| 摘要:采用三维非定常流动计算对某大功率六缸柴油机的脉冲排气系统进行了研究。计算物理模型采用Fluent多面体网格单元,排气管进口边界条件由发动机工作过程模拟软件GT-Power给定,湍流模型采用标准k－ε模型；结合对排气管开启、关闭时刻点以及排气最大流量点的分析,探讨了该脉冲排气系统的流动特性；并提出了优化方案。 |
| 关键词: 柴油机 脉冲排气系统 非定常流动 数值模拟 |
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| Research on Calculation of 3D Unsteady Flow for Pulse Exhaust System |
| Zhu Zhanfeng,Song Xigeng,Liu Yanzhao |
| School of Energy and Power Engineering,Dalian University of Technology, Liaoning Dalian 116024;Dalian Locomotive and Rolling Stock Co.Ltd., Liaoning Dalian 116024 |
| Abstract:Calculation of three-dimensional unsteady flow for the pulse exhaust system of a 6-cylinder diesel engine was carried out. For the actual exhaust manifold shape, the Fluent polyhedral mesh cells were used for calculating the physical model, the 1D GT-Power results for performance calculation were used as the boundary conditions of exhaust manifold, and the standard k－ε model was used as the turbulent model. The flow mechanism of pulse exhaust system was discussed by analyzing opening points, closing points and max mass flow points of exhaust manifold, and the optimization program was given. |
| Key words: diesel engine pulse exhaust system unsteady flow numerical simulation〖FL |
