环形燃烧室两相燃烧数值研究

根据环形燃烧室设计需要,运用计算机模拟技术研究模型环形燃烧室三维有旋液雾燃烧流场,研究两相流动与混合,液雾蒸发对燃烧过程的影响。两相流动模型采用颗粒群轨道模型,气相紊流输运方程求解采用双方程k-ε模型和EBU-Arrhenius紊流燃烧模型,热辐射采用热通量法模型,本文提供计算方法可以用来研究不同性能参数对环形燃烧室两相燃烧特性影响。

A COMPUTATIONAL PROCEDURE OF THREE-DIMENSIONAL TWO-PHASE COMBUSTION IN AN ANNULAR COMBUSTOR

For optimum design of an annular combustor, a mathematical model of the three-dimensional two-phase reacting flow is presented, which takes into account the effect of liquid fuel vapour and the mixing between two phase flows on combustion. The gas phase conservation equations of momentum, enthalpy and mixture fraction are solved with the k-s turbulence model and EBU -Arrhenius combustion model. Radiative heat transfer is handled by heat flux method. In order to model complex interactions between the gas-droplet flow, the PSI-CELL model is applied based on the concept that droplets are treated as sources of mass, momentum and energy to the gaseous phase. The Lagrangian approach is used to predict droplet trajectories, size and temperature history. The gas phase is calculated by solving finite-difference equations in the Eulerian frame of reference. The FDE'S are solved by the SIMPLE algorithm and CTDMA formulation. The results, including velocity profles, fuel fraction and temperature distributions, show that this analytical technique is useful for the optimum design of combustion chambers.