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中文摘要：
针对对置活塞对置气缸（OPOC）柴油机混合气形成较为困难的工作特点，有必要合理组织缸内流动，利用CFD软件研究了这种发动机不同进气方式形成涡流和滚流的效果。着重优化了滚流的形成方式，比较了涡流、滚流情况下缸内流动的特点，并对各自的喷油参数进行了优化，以适应不同的缸内流动形式，最后研究了两种流动方式对燃烧的影响。结果表明，缸内流动形式对燃烧的影响有很大差异。其中，组织滚流能大大提高上止点附近的缸内湍流动能，同时通过优化喷孔布置还可以增大空气利用率，由此加快了燃烧进程，并避免了火焰偏离燃烧室中心的现象，减小了向缸壁的传热损失，从而提高了OPOC柴油机的性能。
英文摘要：
Organizing reasonable in-cylinder flow is helpful to the mixture formation in the opposed piston opposed cylinder （OPOC） diesel engine. Focusing on this issue, the performances of swirl flow and tum- ble with different intake-ports were studied with CFD software. The characteristics of the two flows were compared and their injection parameters were optimized to match the different in-cylinder flows. Effect of flow on combustion was also studied. The results show that different in-cylinder flow has great influence on combustion. The tumble flow can greatly increase turbulent kinetic energy around TDC, increase air utili- zation ratio by optimizing the nozzle, accelerate combustion progress, prevent combustion deviating from the center of combustion chamber, decrease heat conduction to the wall and boost performance of OPOC.
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