Download or read book A Numerical Study of the Impacts of Volatile Component Blending on Diesel Spray Evaporation and Combustion written by and published by . This book was released on 2002 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multiphase computational fluid dynamics (CFD) code is used to simulate the evaporation and combustion processes of a diesel spray blended with a highly volatile component. The CFD code uses an Eulerian approach to model the liquid phase of diesel fuel with components of different boiling temperatures. The approach divides the droplets into size groups and assigns different boiling temperatures for each group. The CFD code accounts for liquid droplet flow, turbulent mixing, interfacial drag and heat transfer, droplet evaporation and combustion, radiation heat transfer, and pollutant kinetics. Using the code, a parametric study was conducted to investigate the impacts of a volatile component on the spray evaporation and combustion characteristics. The results indicate that the blending of a highly volatile component can have an impact on droplet evaporation rate and that thermal radiation is significant in spray combustion due to the formation of soot.
Download or read book A Numerical Study of the Transient Evaporating Spray Mixing Process in the Diesel Environment written by T.-W. Kuo and published by . This book was released on 1983 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Numerical Study on Diesel Spray Characteristics and Combustion Process written by Özgür Oğuz Taşkıran and published by . This book was released on 2011 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heating and Evaporation of Multi Component Fuel Droplets written by Mansour Al Qubeissi and published by BoD – Books on Demand. This book was released on 2015-08-01 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book documents pioneering mathematical models introduced for the simulation of multi-component droplets heating and evaporation processes which are implementable into commercial CFD codes. These models, described as 'multi-dimensional quasi discrete' (MDQD) and 'discrete-component' models, were applied to automotive fuel droplets in experimentally measured internal combustion engine conditions for biodiesel, diesel, and gasoline fuels. For instance, it is shown that the suggested models lead to accurate predictions of temperatures and evaporation times in typical diesel and gasoline engine conditions. Such models have also reduced CPU time about 85% compared with cases when classical approaches are used.
Download or read book Ignition Quality and Composition of Fuel Volatile Fraction written by Robert E. Bair and published by . This book was released on 1989 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study of Transient Fuel Sprays with Autoignition and Combustion Under Diesel Engine Relevant Conditions written by Yuepeng Wan and published by . This book was released on 1997 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AN EXPERIMENTAL AND COMPUTATIONAL STUDY OF FUEL SPRAY INTERACTION written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : An efficient spray injection results in better vaporization and air-fuel mixing, leading to combustion stability and reduction of emissions in the internal combustion (IC) engines. The impingement of liquid fuels on chamber wall or piston surface in IC engines is a common phenomenon and fuel film formed in the spray-piston or cylinder wall impingement plays a critical role in engine performance and emissions. Therefore, the study of the spray impingement on the chamber wall or position surface is necessary. To understand the spray-wall interaction, a single droplet impingement on a solid surface with different conditions was first examined. The droplet-wall interaction outcomes, in particular focusing on the splashing criteria, were inspected and post-impingement characterizations including spreading factor, height ratio, contact line velocity, and dynamic contact angle was further analyzed based on the experimental data. The non-evaporation volume of fluid (VOF) model based on Eulerian approach was used to characterize single droplet impinging on the wall and provide a better understanding of the dynamic impact process. In addition, the study of droplet-to-droplet collision and multi-droplet impingement on a solid surface are performed, which is essential to aid in the spray-wall impingement investigation. As well, due to the evaporation drawing more attention during the engine combustion process, an evaporation VOF sub-model was developed and applied to multi-droplet impingement on a hot surface to qualitatively and quantitatively analyze the vaporizing process as droplets impacting onto the hot surface. After that, the non-vaporizing and vaporizing spray characteristics of spray-wall impingement at various operating conditions relevant to diesel engines were undertaken, with spray characterized using schlieren and Mie scattering diagnostics, as well as Refractive Index Matching (RIM) technique. Free and impinged spray structures and deposited wall-film formation and evaporation were qualitatively analyzed, spray properties and wall-film properties were quantified, and surface temperature and heat flux were measured. An Eulerian-Lagrangian modeling approach was employed to characterize the spray-wall interactions by means of a Reynolds-Averaged Navier-Stokes (RANS) formulation. The local spray characteristics in the vicinity of the wall and the local spray morphology near the impingement location were studied. Furthermore, multiple spray-to-spray collision derived from droplet-to-droplet collision, considering as one of the advanced injection strategies to enhance the engine performance, was studied at various gasoline engine conditions to explore the effect of colliding spray on spray related phenomena like atomization, vaporization, and mixing. Spray characteristics were obtained by the schlieren diagnostics and the experimental validated Computational Fluid Dynamic (CFD) simulations were based on Eulerian-Lagrangian approach to understand the mechanism behind the collisions of sprays and characterize the different types of multiple spray-to-spray collision. In summary, on the strength of the study of droplet-wall impingement and droplet-to-droplet collision at non-evaporation and evaporation states, the main objective of this dissertation is to enhance the understanding of spray-wall impingement and multiple spray-to-spray collision under diesel or gasoline engine conditions from both experiments and CFD simulations, therefore providing feedbacks to the ultimate task in future development and application of a more reliable and effective fuel injection system.
Download or read book Numerical Study on Vaporization and Burning of Multi component Stationary Fuel Droplets and Single component Convective Fuel Droplets Both with Complex Configuration and Variable Properties written by Guang Wu and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diesel Technology written by National Research Council (U.S.). Diesel Impacts Study Committee. Technology Panel and published by National Academies. This book was released on 1982 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Porous Media in Homogenizationof Diesel Fuel Spray Combustion written by Seyed Navid Shahangian and published by . This book was released on 2015 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion homogenization of a fuel spray utilizing porous media (PM) has only recently been proposed and can be regarded as an untouched area of research. In this PhD program, the fundamental role of porous ceramic media on homogenization process of high pressure diesel fuel spray will be evaluated in diesel engine-like condition. In the study of high pressure diesel fuel spray combustion in presence of porous media, two main questions can be posed; what is the effect of porous media on fuel and air mixing process? How can porous media homogenize the diesel fuel spray combustion process? To answer these questions, cold (non-evaporating spray) and hot (combusting spray) experiments were conducted in a constant-volume chamber. Through the application of ultra-high speed imaging (UHSI) technique for cold flow experiment and developed image processing techniques, new insight into the transient nature of the fuel spray in different phases of spray interaction with a porous medium was gained. Besides developing a code for investigating the macroscopic characteristic parameters of the spray, a code was also developed to process the images for evaluating the probability density function (PDF) of the light intensity. Through PDF analysis, a discernible improvement of multijet dispersion and fuel atomization at higher chamber pressures in the last phase of spray interaction with the porous medium was achieved, irrespective of the injection pressure. This was interpreted as having a higher chance of uniform fuel distribution and a well homogenized mixture preparation for the combustion process, the first requirement for combustion homogenization, in both conventional as well as new diesel engine combustion concepts such as low temperature combustion (LTC). The combustion experiments were then conducted to shed light on the combustion characteristics of diesel spray in the presence of a porous medium with specific emphasis on combustion visualization and heat release analysis of the burning spray. Combustion imaging results showed the validity of the previous hypothesis gained from PDF analysis of cold flow results by showing the rapid development of homogenous combustion in the last phase of fuel interaction with the PM. Similar to the results of LTC combustion with retarded injection timing, a longer ignition delay, with a flatter and wider heat release rate pattern, compared to conventional diesel combustion, was observed in this study indicating the potential of PM assisted combustion in simultaneous reductions in soot and NOx emissions. Although more extensive experimentation will be required to determine performance over a wider range of conditions, these results suggest that porous media could be used to promote a distributed fuel air mixture resulting in slower, but more homogeneous heat release within the cylinder of an engine. The thesis provides detailed information for the experimental methodology developed in the Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) at Monash University.
Download or read book Cumulative Index of The SAE Papers written by Society of Automotive Engineers and published by . This book was released on 1965 with total page 1646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diesel Spray Mixing Limited Vaporization with Non ideal and Multi component Fuel Thermophysical Property Effects written by Jaclyn Elyse Nesbitt and published by . This book was released on 2011 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental and Computational Study of Fuel Injection Mixing and Combustion in Diesel Engines written by Laura M. Ricart and published by . This book was released on 1998 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical study to investigate the influence of blends domestic biodiesel diesel and fuel temperatures on fuel injection characteristics under several operating regimes written by Breda Kegl and published by . This book was released on 2006 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Liquid Sprays and Flow Studies in the Direct Injection Diesel Engine Under Motored Conditions written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-10 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two dimensional, implicit finite difference method of the control volume variety, a two equation model of turbulence, and a discrete droplet model were used to study the flow field, turbulence levels, fuel penetration, vaporization, and mixing in diesel engine environments. The model was also used to study the effects of engine speed, injection angle, spray cone angle, droplet distribution, and intake swirl angle on the flow field, spray penetration and vaporization, and turbulence in motored two-stroke diesel engines. It is shown that there are optimum conditions for injection, which depend on droplet distribution, swirl, spray cone angle, and injection angle. The optimum conditions result in good spray penetration and vaporization and in good fuel mixing. The calculation presented clearly indicates that internal combustion engine models can be used to assess, at least qualitatively, the effects of injection characteristics and engine operating conditions on the flow field and on the spray penetration and vaporization in diesel engines. Nguyen, Hung Lee and Carpenter, Mark H. and Ramos, Juan I. and Schock, Harold J. and Stegeman, James D. Glenn Research Center; Langley Research Center...
Download or read book Numerical Investigation on the Spray and Combustion Characteristics of Diesel with Oxygenated Fuel Additives written by Yicheng Chi and published by . This book was released on 2016 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
