| 不同前车窗角度对汽车动力性能影响的数值模拟 |
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| 引用本文： | 刘湘云,冯俊虎,郑智贞,陈焕新.不同前车窗角度对汽车动力性能影响的数值模拟[J].北京工业大学学报,2009,35(7):987-990. |
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| 作者姓名： | 刘湘云 冯俊虎 郑智贞 陈焕新 |
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| 作者单位： | 广东工业大学材料与能源学院,广州,510006;华中科技大学能源与动力学院,武汉,430074;中北大学机械工程与自动化学院,太原,030051;华中科技大学能源与动力学院,武汉,430074 |
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| 摘 要： | 汽车车身造型直接影响着汽车运行阻力和运行稳定性,而汽车运行阻力的大小决定了汽车燃油的消耗量.本文对某型车的前窗角分别为20°,30°和45°的汽车周围流场进行了三维数值模拟.汽车车身尺寸为435mm长×168 mm宽×148 mm高.定义了阻力系数和胜利系数,重点分析了汽车为尾流的涡流对于阻力的影响.结果表明,由于不同的前车窗角度,尾流区域的气流分离和重新附着点不同,产生的阻力也不同.最佳的前窗角度是30°,因为此时的流动阻力系数在研究的3个前窗角度中是最低的.流动阻力系数和升力系数与前车窗角度的变化不是线性关系.
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| 关 键 词： | 车身造型 动力学 前窗角 系数 阻力系数 |
Effect of Different Front Window Angles on the Automobile Dynamic Performances |
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| LIU Xiang-yun,FENG Jun-hu,ZHENG Zhi-zhen,CHEN Huan-xin.Effect of Different Front Window Angles on the Automobile Dynamic Performances[J].Journal of Beijing Polytechnic University,2009,35(7):987-990. |
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| Authors: | LIU Xiang-yun FENG Jun-hu ZHENG Zhi-zhen CHEN Huan-xin |
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| Affiliation: | 1.Faculty of Material and Energy;Guangdong University of Technology;Guangzhou 510006;China;2.College of Mechanical Engineering and Automatization;North University of China;TaiYuan 030051;3.School of Energy and Power Engineering;Huazhong University of Science and Technology;Wuhan 430074;China |
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| Abstract: | The shape of a car body influences strongly the stability and moving resistance,which affects the gasoline wastage of a car.The paper simulates the 3-dimentional airflow around automobiles with front window angles of 20°,30° and 45° respectively.The coefficients of flow resistance and of uprising force are defined. The streamline around the car is distributed in detail.Analyzing the result,it can be concluded that optimal front window angle is 30°,because the coefficients of flow resistance and of uprising force are lowest among three front window angles in the study.It means that the coefficient of flow resistance does not increase with increasing the front window angle. |
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| Keywords: | automobile aerodynamics front window angle coefficient |
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