Abstract
In applying Pressure-Sensitive Paint (PSP) to low-speed flow wind tunnel testing, it is important to minimize any measurement uncertainties. There are various error sources such as camera noise, misalignment of images due to model displacement and temperature distribution over the model. Among these factors, the effects of temperature distribution change during tests on pressure measurement accuracies were studied in the present paper. Pressure and temperature distributions over a simplified car model (1/10 scale Ahmed model) were measured using PSP and Temperature-Sensitive Paint (TSP). Sequential images were acquired at the same intervals over the entire test period, including for the conditions before and after the tunnel run. As a result, it was found that the measurement error caused by temperature distribution over the model could be reduced using a single-point temperature measurement. In addition, by measuring surface temperature distributions on the model using TSP, it was proved that the most accurate pressure measurement could be made by rationing the wind-off image acquired immediately after shutting down the tunnel to the wind-on image acquired immediately before shutting down the tunnel. Using the present measurement technique, complicated pressure fields over the Ahmed model were successfully visualized.
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Taro Yamashita: He received his B.S. and M.S. degrees in Aerospace Engineering from Tohoku University in 2003 and 2005 respectively, where he studied the wake behind bluff bodies and the development of a Magnetic Suspension and Balance System. Now he is studying on a Ph.D. course at Tohoku University. His current research topic is the application of molecular sensors to low-speed flow.
Hikaru Sugiura: He received a B.S. degree in Mechanical Engineering from Tokyo Metropolitan University in 2005. And he received a M.S. degree in Aerospace Engineering from Tohoku University in 2007. Now he has been working for IHI Co., Ltd. since 2007.
Hiroki Nagai: He received his Ph.D. degrees in Institute of Engineering Mechanics and Systems from University of Tsukuba in 2000 for a study of shock waves in superfluid helium. He worked from 2001 to 2003 with National Space Development Agency of Japan (Predecessor: Japan Aerospace Exploration Agency (JAXA)) as a researcher, where he engaged in the development of thermal control device and thermal analysis of spacecraft. Since 2003, he worked as a Research Associate at Aerospace Engineering of Tohoku University. His current research topics are to apply PSP measurements in micro devices such as micronozzle, microchannel, and microturbine, and to establish the flow diagnostic technique in micro-scale flow.
Keisuke Asai: He is a Professor of Aerospace Engineering at Tohoku University. He graduated from Kyoto University 1980 and obtained his PhD in Aeronautics and Astronautics from Tokyo University in 1995. He worked for National Aerospace Laboratory (NAL) from 1980 to 2003, before moving to Tohoku University. From 1999 to 2003, he promoted “MOSAIC” that is an interdisciplinary research project to develop molecular sensor technology. His research interests involve development of molecular sensor technology for extreme flow conditions and its applications to cryogenic wind tunnels, hypersonic wind tunnels, and micro-scale gas flows. He is member of AIAA AMT-TC and ICIASF-Panel.
Keitaro Ishida: He has been working for Nissan Motor Co. Ltd. since 1990. Now he belongs to the Measuring Engineering Department. His current work includes developing hydropneumatic measurement, calibration for hydropneumatic measuring instruments, and the development of sensor technology for measurement and flow visualization.
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Yamashita, T., Sugiura, H., Nagai, H. et al. Pressure-Sensitive Paint measurement of the flow around a simplified car model. J Vis 10, 289–298 (2007). https://doi.org/10.1007/BF03181696
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DOI: https://doi.org/10.1007/BF03181696