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Ignition delay times were measured behind reflected shock waves in a shock tube for a wide variety of distillate fuels over a range of temperatures, pressures and mixtures. The fuels studied include: jet fuels (JP-5, JP-8, and Jet A), rocket propellants (RP-2), diesel fuels (F-76 and DF-2) and gasoline. A simple correlation was found to describe the ignition delay times for all these fuel/air experiments...
In this paper an experimental investigation on the heating experienced by the fuel when it expands through the calibrated orifices of a diesel injector is carried out. Five different geometries corresponding to the control orifices of two different commercial common-rail solenoid injectors were tested. An experimental facility was used to impose a continuous flow through the orifices by controlling...
Diesel-biodiesel-ethanol blends have been the focus of intense research quite recently. Diesel is a complex fuel composed of hundreds of compounds indicating the difficulty of using diesel for experimental studies associated with numerical simulations. Biodiesel is also a complex mixture of methyl esters. When injected in a diesel engine in the pure form, it induces changes in combustion behavior...
An experimental study was conducted on a four-cylinder diesel engine added with 0%, 10% and 30% 2,5-dimethylfuran (DMF). The combustion characteristic, nitric oxide (NOx) and particulate matter (PM) emissions under different fuel injection timing were measured and well discussed, especially the particle size distribution (PSD), particle number and mass concentration. The results indicated that the...
The nano-hybrid pour point depressants (PPDs) was prepared by organically modified nano-clay covering in polymeric PPDs, namely, polymethyl acrylate (PMA), ethylene vinyl acetate copolymer and poly-α-olefin. The effects of nano-hybrid PPDs on the cold flow properties of diesel fuel were evaluated. The crystal morphology and crystallization behavior of the diesel fuels in low-temperature were also...
How to remove the sulfone species formed in oxidative desulfurization (ODS) of middle distillates through an efficient method is crucial in a successful ODS process. In this study, the solubility of dibenzothiophene (DBT) sulfone in different hydrocarbon streams was assessed and investigated in detail, and the adsorptive removal of DBT-sulfone dissolved in a model hydrocarbon stream on activated carbon...
The most recent developments in the modelling of heating and evaporation of fuel droplets, the results of which were published in 2014–2017, are reviewed, and the most important unsolved problems are identified. Basic principles of power law and polynomial approximations and the heat balance method for modelling the heating of non-evaporating droplets are discussed. Several approaches to modelling...
Viscosity is one of the most important properties of biodiesel and conventional diesel fuels derived from petroleum. A large number of empirical correlations exist in the literature, which predict the blended viscosity of binary oil mixtures but they have not been proved for oil/oxygenate blends. In this work, twelve mixing rules, which were developed for predicting the viscosity of petroleum based...
Activated carbons chemically treated by steam and concentrated H2SO4, were used as adsorbents for removing organic sulfur compounds from a model diesel. The modified activated carbon was characterized by N2 sorption, base titration and FTIR spectroscopy. As compared with the untreated activated carbon, the treatment by a steam at 900°C increased the mesoporous volumes from 0.248 to 0.856cm3/g and...
The experiments on the ignition and combustion characteristics of diesel in air atmosphere (AA) and premixed methanol/air mixture atmosphere (MAA) were conducted in a constant volume combustion chamber (CVCC) equipped with a high pressure common-rail injection system. The ignition and combustion processes were recorded by a high-speed camera and a combustion pressure acquisition system. Results show...
We propose a modified phenomenological model for soot formation that occurs during the combustion process of diesel-biodiesel blends. The diesel-biodiesel blend is represented by three generic fuel groups: aromatic, aliphatic, and ester fuels, such that the aromatic content of the diesel fuel and the oxygen content of the biodiesel fuel are considered quantitatively. The soot formation is evaluated...
Kinematic viscosity and relative permittivity were determined in blends of soybean biodiesel with diesel fossil fuel in the full range of composition at temperatures between 298K and 318K (±0.1K).The kinematic viscosity as a function of temperature fits very satisfactorily to an Arrhenius dependence at all the compositions. The activation energy of this process depends linearly on blend composition...
Reactivity controlled compression ignition (RCCI) is one of representative dual-fuel combustion concepts for low NOx, soot emissions and high thermal efficiency. Overall lean and highly premixed auto-ignition combustion make low combustion temperature and the reduction of heat transfer loss. Although premixed compression ignition (PCI) combustion using a single fuel, i.e., diesel, also shows low emissions...
In the present study, combustion and emissions characteristics of a dual fuel engine has been investigated numerically. For numerical analysis, zero dimensional stochastic reactor model (0-D SRM) approach was used. SRM was validated with experimental results and used for parametric analysis of dual fuel engine by varying operating parameters such as premixing ratio of fuels, engine speed and exhaust...
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