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In order to make full use of the air in the chamber, improve the mixing process, reduce raw emission and fuel consumption of diesel engine, a novel combustion system, the Side Swirl Combustion System (SSCS), was proposed in the present paper. The effects of the distance between the flange and the nozzle (DBFN), a crucial parameter to the designing of SSCS, on the performance of the diesel with SSCS...
The combustion process and emission characteristics in diesel engine mainly depend on the mixture formation in cylinder. Spray characteristic is an important factor which affects the mixture formation and combustion process. Further, nozzle hole cone angle of the fuel injector directly influence the spray characteristic. In this paper, flow evolution process, spray distribution, fuel/air ratio equivalence...
Diesel engine works under mix combustion (constant volume and constant pressure) with low combustion rate and speed, resulting in its thermal efficiency is lower than the constant volume combustion type at the same compression rate. A diesel engine model with new type of crankshaft connecting rod mechanism which can stay in the TDC for a long time is developed to realize constant volume combustion...
A numerical simulation model based on the KIVA code was carried out for a DI diesel engine in-cylinder process. Two candidate chambers were compared with the original chamber to study their effects on combustion and emission characteristics. The results show that low emission was achieved in the chamber C with maximal bowl diameter and bowl depth. Compared with the original chamber, Soot and NOx of...
Combustion chamber geometry is very important for the performance of diesel engine, especially for the nonroad diesel engine with low fuel injection pressure. To decrease the experimental work, the CAE technique, such as computational fluid dynamics (CFD), was used to design the combustion chamber of a nonroad diesel engine. In order to investigate the effects of combustion chamber geometry on mixture...
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...
Marine diesel-generator speed-frequency control system based on sliding mode control (SMC) scheme is introduced in this paper, which is capable of providing good and consistent speed-frequency control performance, despite wide variations in the system operating conditions. The SMC scheme consists of a conventional governor based on a standard speed error signal, and an auxiliary loop incorporating...
To simulate the combustion species for direct-injection diesel engines, the new flame let model is presented and used. The model is based on stoichiometric mixture fraction space, and a way of separating the numerical effort associated with the solution of the turbulent flow field from that of solving the chemistry is offered. The new species equations are carried out through coordinates' transformation...
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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