| 摘要:采用三维计算流体力学方法(CFD)对某型低速船用柴油机的贯入式排气管系统开展性能预测及流动损失机理研究。研究结果表明:支管相对贯入深度及其末端扩张角对管路系统压力损失系数有显著影响，损失随贯入深度增加逐渐降低，但存在损失最小的最佳扩张角；流场分析显示，支管内气流与总管壁面相互作用形成的涡结构是支管几何结构影响流动损失的主要原因。 |
| 关键词: 船用低速柴油机 贯入式排气管 CFD 流动损失 |
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| Performance and Loss Mechanism Analysis of Plug-inExhaust Pipe for Low Speed Marine Diesel Engine |
| Duan Shaoyuan,Deng Kangyao,Yang Mingyang,Wang Zhen,Qian Yuehua |
| Key Laboratory for Power Machinery ＆ Engineering of Ministry of Education , Shanghai Jiaotong University,Shanghai 200240;China Shipbuilding Power Engineering Institute Co., Ltd., Shanghai 201206 |
| Abstract:The performance prediction and flow loss mechanism of a low-speed marine diesel engine's plug-in exhaust pipe were studied by using the three-dimensional computational fluid mechanics method (CFD).The results show that the relative penetration depth and the expansion angle of the branch have significant influence on the pressure loss coefficient of pipeline system. The loss decreases with the increase of penetration depth, but there is the optimal angle of expansion with minimum loss. The flow field analysis shows that the vortex structure formed by the interaction between the internal air flow and the wall surface of the main pipe is the main reason for the flow loss caused by the manifold geometry. |
| Key words: low-speed marine diesel engine plug-in exhaust pipe CFD flow loss |
