采用热-流耦合方法对火焰筒壁温三维数值模拟

Numerical Calculation of The Three-Dimensional Wall Temperature of The Combustion Chamber Using Heat-flow Coupling Method

考虑了流场变化对换热的影响,使用热-流耦合方法,对某型燃烧室整个流场、温度场进行完全的数值模拟。该方法对流场和固壁内换热进行耦合计算,得出了三维燃烧室壁温分布。计算中,对完全发展的湍流燃气采用了标准“k-ε”湍流模型,运用DO模型计算了燃气的热辐射,燃烧模型使用涡-耗散模型来计算化学反应速度,固壁材料使用了变比热和变导热系数。数值模拟结果表明流场与固壁相互作用得更充分,能更精确地反映流场和温度场的整个形态,可以模拟出较为合理的流场和温度场分布以及相应的流动换热特性。

To predict three-dimensional temperature distribution of a combustion chamber wall, heat -flow coupling method was present. Variable flow field effected heat transferring was adopted. In the calculation, the κ-ε double - equation model for turbulence, DO（ Discrete Ordinates）radiation model for heat radiation were taken into consideration, and Eddy-Dissipation model was utilized to assess chemical reaction speed, variable specific heat and variable coefficient of thermal conductivity were employed for solid. The investigation shows that fluid and solid interacted more sufficiently. So the flow field, temperature field and the characteristic of the flow and heat transfer were simulated more reasonable.