Numerical Simulation Of Three-Dimensional Turbulence In A Micro-Gas Turbine Combustor

Gas turbine is a high-power and high-efficiency power generating machine developed from advanced science and technology, which is widely used for generating mechanical power in electric power stations, aviation, navigation, petrochemical engineering and natural gas transport. There, combustor is a key component which is more complex than other components. In studying the working principles of the gas turbine combustor, theories in gas dynamics, heat transfer, mass transfer and chemical reactions have to be applied. With the rapid development of computational fluid dynamics, computational combustion theory, computer hardware and software, numerical simulation has become more and more important. Applying numerical simulation is significant to develop and apply gas turbine, which can improve its reliability, reduce the cost and protect the environment.This thesis takes a complex cylindrical combustor about Allied Signal 75kw gas turbine as the object of study, and solid modeling is established with CATIA V5 software. Combustor axial and radial cyclone modeling is the emphasis of this thesis; cyclone modeling has a direct impact on the success or failure of the grid quality and the accuracy of numerical simulation.Three-dimensional turbulence nonreacting and reacting flow in gas turbine combustor is studied numerically using the FLUENT software. Mathematical models of the combustor are developed by:a) Applying the RANS numerical simulation method.b) Applying the RNG k-εturbulence model to calculate the turbulence.c) Applying the SIMPLEC method to solve the set of discretized equations.d) Applying the EBU-Arrhenius model to simulate the combustion.e) Applying the HDS to solve basic equations.It is found that the predicted results from this thesis about nonreacting flow and reacting flow are right qualitatively. In the centre of the front of combustor, a centre reflow zone and an angle reflow zone appeare. Heat flow field and cold flow field have a certain similarity, the length of heat flow field at centre reflow zone is less than cold flow field, and the axial velocity of thermal conditions is greater than cold conditions. The several useful conclusions obtained from this thesis will be beneficial to further research on supplemental firing and design optimization.