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9437197 Numerical analysis and visualization experiments on the flow of air past a finned heat exchanger
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Abstracts 1994 JSAE Autumn Contention/.ISAE Reciew 16 (1995) 95-113
On our first paper, a LA system was introduced for engine evaluation testings at engine dynamo lab.. This paper describes a new chassis dynamo lab. automation system, providing total support for measurements and analyses of very large transient data. The new system is capable of very large transient data handling by means of newly developed computer applications, such as data extraction. This system is much contributing to time efficient engine development through various parameter studies, data accumulation, data reusing. 9437124 Development of Grid Generation and Visualization System for Flow and Combustion CAE of I.C. Engine Hiroko Kokita, Yasuo Yoshikawa, Kimiomi Maruyama, Ken Naitoh, Yasuo Takagi (Nissan Motor Co., Ltd.), pp. 125-128, 6 figs., 2 tables, 4 refs. Since capability of computational fluid dynamics (CFD) has been enhanced to analyze air flow, mixture formation and combustion in engine, CAE based on CFD is used as an effective tool in engine research and development. Techniques for pre- and post-processing of the analysis are as important as those for solving CFD itself in the standpoint of accuracy as well as the length of the development period. The authors have developed techniques to generate computational grid for CFD analysis in less time, and have improved work efficiency by adopting a visualization system which uses best of the authors" computer environment. 9437133 A Study of the Aerodynamic Interferences between Vehicles: In Case of a Light Van and a Bus in a Tunnel Motoharu Yokouchi (Osaka Sangyo University Graduate school), Yoshikazu Kat~ (Osaka Sangyo University), pp. 129-132, 12 figs., 1 ref. This paper describes on the aerodynamic interferences on a light van caused by a bus in a tunnel. Aerodynamic experiments have been made for a ight van and a bus with same speed in close proximity in tunnel The drag, side force and yawing moment acting on a light van were measured for different distances between a light van and a bus. In addition, the pressure distributions around a light van were measured. The results are compared with those on open road. 9437142 Aerodynamic Simulations of an Automobile with Door Mirror Katuya Uchida, Kenji Okumura, Toshihiko Kuriyama (DAIHATSU MOTOR CO., LTD), pp. 133-136, 14 figs., 11 refs. The flow around front pillar with a door mirror is investigated in this paper. Computational fluid dynamic simulations show good agreements with experimental data by Tuft method, Consequently it is found that the flow around door mirror interferes with the flow from front pillar, furthermore the turbulence kinetic energy of these flows correlate with the experimental sound pressure level of side window surface. 9437151 Flow Visualization and Measurement in the Stator of a Torque Converter Hisashi Watanabe, Kazunori Yoshida, Masatoshi Yamada (Toyota Central Res. & Develop. Labs., Inc.), Masahiro Kojima (Toyota Motor Corporation), pp. 137-140, 10 figs., 5 refs. We proposed a new experimental apparatus to visualize and measure the flow in the stator of a torque converter. A one-sided coaxial shaft constructed of an input shaft and an output shaft gives a measuring open space inside the stator shaft. Through the window on the stator shaft, the flow in the stator can be directly observed. By visualizing the flow with an oil-film method and a tuft method, separated regions near the blade surface and flow patterns in the blade passage were observed. Furthermore, using a laser doppler velocimeter, velocity vectors and turbulence intensities were measured in the inlet, outlet flow and the separated flow in the blade passage of the stator. 9437160 Effects of Cone Shape on Flows in Centrifugal Fan Katsuichi Yamamoto (Zexel Co., Ltd.), Masaaki Kawahashi, Hiroyuki Hirahara (Saitama University), Osamu Sekimoto (Graduate School of Saitama University), pp. 141-144, 10 figs., 5 refs. In order to study flows through blades of a centrifugal fan. a
simplified actual test model of the fan is presented, and the flows in the model are investigated qualitatively and quantitatively by visualization technique. At the same time, a simplified numerical method for three dimensional analysis of the flows in the model is applied to the model. Both of the experimental and analytical results are in good agreement. 9437179 Velocity Measurement by Flow Visualization and Image Analysis for Car Air Conditioners Toshiyuki Hasegawa, Takeshi Miyamoto and Takashi Kobayashi (ZEXEL Corporation), pp. 145-148, 14 figs., 8 refs. A measurement method with digital image processing and flow visualization technique has been developed for application to car air conditioners. The present method is effective for measuring complicated flows and relatively high velocity flows. 2-D and 3-D measurement examples were demonstrated to test the method for the accuracy and the applicability. It is shown that the accuracy of this measurement is as high as conventional methods using image analysis, and also shown that the present method is very useful in flow velocity measurement to develop car air conditioners. 9437188 Flow Analysis of Cross Flow Fan: Internal Flow Analysis Analyzed by Numerical Method Motohiro Kitada, Shigeru Akaike, Atsushi Shinma, Hitoshi Taira (NIPPONDENSO Co., LTD.), pp. 149152, 1 l figs., 4 refs. The internal flow of a cross flow fan have an effect on the fan performance, and the formation of this flow is fixed by the fan system configuration. This internal flow, however, is more complex, and the design method for a cross flow fan has not stablished yet. In this study, the authors simulated the internal flow by the numerical method. That result was compared with the experimental result measured by Laser Doppler Anemometer, and good agreement was obtained, Based on the numerical result, the authors improved the scroll casing to reduce the flow turbulence and rapidly pressure change, and could get the higher performance cross flow fan configuration for the vehicle. This report suggests the design method for the higher performance cross flow fan. 9437197 Numerical Analysis and Visualization Experiments on the Flow of Air past a Finned Heat Exchanger Shigenobu Itoh, Yuushi Katoh, Takashi Kobayashi (ZEXEL R&D Center) Toyoaki Yoshida, Takashi Yamane (NAL), pp. 153-156, 13 figs., 9 refs. Numerical simulation of the velocity and temperature distribution in a finned heat exchanger was performed. The simulation was carried out by taking into account the temperature dependence of physical properties of air. In order to observe a velocity field, visualization experiments on the flow through large-scale models of louvered fin array were conducted by using hydrogen bubble and dye injection techniques. We found then a good agreement between the numerical simulation and the flow visualization experiment. By way of trial, we calculate the 3-D velocity and temperature distribution around a slant louvered fin and newly designed one.
9437205 A Basic Study on Vuilleumier Cycle Refrigerator Takao lwasaki, Takashi Kobayashi, Shunichi Furuya, Hitoshi Terauchi, Shouichi Kido (ZEXEL Corporation), pp. 157-160, 6 figs., 2 tables, 5 refs. A Vuilleumier cycle refrigerator, which is one of non-Freon refrigerators for air conditioning, was constructed for an experimental study on the refrigeration characteristics. To investigate the influence of wire gaze regenerators on the cooling capacity of the Vuilleumier refrigerator, different mesh sizes were tested. In the case of the largest mesh size of the wire gazes, the cooling capacity was lower than the capacity in the other cases. Theoretical analysis suggests that, excepting the largest mesh, the meshes have relatively high regenerator efficiency. 9437214 Development of Magnesium Forged Wheel Makoto Fujita (Mazda Motor Corporation), Yukio Yamamoto, Nobuo Sakate, Shoji Hirahara, pp. 161-164, 11 figs., 2 tables, 2 refs.
Abstracts 1994 JSAE Autumn Contention/.ISAE Reciew 16 (1995) 95-113
On our first paper, a LA system was introduced for engine evaluation testings at engine dynamo lab.. This paper describes a new chassis dynamo lab. automation system, providing total support for measurements and analyses of very large transient data. The new system is capable of very large transient data handling by means of newly developed computer applications, such as data extraction. This system is much contributing to time efficient engine development through various parameter studies, data accumulation, data reusing. 9437124 Development of Grid Generation and Visualization System for Flow and Combustion CAE of I.C. Engine Hiroko Kokita, Yasuo Yoshikawa, Kimiomi Maruyama, Ken Naitoh, Yasuo Takagi (Nissan Motor Co., Ltd.), pp. 125-128, 6 figs., 2 tables, 4 refs. Since capability of computational fluid dynamics (CFD) has been enhanced to analyze air flow, mixture formation and combustion in engine, CAE based on CFD is used as an effective tool in engine research and development. Techniques for pre- and post-processing of the analysis are as important as those for solving CFD itself in the standpoint of accuracy as well as the length of the development period. The authors have developed techniques to generate computational grid for CFD analysis in less time, and have improved work efficiency by adopting a visualization system which uses best of the authors" computer environment. 9437133 A Study of the Aerodynamic Interferences between Vehicles: In Case of a Light Van and a Bus in a Tunnel Motoharu Yokouchi (Osaka Sangyo University Graduate school), Yoshikazu Kat~ (Osaka Sangyo University), pp. 129-132, 12 figs., 1 ref. This paper describes on the aerodynamic interferences on a light van caused by a bus in a tunnel. Aerodynamic experiments have been made for a ight van and a bus with same speed in close proximity in tunnel The drag, side force and yawing moment acting on a light van were measured for different distances between a light van and a bus. In addition, the pressure distributions around a light van were measured. The results are compared with those on open road. 9437142 Aerodynamic Simulations of an Automobile with Door Mirror Katuya Uchida, Kenji Okumura, Toshihiko Kuriyama (DAIHATSU MOTOR CO., LTD), pp. 133-136, 14 figs., 11 refs. The flow around front pillar with a door mirror is investigated in this paper. Computational fluid dynamic simulations show good agreements with experimental data by Tuft method, Consequently it is found that the flow around door mirror interferes with the flow from front pillar, furthermore the turbulence kinetic energy of these flows correlate with the experimental sound pressure level of side window surface. 9437151 Flow Visualization and Measurement in the Stator of a Torque Converter Hisashi Watanabe, Kazunori Yoshida, Masatoshi Yamada (Toyota Central Res. & Develop. Labs., Inc.), Masahiro Kojima (Toyota Motor Corporation), pp. 137-140, 10 figs., 5 refs. We proposed a new experimental apparatus to visualize and measure the flow in the stator of a torque converter. A one-sided coaxial shaft constructed of an input shaft and an output shaft gives a measuring open space inside the stator shaft. Through the window on the stator shaft, the flow in the stator can be directly observed. By visualizing the flow with an oil-film method and a tuft method, separated regions near the blade surface and flow patterns in the blade passage were observed. Furthermore, using a laser doppler velocimeter, velocity vectors and turbulence intensities were measured in the inlet, outlet flow and the separated flow in the blade passage of the stator. 9437160 Effects of Cone Shape on Flows in Centrifugal Fan Katsuichi Yamamoto (Zexel Co., Ltd.), Masaaki Kawahashi, Hiroyuki Hirahara (Saitama University), Osamu Sekimoto (Graduate School of Saitama University), pp. 141-144, 10 figs., 5 refs. In order to study flows through blades of a centrifugal fan. a
simplified actual test model of the fan is presented, and the flows in the model are investigated qualitatively and quantitatively by visualization technique. At the same time, a simplified numerical method for three dimensional analysis of the flows in the model is applied to the model. Both of the experimental and analytical results are in good agreement. 9437179 Velocity Measurement by Flow Visualization and Image Analysis for Car Air Conditioners Toshiyuki Hasegawa, Takeshi Miyamoto and Takashi Kobayashi (ZEXEL Corporation), pp. 145-148, 14 figs., 8 refs. A measurement method with digital image processing and flow visualization technique has been developed for application to car air conditioners. The present method is effective for measuring complicated flows and relatively high velocity flows. 2-D and 3-D measurement examples were demonstrated to test the method for the accuracy and the applicability. It is shown that the accuracy of this measurement is as high as conventional methods using image analysis, and also shown that the present method is very useful in flow velocity measurement to develop car air conditioners. 9437188 Flow Analysis of Cross Flow Fan: Internal Flow Analysis Analyzed by Numerical Method Motohiro Kitada, Shigeru Akaike, Atsushi Shinma, Hitoshi Taira (NIPPONDENSO Co., LTD.), pp. 149152, 1 l figs., 4 refs. The internal flow of a cross flow fan have an effect on the fan performance, and the formation of this flow is fixed by the fan system configuration. This internal flow, however, is more complex, and the design method for a cross flow fan has not stablished yet. In this study, the authors simulated the internal flow by the numerical method. That result was compared with the experimental result measured by Laser Doppler Anemometer, and good agreement was obtained, Based on the numerical result, the authors improved the scroll casing to reduce the flow turbulence and rapidly pressure change, and could get the higher performance cross flow fan configuration for the vehicle. This report suggests the design method for the higher performance cross flow fan. 9437197 Numerical Analysis and Visualization Experiments on the Flow of Air past a Finned Heat Exchanger Shigenobu Itoh, Yuushi Katoh, Takashi Kobayashi (ZEXEL R&D Center) Toyoaki Yoshida, Takashi Yamane (NAL), pp. 153-156, 13 figs., 9 refs. Numerical simulation of the velocity and temperature distribution in a finned heat exchanger was performed. The simulation was carried out by taking into account the temperature dependence of physical properties of air. In order to observe a velocity field, visualization experiments on the flow through large-scale models of louvered fin array were conducted by using hydrogen bubble and dye injection techniques. We found then a good agreement between the numerical simulation and the flow visualization experiment. By way of trial, we calculate the 3-D velocity and temperature distribution around a slant louvered fin and newly designed one.
9437205 A Basic Study on Vuilleumier Cycle Refrigerator Takao lwasaki, Takashi Kobayashi, Shunichi Furuya, Hitoshi Terauchi, Shouichi Kido (ZEXEL Corporation), pp. 157-160, 6 figs., 2 tables, 5 refs. A Vuilleumier cycle refrigerator, which is one of non-Freon refrigerators for air conditioning, was constructed for an experimental study on the refrigeration characteristics. To investigate the influence of wire gaze regenerators on the cooling capacity of the Vuilleumier refrigerator, different mesh sizes were tested. In the case of the largest mesh size of the wire gazes, the cooling capacity was lower than the capacity in the other cases. Theoretical analysis suggests that, excepting the largest mesh, the meshes have relatively high regenerator efficiency. 9437214 Development of Magnesium Forged Wheel Makoto Fujita (Mazda Motor Corporation), Yukio Yamamoto, Nobuo Sakate, Shoji Hirahara, pp. 161-164, 11 figs., 2 tables, 2 refs.