Dynamic Analysis On Particle Characteristic In Gas-particle Thermal Flow Field

Gas-particle multiphase flow lies in nature and in fields of energy, chemical industry, petroleum, mining, architecture, water conservancy, light industry, metallurgy, environmental protection and so on. It can be found in the processes of coal dust transportation, crude oil recovery, sewage discharge, dust measurement, air conveying, astronautic and aeronautic propulsion, etc. In it often accompany heat transfer, mass transfer, chemical reaction and phase change. Mutual interactions of mass, momentum, energy and heat among different phases are very complicated. The problems of particle forces and motion characteristic by the action of heat, phase change, interaction between particles, particle collision, bounce, coagulation haven't been resolved thoroughly yetBased on scholar's research achievements at home and abroad, combined with theory analysis and numerical simulation, main job performed in the thesis is as follows:Firstly, force analysis of single particle in the flow field is performed. According to the maximum aerodynamic drag which can affect the particle motion, mathematical model is developed to compute drag of single spheric particle in laminar and turbulent flow. Then compute aerodynamic drag of high temperature particle at different temperature difference and fit the formula according to the computational data points.Secondly, basical equations and numerical method of gas phase and particle phase are developed and on which develop particle collision model and collision and sediment between particle and wall model to improve multiphase dynamic model further by taking interaction between both particles and particle and wall into account. Thirdly, replenish gasification phase change and heat reaction model of aluminum particle, atomization and phase change model of water droplets, radiation model for Aluminum/Water Fuel Motor. Simulate and validate ignition process of some experimental motor.Finally,3-D numerical simulation and multiphase thermal dynamic analysis are performed for some concept motor. Motion, evaporation, phase change, etc of water droplets and aluminum particle in the flow field is described. The influence of water jet pattern and angle, aluminum particle content, water scale in main chamber and afterburning chamber to multiphase adulterated effect and motor performance is analized. How to get the optimum parameters value to improve multiphase adulterated effect to a maximum degree is discussed and determined.A lot of exploratory research and dynamic analysis for particle characteristic and behavior in gas-particle multiphase flow is performed in this thesis. Improve the corresponding fundamental theory further. At the same time, study on complicated multiphase flow field of typical Aluminum/Water Fuel Motor can guide the relative engineering design and optimization.