双级扩压器燃烧室两相燃烧流场的大涡模拟
首发时间:2009-12-29
摘要:在三维任意曲线坐标系下采用欧拉-拉格朗日两相大涡模拟方法对带两级突扩扩压器、火焰筒及内外环形冷却通道的环形燃烧室两相喷雾燃烧瞬态整体流场进行数值模拟。采用分区法和偏微分方程法生成环形燃烧室三维贴体网格;计算中采用k方程亚网格尺度模型估算亚网格紊流粘性;并用亚网格EBU燃烧模型与六通量热通量辐射模型对油雾燃烧进行大涡模拟。在非交错网格体系下气相采用SIMPLE算法和混合差分格式对控制方程进行求解,液相采用大涡模拟随机离散模型,在拉格朗日坐标系下追踪各油珠群沿各自轨道运动、质量损失及能量变化,采用PSIC算法考虑气液两相之间的耦合。采用多区域耦合法对各区域之间进行数据传递。计算结果与PIV测量的速度场以及出口温度和CO2浓度分布的实验数据进行比较,两者符合较好,表明在三维贴体坐标系下采用欧拉-拉格朗日两相大涡模拟模型计算环形燃烧室的两相喷雾燃烧流场,能反映两相紊流化学反应流流动及实际燃烧过程;两种不同几何参数的主燃孔对燃烧室流场影响比较大,但对出口参数的影响不太大。
关键词: 欧拉-拉格朗日两相大涡模拟 随机离散模型 多区域耦合法 环形燃烧室
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Large-Eddy Simulation of Two-Phase Combustion Flows in a Gas Turbine Combustor with Dump Diffuser
Abstract:An Eulerian-Lagrangian two phase large-eddy simulation (LES) method is developed for predicting three-dimensional instantaneous gas-liquid two phase turbulent reactive flows with arbitrary curvilinear coordinates in a gas turbine combustor with two-stage dump diffuser,flame tube and cooling passages. Zone method and elliptical grid generation procedure are used to generate three dimensional body-fitted grids of combustors. The sub-grid eddy viscosity of turbulence is simulated by using k-equation sub-grid scale model. The EBU combustion sub-grid scale model and six-flux radiation model are used to calculate Spray combustion flows. The gas phase governing equations are solved with SIMPLE algorithm and hybrid scheme in non-staggered grid system. A Stochastic Separated Flow formulation is employed to track the droplet trajectories, velocities, size and temperature history by Lagrangian equations of motion and thermal balance. The PSIC method is used to calculate the couple terms of gas phase and liquid phase. Multi-zone coupling method is used to timely transport data between interfaces. The influence of different primary hole parameters on reacting flows of combustor are simulated. Predictions are in reasonable agreement with the measured velocity profiles of PIV and experimental temperature pattern at the combustor outlet. It shows that an Eulerian-Lagrangian two phase LES method in an arbitrary curvilinear coordinates may be provide details of turbulent two-phase reacting flows for engineering applications. Different primary hole parameters of combustors have considerable influence on combustor reacting flows, but they have some influence on temperature and CO2 profiles at outlet.
Keywords: Eulerian-Lagrangian two phase large-eddy simulation(LES), Stochastic Separated Flow formulation(SSF) Multi-zone coupling method annual combustor
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