Visualization Modeling Of The Burning Of Engine And Its Realization Of The WD615 Engine Digital Prototype

Lately, the technology of virtual prototype has become a main method to develop products. It is a digitalized model based on computer simulation model. This paper has studied a series of burning physical processes and used mathematical models to simulate the scenes, from fuel injection to fog effect in engine scenario, leveraging the relevant researches of irregular objects realistic image in the field of computer graphics. Besides, particle system and cellular automaton are effective methods to describe irregular objects and both of them are implemented in the simulation models to realize irregular objects visualized effects in WD516 engine scenario.The chapter 1 summarizes the development trend of the virtual prototype technology, pointing out the significance of constructing a visualize model in virtual prototype scenario. It compares the computer graphic method to describe irregular objects the mathematical model based on rules of object movement and stochastic effect based on pre-calculation. A mathematical model of irregular objects for particle system and cellular automaton is given as an example. At the end of this chapter, the research direction and structure of the whole paper is laid out.The chapter 2 mainly describes the physics characteristics of fuel injection in the engine scenario. Particle system, oil fog physical movement model, the corresponding particle characteristics and rules of movement and the index for fuel injection equipment are used to define the fuel injecting cycle and volume. A method of texture mapping, which is broadly used in advertisement board technology, is also introduced here.The chapter 3 focuses on the fog effect of evaporation of fuel particles and mixture with air before ignition. The interaction rules between liquid fuel steam and its particle "neighbors" are constructed by studying the relation between the stochastical perturbation effect and foggy effect. According to the cellular automaton and its corresponding space and interactions among particles, the diffusion of foggy process has been controlled. Lastly, it is described that how to use metaball to visualize continuous distribution of particle density.The chapter 4 concentrates on the research on burning model in engine gas cylinder, including the transmission of flames and the categorization of burning models. Due to the truth that the number of particles stays the same within cylinder while the volume is changing all the time, it is necessary to re-divide space for cellular and take into consideration the change of condition from mother cells to new cells. That's the underlying rationale of a volume-changing cellular automaton. Finally, I visualize the burning effect via flame transmission model and cellular automaton generating rules. The chapter 5 integrate the relative data module and visual effect into the vitual prototype environment of WD615. The fuel injection effect, fog effect and burning effect is realized via OpenGL functions. And they're embeded into the vitual prototype environment to provide a visualization research module of the scenario.At last, the chapter 6 makes a summary of the whole thesis, and looks forward to the future development of the corresponding technique.