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首页> 外文会议>SAE International Powertrains, Fuels Lubricants Meeting >Numerical Simulation of Intake Port and In-Cylinder Flow in a Two-Valve Multi-Cylinder Diesel Engine
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Numerical Simulation of Intake Port and In-Cylinder Flow in a Two-Valve Multi-Cylinder Diesel Engine

机译：双阀多缸柴油发动机中进气口和缸内流动的数值模拟

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摘要

In small and compact class vehicles equipped with diesel engines, the 2-valve-per-cylinder design still holds a significant share of the market. The current work describes the numerical simulation of port-valve-cylinder flow in a 1.2 liter 2-valve-per-cylinder diesel engine to characterize the performance of its manifold and intake ports. First, evaluation metrics were defined and analysis procedure was established for CFD assessment of intake manifold performance in multi-cylinder engines. Then the CFD analysis was carried out for the 2-valve engine in comparison with the baseline 4-valve reference engine. The results show that a complex interaction between intake port and flow distribution around TDC was found in the 2-valve engine, resulting in much higher mean flow velocity, inhomogeneity index/rotational momentum at the port inlet and consequently higher swirl ratio than the baseline 4-valve engine, which can cause high smoke at high load operations. As the recovery plan, CFD simulations show that the high capacity manifold with bigger plenum volume and longer runners helps improve flow homogeneity and cylinder-to-cylinder flow variations in the 2-valve engine. The benefits in improving engine torque and emissions have been verified by multi-cylinder engine testing.
机译：在配备柴油发动机的小型和紧凑型车辆中，双阀门的每缸设计仍然具有大量的市场份额。目前的工作描述了1.2升2阀 - 阀芯柴油发动机中的端口阀缸流量的数值模拟，以表征其歧管和进气口的性能。首先，定义了评估度量，并确定了用于多缸发动机的进气歧管性能的CFD评估的分析程序。然后与基线4阀参考发动机相比，为2阀发动机进行了CFD分析。结果表明，在2阀发动机中发现了TDC周围进气口和流动分布之间的复杂相互作用，导致端口入口处的平均流速，不均匀性指数/旋转动量更高，因此比基线4更高的旋涡比-Valve发动机，可以在高负荷操作中引起高烟。作为恢复计划，CFD模拟表明，具有更大的压力体积和更长的跑步者的高容量歧管有助于提高2阀发动机中的流动均匀性和气缸到缸流动变化。通过多汽缸发动机测试验证了改善发动机扭矩和排放的益处。

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