模型燃烧室内瞬态紊流的大涡模拟

本文采用三种不同亚网格尺度模型对带有V型稳定器的模型燃烧室二维瞬态紊流流动进行了大涡模拟。并在交错网格系下用SIMPLE算法和混合差分格式求解离散方程。数值研究拟不同型式入口速度分布和不同亚网格尺度模型下模型燃烧室二维瞬态紊流流场。计算结果表明不同入口速度分布和不同亚网格尺度模型对瞬态流场和出口速度分布有一定的影响。本文通过数值模拟,揭示了V型稳定器后旋涡的产生和脱落过程。通过计算结果及实验数据的比较可知,本文采用的亚网格尺度模型可以用来模拟模型燃烧室紊流流场及稳定器后面回流区的流动情况。

Large Eddy Simulation of Transient Turbulent Flows in Model Combustor

The transient turbulent flows were predicted by large eddy simulation in a model combustor with a V gutter flame holder. Different subgrid scale model,SIMPLE algorithm and hybrid scheme were used with the staggered grid system. Predictions show that different inlet velocity profiles and subgrid scale models have effects on transient turbulent flow structures and outlet velocity profiles. Large eddy simulation method may used to investigate the process of vortex producing, shedding and vanishing alter- natively behind the bluff body stabilizer. By the comparison of simulation results and experiment data, the subgrid scale models can simulate the transient turbulent flow and recirculation zone behind the bluff body stabilizer.