哈尔滨工程大学学报2026，Vol.47Issue(8)：1690-1696,7.DOI:10.11990/jheu.202501028
汇合弯头形状对船用柴油机排气管阻力的影响
Study on effect of junction geometry on resistance of marine diesel engine exhaust pipe
摘要
Abstract
Flow structure inside the marine diesel engine exhaust pipe is improved and exhaust resistance is re-duced via shape optimization of the exhaust junction for a dual-turbocharger diesel engine.Three-dimensional nu-merical simulations based on computational fluid dynamics(CFD)are performed on the original and optimized ex-haust pipes to compare flow structure and flow resistance in each pipe section,and to reveal the mechanism of flow resistance and the cause of resistance reduction.The results of simulation show that the optimization of the exhaust junction geometry weakens the jet impingement from branch pipes to the main pipe,optimizes the flow velocity dis-tribution,eliminates swirling secondary flow,and reduces turbulence intensity and turbulent kinetic energy produc-tion rate,leading to a maximum reduction of 32.5％in total pressure loss of the exhaust pipe.Geometry modifica-tion of upstream exhaust components exerts considerable influence on frictional and local total pressure loss in downstream sections,indicating that further investigations should be carried out for integrated exhaust systems.关键词
柴油机/排气系统/减阻/二次流动/湍流/数值仿真/计算流体力学/优化/船舶Key words
diesel engines/exhaust systems/drag reduction/secondary flow/turbulence/numerical simulation/computational fluid dynamics/optimization/ship分类
交通工程引用本文复制引用
谢胤,吴中正,杨卫英,饶宇..汇合弯头形状对船用柴油机排气管阻力的影响[J].哈尔滨工程大学学报,2026,47(8):1690-1696,7.基金项目
国家自然科学基金项目(11972230). （11972230）
