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Numerical Study of Interaction of Propagated Shock with boundary layer.Behind Contact Surface in Ducts

Journal of Thermal Science 2003年第1期12卷 16-19页

作者： Kazuyuki Kage Katsuya Ishimatsu Toyoyasu Okubayashi Department of Production Systems Engineering Oita University 700 DannoharuDepartment of Production Systems Engineering Oita University 700 Dannoharu OitaDepartment of Production Systems Engineering Oita University 700 Dannoharu Oita Oita 870-1192 Japan 870-1192 Japan870-1192 Japan

The interactions of the shock with the boundary layer.of the cold gas behind the contact in many different conditions.i.e. three kinds of test gases and three kinds of sound speed ratios across the contact,were explored by numerical *** trajectories of the transmitted shock in cold gas flow and the development of shock bifurcation in the process of interaction with boundary layer.are illustrated by many kinds of figures(*** time-distance diagrams of the acoustic impedance contours on the axis,the pressure and density contours and the static pressure distributions on the axis.).

关键词： contact surface shock wave over-tailored condition boundary layer.

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An Integral Research of the Flow of a Liquid Film Along a Vertical Wavy Wall

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Journal of Energy and Power Engineering 2013年第5期7卷 899-902页

作者： Jinsheng Shi College of Mechanical Engineering Tianjin University of Science & Technology Tianjin 300222 China

An approximate research on the flow of a two dimensional, steady laminar liquid film along a vertical, long periodic wavy wall is conducted based on boundary layer.integration. An ordinary equation about the film evolution is derived. By analyzing the integral equation of the hydrodynamic boundary layer.under different Reynolds number domains, the flow characteristics are studied preliminarily. Influences of wall waviness, flow rate on the film development are discussed.

关键词： Liquid film wavy wall boundary layer.

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Experimental Confirmation on the Calibration Curves for Preston＇s Method

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Journal of Energy and Power Engineering 2014年第4期8卷 689-692页

作者： Toshihide Ota Shigeo Kimura Takahiro Kiwata Nobuyoshi Komatsu Takaaki Kono Graduate School of Natural Science and Engineering Kanazawa University Kakuma-machi Kanazawa-shi Ishikawa 920-1192 Japan Institute of Nature and Environmental Technology Kanazawa University Kakuma-machi Kanazawa-shi lshikawa 920-1192Japan Faculty of Mechanical Engineering Kanazawa University Kakuma-machi Kanazawa-shi Ishikawa 920-1192 Japan

The Preston＇s method is considered as one of the most commonly employed methods to measure the wall shear stress. However, it is only possible to determine the wall shear stress from measured pressure differences of the Preston tube and undisturbed static pressure, combined with calibration curves, which depend on the Preston tube diameter, fluid density, and viscosity. Since its invention, no significant advancement in theory has been made, and calibration curves proposed by Preston, Patel and Bechert are still in use. In the present study, a need to measure surface shear stress over a circular cylinder prompted us to develop our original Preston tube system. The developed system has been calibrated by measuring the wall shear stress in the fully developed turbulent flow regime in a circular pipe. The present results generally confirm the previously reported calibration curves. A slight modification of the coefficients in the calibration equation shows further improvement.

关键词： Preston's method wall shear stress boundary layer.

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Asymptotic behavior of the shock solution for a class of nonlinear equations

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Progress in Natural Science:Materials International 2003年第10期 48-50页

作者： MO Jiaqi 1*, ZHU Jiang 2 and WANG Hui 3(1. Department of Mathemtics, Anhui Normal University, Wuhu 241000, China 2. ICEES, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 3. National Natural Science Foundation of China, Beijing 100085, China) Department of Mathemtics Anhui Normal University Wuhu 241000 China ICEES Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China National Natural Science Foundation of China Beijing 100085 China

The high precision approximation of the shock solution for a class of nonlinear problems is obtained using a simple method.

关键词： nonlinear equation shock boundary layer.

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