A HYBRID APPROACH FOR 3D FULL-FIELD MEASUREMENT ON A CLOSED SLINGER   COMBUSTOR BY HYDRAULIC SIMULATIONS

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	A HYBRID APPROACH FOR 3D FULL-FIELD MEASUREMENT ON A CLOSED SLINGER COMBUSTOR BY HYDRAULIC SIMULATIONS
	Jia, Lichao ; Yang, Lili ; Yuan, Huijing ; Jia, Yongxia ; Wang, Yiyang ; Feng, Yang
	2017
关键词	PARTICLE TRACKING VELOCIMETRY 3-DIMENSIONAL FLOWS IMAGE VELOCIMETRY
英文摘要	This hybrid approach proposed in the present study is a mixture algorithm of the 3D PTV and Tomo-PIV based on a two camera system, which is able to measure the flow field in a closed system with high refractive without in situ calibration. Knowing the calibration data in the air and refractive indices of different optical media, a simplified multimedia photogrammetry model is established based on the least square method. A new particle matching algorithm using the concept of match probability between the twin image frames has been developed to reconstruct the physical position of the particles. In order to overcome the disadvantage of low particle density, time-resolved PIV is utilized at a sampling rate being 2000 Hz to acquire the instantaneous particle images. Then, the spectrum superposition of the cross-correlation distribution is applied to increase the signal-to-noise ratio in the velocity prediction. The technique proposed here can be used to overcome the difficulty in conventional calibration method for closed measurement objects. Both the computer simulation and some experiments imaging a calibration target reference field are conducted to show the accuracies of the calibration and reconstruction process. The capability of the technique in real experimental conditions is assessed with the measurement of the flow structure in a closed slinger combustor by hydraulic simulations.; National Natural Science Funds of China [11372009]; CPCI-S(ISTP)
会议录	ASME Turbo Expo: Turbine Technical Conference and Exposition
语种	英语
内容类型	会议论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/480761]
专题	工学院
推荐引用方式 GB/T 7714	Jia, Lichao,Yang, Lili,Yuan, Huijing,et al. A HYBRID APPROACH FOR 3D FULL-FIELD MEASUREMENT ON A CLOSED SLINGER COMBUSTOR BY HYDRAULIC SIMULATIONS[C]. 见:.