Numerical Simulation Of Combustion Flow Field In Flue Gas Generator

In this article, the object of study is a flue gas generator on a turbine test-bed. This flue gas generator's purpose is providing rated temperature and flux flue gas to the turbine, ensuring the turbine test-bed regular work. This paper adopted a numerical simulation method to analyze the fluid structure of a combustion chamber in the flue gas generator. Numerical results were analyzed in the combustion chamber and the main problems of the flow field were discussed. Special measures were taken to improve the flow structure inside the combustion chamber and obtained the optimum structure. Using numerical simulation can estimate the parameters, which are not easy to measure and not doing so many experiments, can improve its reliability and reduce the cost.Constituting some equations which reflect the flow law and building and applying many mathematical models of physical and chemical reactions in the flue gas generator: applying RNG k-εtwo equations turbulence model to calculate the turbulence parameters; applying simplied reaction system model and applying particle cloud tracking model. With these reasonable simplied models, numerically simulating the flow field in the flue gas generator. During the numerical simulation, using the first order upwind format to disperse the equations; applying SIMPLEC algorithm method to solve the equations.Using above models and methods, we obtain flow field distribution of turbulent flow parameters; including temperature, pressure, velocity, density and mixture fraction of products. Numerical results were analyzed in the combustion chamber and the main problems of the flow field were discussed. Special measures were taken to improve the flow structure inside the combustion chamber. Numerical experiments show that those measures are very effective and the modified design is much better than the original design. These results are significant to design and improve the flue gas generator.