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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >High Resolution Scalar and Velocity Measurements in an IC Engine
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High Resolution Scalar and Velocity Measurements in an IC Engine

机译：IC引擎中的高分辨率标量和速度测量

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摘要

High resolution planar laser-induced fluorescence (PLIF) and particle-image velocimetry (PIV) measurements were acquired during the intake stroke in a motored engine to investigate the mixing behavior of in-cylinder flows. The data were analyzed to determine the scalar energy and kinetic energy spectra, which were used to find the corresponding dissipation spectra. The results were compared to a model turbulent spectrum. The scalar energy and scalar dissipation spectra were shown to be resolved through the full dissipation range, enabling the determination of the Batchelor / Kolmogorov length scale, and agreed well with the model turbulent spectrum at all but the highest wavenumbers where the effects of random noise were present. The 2% point in the scalar dissipation spectra was used to estimate the Batchelor scale, which was found to be approximately 32 μm. The PIV data, which had a 675 μm interrogation region, were used to calculate a one-dimensional kinetic energy spectrum. The kinetic energy spectrum agreed well with the scalar energy spectrum and the model spectrum up to wavenumbers corresponding to approximately 2× the PIV interrogation region size. For the present measurements, this meant that the PIV data were not able to resolve the peak in the dissipation spectrum, i.e. the full high-wavenumber part of the inertial subrange.
机译：在机动发动机的进气冲程期间，获得了高分辨率平面激光诱导荧光（PLIF）和颗粒图像测速（PIV）测量，以研究缸内流的混合行为。分析数据以确定标量能谱和动能谱，这些谱用于查找相应的耗散谱。将结果与模型湍流谱进行比较。结果表明，标量能量和标量耗散谱可以在整个耗散范围内分解，从而可以确定Batchelor / Kolmogorov长度标度，并且与模型湍流谱非常吻合，除了最高波数（随机噪声影响最大）当下。标量耗散光谱中的2％点用于估计Batchelor规模，发现其约为32μm。具有675μm询问区域的PIV数据用于计算一维动能谱。动能谱与标量能谱和模型谱非常吻合，直到波数对应于大约2倍PIV询问区域大小。对于当前的测量，这意味着PIV数据无法解析耗散谱中的峰值，即惯性子范围的完整高波数部分。

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