Study On Applicability Of Turbulent Combustion Model In The Numerical Calculation Of Combustor

During the congnization and study of combustion and flow in the aeroengine combustor, numerical simulation plays an important role in the development of the basic theory and advanced technology. We can believe that with the development of computer performance and calculating technology, the veracity and applicability of combustor numerical simulation will be improved. And numerical simulation will become the primary tool that is used to estimate the combustor performance and its design.At the same time,due to complexity of the issue about turbulence combustion in the aeroengine combustor,turbulent combustion model as a basic tool for simulation of combustion,from modeling to verify and the application of engineering,has received extensive attention.At the first ,the reasonable solution domain of the problem is delimited and simplified, establish geometry model and the grid. In the entire combustor simulation,Realizable k-εtwo-equation turbulence model is selected to simulate internal flow of the combustion chamber; discrete phase model and Pressure-swirl Atomizer model are used to calculate the spray; 5 typical combustion model in the commercial CFD software FLUENT which contain finite-Rate/Eddy-Dissipation model(fED),Eddy-Dissipation model (EDM) and the Eddy-Dissipation concept model (EDC) based on the Species Transport model, as well as Equilibrium(PDF) and steady Flamelet model (FLM) based on Non-Premixed Combustion model, is separately chosed to simulate turbulent diffusion Flames; P-1 radiation model is selected to estimate the radiation fluxes of radiation; materiel parameters is seted on a function of temperature; The governing equations are solved on a high performance computer cluster (HPCC) with parallel processing and high order descretization scheme.Velocity field and pressure field of gas flow in the combustion chamber, atomized particle tracks of the fuel,temperature field and species concentration field of the combustion are obtained by calculation. The results showed that gas flow velocity field and pressure field , particle tracks of the fuel change less and temperature field and species concentration field of the combustion change more based on different turbulent combustion model, The highest temperature accounted by fED model, EDM model and EDC model in the main combustion region is significantly higher than PDF model and FLM model.At the same time,exit average temperature and inequality coefficient computed by different combustion model are compared with test data,the results show that the value calculated by EDM model is the most approach to test data. In addition,this paper validates the engineering applicability of the combustor numerical simulation based on different turbulent combustion model and also points out the problem of the combustor model that needs to be improved, the conclusion is meaningful for combustor design and research.