| Fluent, a CFD program, was developed by U.S FLUENT Company in 1983.CFD is short for Computational Fluid Dynamics, it is the science of predicting fluid flow, heat and mass transfer, chemical reactions, and related phenomena by solving numerically the set of governing mathematical equations. It can be used in the flow analysis of the 2D Space, 2D Axisymmetric and 3D flow analysis. It can accomplish field simulation at kinds of references, steady and unsteady analysis, incompressible and compressible calculation, laminar and turbulence simulation, heat transfer and heat mixer analysis, chemical species mixer and reaction analysis, multiphase flows analysis, solid and liquid coupling heat transfer analysis, porous media analysis.Based on the fuel spray and mix, turbulent flow, combustion calculation theory, NO_x formation model, initial and boundary conditions and mesh creation, a three dimension combustion model has been established. Mesh creation of the geometry model has been carried out with hexahedral and cuneiform cell. The mesh regions swept out by the moving surfaces has been represented by dynamic layering zones. In the fuel spray and mix model, discrete phase liquid droplets model has been used to simulate the movement of fuel liquid droplets. Multi-injection solid cone injector source and Rosin-Rammler distribution have been used to distribute fuel injection. The breakup of pilot fuel liquid droplets has been simulated by Wave Breakup model. Ignition delay has been calculated by the formula deduced by Hardenburg and Hase. Turbulent flow has been simulated by Renormalization Group Theory (RNG) k-εformula.Based on FLUENT, the operation process in cylinder of a ZS195diesel engine modified is simulated, the detail information of the flow field in cylinder and average performance graphic charts are obtained and compared with the experimental data. The simulation of the three dimension combustion model consistent with the experimental resulted well.
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