel-engine matching for light-duty spark-ignition engines, light-duty gasoline compression-ignition engines, and a heavy-duty gasoline compression-ignition engine will be reviewed. For spark-ignition engines, fuel effects on knock, preignition, onboard reforming, and turbulent-jet ignition were explored. For compression-ignition engines, a path toward low NOx and particulate matter combustion has been demonstrated with various fuel formulations. These results show a tradeoff between combustion robustness and low emissions, with certain fuels providing an optimal balance between both factors.
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