AN EDDY CHARACTERISTIC TIME MODELING IN LES FOR GAS TURBINE COMBUSTOR

摘要

For calculating turbulent flame characteristics such as temperature and chemical species in the gas turbine combustor, an effort applying Large Eddy Simulation (LES) to a combustion simulation has been made in recent years. However, there is no established method of estimating reaction rate on LES combustion simulation. In this paper, we construct an eddy characteristic time derived from large-scale motion to calculate the combustion reaction rate using an eddy dissipation concept model (EDC) and estimate combustion characteristics (temperature and chemical species distribution) in the combustor for the purpose of solving fundamental problems of gas turbine combustor such as swirling effect or formation of pollutant products. As a result, it is shown that the combustion simulation using LES with EDC model is effective method to calculate the characteristics of turbulent diffusion flame such as gas turbine combustor.