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首页> 外文会议>Selected Papers from the 9th International Symposium on Laser Techniques Applied to Fluid Mechanics Lisbon, Portugal, July 13-16, 1998 >V.5. PIV Measurements during combustion in a reciprocating internal combustion engine
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V.5. PIV Measurements during combustion in a reciprocating internal combustion engine

机译：V.5。往复式内燃机燃烧过程中的PIV测量

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Two-dimensional particle image velocimetry (PIV) measurements were made in the burned and unburned gas of a firing, reciprocating internal-combustion engine. Cross correlation was used to analyze the double-exposure photographs using a 1.25 mm interrogation sport on a 0.5 mm grid. Electrooptical image shifting was used to resolve the directional ambiguity. The particle properties and the seeding density are the two key features enabling simultaneous measurements in the burned-and unburned-gas regions. The flame coordinates were identified as the interface between the low and high seding density regions on the PIV photographs. Those coordinates were used to identify the burned and unburned regions of the velocity distribution. High-pass spatial filtering is used to visualize coherent structures of spatial scales L, where 1.25 mm < L < 10 mm. Vorticity and strain-rate distribution are computed from the instantaneous velocity. PDFs of these distributions were computed, conditionally smapled on the burned gas, unburned gas and proximity to the flame front. For this paper, analysis of only one realization is presented in detail in order to maintain a manageable number of illustrations yet demonstrate flow properties observed in fifteen recorded realizations.
机译：在燃烧的往复式内燃机的燃烧气体和未燃烧气体中进行了二维粒子图像测速（PIV）测量。互相关用于在0.5 mm网格上使用1.25 mm询问运动来分析两次曝光的照片。电光像移用于解决方向模糊性。颗粒特性和播种密度是两个关键特征，可在燃烧和未燃烧气体区域同时进行测量。火焰坐标被确定为PIV照片上低和高seding密度区域之间的接口。这些坐标用于识别速度分布的燃烧区域和未燃烧区域。高通空间滤波用于可视化空间尺度L的相干结构，其中1.25 mm

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