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Viewing 241 to 270 of 184390
2016-10-27
Event
2016-10-27
Event
2016-10-27
Event
2016-10-27
Event
Today’s modern diesel engines are designed with efficiency and low emissions in mind. To achieve these objectives, fuel injection system pressures have moved up in excess of 2,000 BAR. These higher pressures drive the need for fuel cleanliness levels never seen before in order to “keep running and achieve more”, i.e. meet injector life and maintenance interval expectations. In order to achieve the levels of cleanliness now required, a two-step approach to filtration is needed. Onboard filtration alone will be challenged to meet the expected levels of efficiency and life due to limitations in dirt holding capacity and compromised performance in harsh on-engine environments. This presentation will explain why bulk fuel filtration, or filtering the fuel prior to being put into use on the equipment, should be an integral part of every operation’s contamination control strategy.
2016-10-27
Event
A review of the published literature on the ambient storage stability of B-X/ULSD blends will be presented. Then experimental results will be presented designed to test the hypothesis that the ambient storage stability of retail B-X/ULSD blends are dependent upon fuel dissolved oxygen concentration. Possible chemical mechanisms for the observed results will be proposed.
2016-10-27
Event
Shortly after the formation of a Deposit Panel within the Coordinating Research Council, CRC, Diesel Performance Group, the engine manufacturers approached the Panel and requested initiation of an urgent effort to evaluate the causes of a new internal injector deposit problem. Fuel / injector interaction studies would require a test tool. The panel identified several rigs, evaluated them, and concluded that the one developed by Delphi was able to discriminate among fuels. This report provides a detailed description of a follow up project to compare the Delphi rig test results to those generated by actual engines, Cummins and John Deere, to determine if this more practical shorter-duration test rig is able to predict injector sticking tendency of fuels, eliminating expensive longer-duration engine tests using very large diesel volume.
2016-10-27
Event
Internal deposits can appear in diesel, dual fuel vehicles and even in aircraft fuel circuit system and injectors. Deposits formation are often linked in the literature to fuels chemistry, hydrocarbons tendency to undergo thermal-oxidation process. Here, we present the IFPEN approach to study fuels degradation and deposits formation. Also, an important focus on the analytical tools to study the morphology and chemical composition of deposits formed by the different fuels, as well as their reactivity, the surface deposits-metals chemical bonds and deposits main chemical composition. Deposits formation into fuel liquid phase was compared to deposits formed direct in contact with a metallic surface. Results show that deposits precursors are nanoparticles, formed in the liquid phase. In the case of fuel stagnation over a metallic surface (soaking), the nanoparticles can form covalent bond with upper surface atoms and start the adhesion process.
2016-10-27
Event
Engine and FIE manufacturers are facing an increased number of complaints on abnormal engine functioning related to internal diesel injector deposits (IDID). Possible consequences are increased emissions, rough engine running and misfiring due to impairments in the timing of the injector, modified injection quantities or sticking injector needles. It is expected that the introduction of more complex injection strategies and highly accurate but sensitive injection components into future engine generations will exacerbate the risk of dysfunctioning. In order to understand the different processes implied, this work describes the basic mechanisms and influencing parameters on the formation of fuel related deposits. These results have been obtain from extensive experimental measurement campaigns, theoretical modelling of the fuel oxidation process and comparison with the literature.
2016-10-27
Event
This session focuses on fuel injection, combustion, controls, performance and emissions of SI engines fueled with gaseous fuels such as methane, natural gas (NG), biogas, producer gas, coke oven gas, hydrogen, or hydrogen-NG blends. Papers on Diesel-NG or diesel-hydrogen dual-fuel engines will also be accepted in this session.
2016-10-27
Event
2016-10-27
Event
As engine technology and particularly the fuel injection equipment have evolved to meet ever stricter emissions legislation, engines have become more sensitive to deposit formation resulting from changes in fuel quality. This makes it crucial that the structure of deposits arising from incomplete combustion and thermal conversion in high pressure injectors can be characterised in detail to understand their origins and formation. While there have been extensive studies on the polycyclic aromatic hydrocarbons (PAHs) and other hydrocarbons adsorbed on particulates, in comparison, the characterisation of the aromatic structure that constitutes the bulk of the organic matter in particulates has received less attention. A number of methods provide significant insight into the degree of condensation of the aromatic structure and the alignment of the aromatic structure, notably solid state 13C NMR, Raman, X-ray diffraction (XRD) and transmission electron microscopy (TEM).
2016-10-27
Event
2016-10-27
Event
Internal Diesel Injector Deposits (IDIDs) can be formed from metal carboxylate soaps, artificial low-MW succinimides, and fuel degradation due to extreme conditions within FIE. Shell has used acoustic cavitation (sonication) to model the hydrodynamic cavitation aspect of fuel degradation to IDID. Shell has also studied the effect of nozzle fouling on the structural characteristics of high pressure diesel sprays into either a water reservoir or a pressurised constant volume chamber. In the water reservoir study, fouling increased the spray cone angle by 10-140%. Fouling particularly affected the early stages of spray evolution, with the cycle-to-cycle variability of the cone angle being 2-3x greater when an injector was fouled, along with transient radial bulges which might reduce the axial momentum and affect combustion performance. In contrast, at the end of injection ligament and droplet formation were not affected by fouling.
2016-10-27 ...
  • October 27-28, 2016 (8:30 a.m. - 4:30 p.m.) - Baltimore, Maryland
Training / Education Classroom Seminars
Improving vehicular fuel efficiency is of paramount importance to the global economy. Governmental regulations, climate change and associated health concerns, as well as the drive towards energy independence, have created a technical need to achieve greater fuel efficiency. While vehicle manufacturers are focusing efforts on improved combustion strategies, smaller displacement engines, weight reduction, low friction surfaces, etc., the research involved in developing fuel efficient engine oils has been less publicized.
2016-10-27 ...
  • October 27-28, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Embedded hardware is everywhere you look today from your vehicle’s infotainment system to refrigerator to medical devices and everything else in-between. With so much exposure one would think that such devices are secure against attack; however, sadly for a large number of devices this is not the case. For proof, just look no further than your local news reports. They are full of reports on devices being hacked into. So, as engineers, how do we go about first identifying and mitigating (or capitalizing) the potential security vulnerabilities within these devices?
2016-10-26
Event
Viewing 241 to 270 of 184390

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