Liu Zhiyong, Zhang Changfeng, Dai Chengguo. Application of oil film interferometry technique at Mα=8[J]. Journal of Experiments in Fluid Mechanics, 2015, (6): 74-78. DOI: 10.11729/syltlx20150020
Citation: Liu Zhiyong, Zhang Changfeng, Dai Chengguo. Application of oil film interferometry technique at Mα=8[J]. Journal of Experiments in Fluid Mechanics, 2015, (6): 74-78. DOI: 10.11729/syltlx20150020

Application of oil film interferometry technique at Mα=8

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  • The application of oil film interferometry (OFI)technique at Ma=8 was conducted in the Φ0.5m hypersonic wind tunnel.Accurate viscosity coefficient of the oil film was derived from the viscosity-temperature curve by analyzing the infrared images which were recorded simul-taneously with the fringe pictures.Based on the marker spots,the relationship between infrared images and fringe pictures was figured out.A test of skin friction measurement on a flat plate model using OFI technique was conducted.The results show that the standard derivation of the measured viscosities to the mean value is less than 10%.Test results are consistent with the the-oretical estimation according to boundary layer theory for laminar flow on a flat plate.
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