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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >ANALYSIS OF CRANK ANGLE-RESOLVED VORTEX CHARACTERISTICS UNDER HIGH SWIRL CONDITION IN A SPARK-IGNITION DIRECT-INJECTION ENGINE
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ANALYSIS OF CRANK ANGLE-RESOLVED VORTEX CHARACTERISTICS UNDER HIGH SWIRL CONDITION IN A SPARK-IGNITION DIRECT-INJECTION ENGINE

机译：喷火直喷发动机高旋流条件下的弯角涡旋涡特性分析

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摘要

In-cylinder air flow structure makes significant impacts on fuel spray dispersion, fuel mixture formation, and flame propagation in spark ignition direct injection (SIDI) engines. While flow vortices can be observed during the early stage of intake stroke, it is very difficult to clearly identify their transient characteristics because these vortices are of multiple length scales with very different swirl motion strength. In this study, a high-speed time-resolved 2D particle image velocimetry (PIV) is applied to record the flow structure of in-cylinder flow field along a swirl plane at 30 mm below the injector tip. First, a discretized method using flow field velocity vectors is presented to identify the location, strength, and rotating direction of vortices at different crank angles. The transients of vortex formation and dissipation processes are revealed by tracing the location and motion of the vortex center during the intake and compression strokes. In addition, an analysis method known as the wind-rose diagram, which is implemented for meteorological application, has been adopted to show the velocity direction distributions of 100 consecutive cycles. Results show that there exists more than one vortex center during early intake stroke and their fluctuations between each cycle can be clearly visualized. In summary, this approach provides an effective way to identify the vortex structure and to track the motion of vortex center for both large-scale and small-scale vortices.
机译：缸内气流结构对火花点火直喷（SIDI）发动机的燃料喷雾分散，燃料混合物形成和火焰繁殖产生显着影响。虽然在进气冲程的早期阶段可以观察到流动涡流，但很难明确识别其瞬态特性，因为这些涡流具有具有非常不同的旋流运动强度的多长度尺度。在该研究中，施加高速时间分辨的2D粒子图像速度（PIV）以沿着喷射器尖端下方30mm的旋流平面记录缸内流场的流动结构。首先，呈现使用流场速度向量的离散方法以识别不同曲柄角处的涡流的位置，强度和旋转方向。通过追踪摄入和压缩冲程期间涡流中心的位置和运动来揭示涡旋形成和耗散过程的瞬变。另外，已采用称为气象应用的风玫瑰图所示的分析方法，已经采用了100个连续循环的速度方向分布。结果表明，早期进气冲程期间存在多于一个以上的涡流中心，并且每个循环之间的波动可以清晰可视化。总之，这种方法提供了识别涡流结构的有效方法，并跟踪大规模和小型涡流的涡旋中心的运动。

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