| 摘要:在某船用低速柴油机燃烧系统开发中，为设置合理的喷孔方向，应用流体动力学软件STAR-CD对不同喷孔方向的缸内燃烧情况进行仿真分析。分析结果表明:喷孔方向对柴油机缸内燃烧的影响较大；喷孔方向顺着缸内涡流方向时可促进喷射燃油的传播及混合，改善缸内燃烧；但喷孔方向顺着涡流朝向缸套壁面喷射时，油气混合主要发生在燃烧室缸套壁面附近，增大了缸套壁面的传热，且不利于燃烧室中心区域空气的利用；本文研究中，原喷油器的喷孔绕喷油器轴线朝缸内涡流方向旋转30°或35°时，缸内燃烧情况明显改善。 |
| 关键词: 船用低速柴油机 喷孔 缸内燃烧 仿真 |
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| Simulation Research on the Effect of the Injector Nozzle Hole Direction on the In-Cylinder Combustion of Marine Low Speed Diesel Engines |
| Liu Chenpeng,Gui Yong,Liu Teng,Wen Liming |
| China Shipbuilding Power Engineering Institute Co., Ltd., Shanghai 200129 |
| Abstract:In the development of the combustion system of a certain type of marine low speed diesel engine, to get an appropriate injector nozzle hole direction, in-cylinder combustion with different injector nozzle hole directions was simulated with STAR-CD software. The analysis result shows that the injector nozzle hole directions have big effect on the in-cylinder combustion of diesel engines, they will prompt the propagation of the injected fuel and the mixing process and improve the combustion quality while the injector direction is the same with the swirl direction; but the fuel and gas mixing mainly occurred near the cylinder liner wall, if the injector nozzle hole direction is along with the swirl direction, toward the cylinder liner wall, which would increase the heat transfer of liner wall and the air in the center chamber would not be utilized. When the original injector nozzle hole direction was turned 30°or 35°along injector′s axis to the swirl direction in the cylinder, the combustion quality in the cylinder could be improved significantly. |
| Key words: marine low-speed diesel engine injector nozzle hole in-cylinder combustion simulation |
