Research On Numerical Simulation Of Soot Formation In A 2-D Simplified Gas Turbine Combustor

Soot particles are inevitable outcome during the hydrocarbon fuel combustion, which are the coagulation of PAHs. They are air pollutants that are harm to human body and can make a series of atmospheric environment effects. In gas turbine combustors, soot particles' formation and radiation can affect the accuracy of numerical simulation, especially for the gas and wall temperature.In order to investigate soot particles' distribution in gas turbine combustors, this paper presents detailed mechanisms and detailed model of soot formation and oxidation. The major components' concentration is gotten through numerical simulation of combustion flow with C7H16 detailed chemical kinetic mechanisms, and then they are used to feed the method of moments to get the soot particles' distribution. Under the two-dimensional body-fitted grid, the turbulent characteristics are estimated by k ?εequations, and the reacting ratio is estimated by Eddy dissipation concept model. The four flux model is applied to predict the heat flux distributions, so as to consider the influence of heat radiation on the gas temperature and wall temperature. The reacting model is PSR, which is used in every node. The method of moments is used to deal with soot particles size distribution. The mechanism compiler and API functions of CHEMKIN can separately generate the connecting document and treat complex chemical reaction items during the Fortran program running. Control volume method is used to discretize the governing equations on a non-staggered grid system, and the discrete equations are sloved with SIMPLE algorithm. The method of wall functions in the arbitrary curve coordinate is applied to treat the prediction of flow in the near wall region.The paper considers four different kinds of excess coefficient and three vertical section of gas turbine combustor. The analogy between the result and the other one in turbulent jet diffusion flame of methane and air have been taken, and validates the feasibility and correction of this method and procedure.