High-speed tomographic PIV measurements in a DISI engine
High-speed tomographic PIV measurements in a DISI engine
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DOI：
10.1007/s00348-019-2792-4
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发表时间：
2019-08
影响因子：
2.4
通讯作者：
M. Braun;W. Schröder;M. Klaas
中科院分区：
文献类型：
--
作者：
M. Braun;W. Schröder;M. Klaas
发动机过程需要特定燃料-空气混合物的基础知识，以减少污染物排放，即碳烟的形成和生成，并提高发动机效率。然而，内燃机缸内流场具有随时间变化、高度三维的大尺度流动结构和循环变化(CCV)的特点。这意味着需要高速体积速度测量来研究燃烧室内高时间分辨率的三维大尺度流动结构和CCV。由于文献中很难获得这样的数据，因此使用高速层析粒子图像测速仪(HS-TPIV)测量了内燃机在发动机转速为1500转/分、曲轴转角的时间分辨率下的速度场，最大测量体积为。为了评估高速体积测量的质量和有效性，在发动机滚动面上用高速立体粒子图像测速仪对HS-TPIV结果进行了验证。为了进一步验证测量质量，进行了广泛的误差估计。最后，利用瞬时三维测量结果，分析了在几个预定曲轴转角下的几个瞬时发动机循环中，湍流和CCV引起的波动对流场的影响。研究显示了内燃机内部流动波动的三维程度，并定性地量化了缸内流动中CCV的影响。
AbstractEngine processes require fundamental knowledge on specific fuel–air mixtures to reduce pollutant emissions, i.e., soot formation,, andgeneration, and to improve engine efficiency. However, the in-cylinder flow field of combustion engines is characterized by time-dependent and highly three-dimensional large-scale flow structures and cycle-to-cycle variations (CCV). This means that high-speed volumetric velocity measurements are required to investigate three-dimensional large-scale flow structures and CCV inside the combustion chamber at high temporal resolution. Since such data are hardly available in the literature, a high-speed tomographic particle image velocimetry (HS-TPIV) setup is used to measure the velocity field in an internal combustion engine at an engine speed of 1500 rpm and at a temporal resolution ofcrank angle in a maximum measurement volume of. To assess the quality and the validity of the high-speed volumetric measurements, the HS-TPIV results are validated using high-speed stereoscopic particle image velocimetry measurements in the engines tumble plane. To further verify the measurement quality, an extensive error estimate is conducted. Finally, the instantaneous, three-dimensional measurement results are used to analyze the impact of fluctuations due to turbulence and CCV on the flow field in several instantaneous engine cycles at several predefined crank angles. The investigation shows the three-dimensional extent of flow fluctuations inside combustion engines and qualitatively quantifies the effect of CCV in in-cylinder flow.Graphic abstract