| dc.description.abstract | The computer simulation for spray and combustion of an internal combustion engine
represents a major challenge as new technologies and systems that seek reduction of fuel
consumption and lower emissions. New technologies such as a centimeter-ignited direct fuel
pump have suffered from fuel and source support from fossil energy sources, which produce
increasingly efficient and less polluting roles. With the help of technology in the automotive
market, fuel spray characterization by the injector is important to increase combustion
efficiency and leave abnormal combustion. However, characterizing spray and combustion is
not an easy task, both experimentally and numerically. This content, is found in Portuguese
the spray and the fuel of internal fuel injection in the fuel of internal fuel. Given the academic
and business interest in the open CFD cipher, OpenFOAM software is found in this work, my
source code is freely available for implementation. Spray dispersion models such as LISA,
TAB, Reitz-Diwakar and KHRT, which are already available in OpenFOAM, are used and
modified to make the dynamometer test experiment data converge and the results are
compared to the proposed new models. Important spray parameters, break angle, cone angle,
penetration, drop diameter, drop dispersion, velocity fields, among others, are calculated
according to the newly designed models. The characterization of combustion is generated by
new mathematical forms that can typify a laminar flame velocity, a demand and an average
combustion, as well as the parameters that characterize as turbulence fluctuations and
turbulence itself. The results show that in the characterization of the second spray break, the
graphs were analyzed and compared with the experimental and literature data. The elaborate
collision model was a modified form of O'Rourke's model, which is not only once, but the
collections are in the same cell, the new algorithm calculates the trajectory of all packets and
collides with those that intersect. in the same time frame. The laminar flame results show that
the combustion and pressure rates are not increased, which is a speed for doubling and an
important insulation temperature in half. The results further show that the mean and
temperature of the cylinder are influenced by differences in combustion temperatures.
However, the combustion temperature has little effect on Reynolds average progress. | |
