Development of a computer code for a solid fuel ramjet combustor.
详细信息
文摘
In the present thesis,the computer code DRAGON was developed for the prediction of the reacting flowfield in a solid fuel ramjet combustor. In the program,a one-step,irreversible chemical reaction between fuel and oxidizer (air) is considered. Two combustion models are selected to calculate the mixture composition using the diffusion flame model,which is based on infinitely fast reaction rate. In the first model,the diffusion flame model,the influence of turbulence on combustion is neglected,while in the second model,the turbulent diffusion flame model,this influence is included by weighting the mass fractions of the species involved in the chemical reaction by means of the beta Probability Density Function. In addition,solid fuel ignition and depletion events are ignored since a steady state is assumed. Radiation effects due to combustion are also neglected. The $\kappa - \epsilon$ turbulence closure model is used. The resulting nonlinear differential equations that describe the turbulent,reacting flow are solved by using a finite volume method. (Abstract shortened by UMI.)