大涡模拟在加力燃烧室冷态流场中的应用

对带V型稳定器模型加力燃烧室二维冷态流动进行了大涡模拟。采用了代数和k方程两种亚网格尺度模型，并用SIMPLE算法和混合差分格式求解离散方程，用壁面函数处理固壁边界条件，得到了模型加力燃烧室二维瞬态流场的模拟结果。通过对不同亚网格尺度模型和不同入口速度下的瞬态流场的比较，揭示了不同亚网格尺度模型和不同入口速度分布对带V型稳定器燃烧室二维冷态瞬态流场的影响。

Large-Eddy Simulation of Turbulent Flow in an Afterburner

Large-eddy simulation(LES) is developed to study the effect of different inlet velocity profiles on instantaneous turbulent flows in the model afterburner with a V-gutter flame holder. Algebraic subgrid-scale (ASGS) and k-equation subgrid-scale (KSGS) models are used for large-eddy simulations. SIMPLE algorithm and hybrid scheme are used in the staggered grid system. Wall function is applied to treating near wall region. Computations are conducted on different subgrid-scale models. Predictions reveal that the KSGS model can predict the instantaneous turbulent flow structure and the turbulence development history more reasonable than the ASGS model. The local details of turbulent flow structure vary with different velocity profiles. Calculations about the sine inlet velocity profile are more accurate than the other inlet velocity profiles. Further study is underway to investigate the rationality of the KSGS model by applying it to reacting turbulent flows.