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The article researches the performance of the diesel engine adopting variable composition air using numerical simulation and experimental methods. The mechanism of NO formation has been validated. At the same time the experiment and numerical simulation show that it is useful to lessen the diesel NO emission owing to adopting NEA (nitrogen-enriched air) technology and nitrogen concentration need not...
Based on KIVA-3V code, the numerical simulation on the combustion process and NOx emission of a light-vehicle diesel engine is carried out, using different injection strategies. The results show that compared with the traditional single injection, pilot injection can decline the ignition delay period and the maximum combustion temperature, which leads to the reduction of the NOX emission, as pre-injection...
A concept of forced swirl combustion chamber in diesel engine is proposed in this paper. It can be used to enhance the intensity of swirl flow in the cylinder and accelerate the rate of air-fuel mixture process by designing the special structure in the combustion chamber. This new type of forced swirl combustion chamber includes double swirl combustion chamber that was discussed past and partial swirl...
The middle speed four stroke diesel engine has the advantages of small capacity, light in weight, capable to combustion poor fuel oil. In recent years, they have been used more comprehensive than before. Daihatsu 6PSHdM-26H diesel engine, which is a type of 4-stroke medium-speed turbocharged marine diesel engine, is widely used in ocean-going ships. Describes the failure or fuel injection system with...
The numerical simulation was carried out by building methane-diesel fuel model at the base of physical model and basic control equation of hydrodynamics, by adopting non-premix combustion method, by simplifying combustion as blends, and by calculating blend fraction. Furthermore, its combustion press field, temperature field and velocity field were analysed. Finally, the experimental results indicated...
A numerical simulation model for the sequential turbo charging (STC) diesel engine was established by STAR-CD and the initial boundary condition of the model was calculated by the GT-POWER. The experiment results were compared to multi-dimensional model results. Based on the model, the effects on the combustion process and the NOx emissions, including inject cone angle and inject timing were studied...
Dimethyl ether (DME) can be used as a clean high-efficiency compression ignition fuel with reduced NOx, SOx, COx and particulate matter. The subject of this work is to investigate of the injection characteristics of diesel and DME within the same specifications of injection system. The mathematical model is established for the conventional pump-pipe-nozzle fuel injection system and numerical simulation...
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