| Based on a type TBD234V12 pulse Turbo-charging and sequential turbo-charging (STC) diesel engine with 2 turbochargers, a calculating model is set up in this thesis. Its intake and exhaust system are modeled by one-dimensional unsteady flow, whose partial differential equations are discredited by FVM. Three-Wiebe curve has been used to simulate the heat release regulation in the zero-dimensional cylinder model. A calculation to the general turbo-charging has been performed, and the calculated result tend to be in agreement with the experimental ones, and indicated that, after employing STC model, the type diesel engine had the distinct improvement in its low load.The exhaust system has great influence on the performance, and it is necessary to research the system fully and deeply. In the investigation, the method of three-dimensional numerical simulation, andκ-εturbulence model, and SIMPLE algorithm are used in the model. For the purpose of studying the three dimensional steady flow dynamic characteristic in exhaust system of general turbo-charging and STC, the core is CFD simulation and take FLUENT as the model which the software working platform establishes .This article computed result clear has indicated that the structural line of exhaust pipeline has influence on flow field, and provided the evidence for the piping system design, the improvement and the optimization, and the result has obtained with the correlation literature close effect, and has overcome foundation for the next further research. |
