| 直背式轿车加速行驶气动阻力的计算 |
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| 引用本文： | 宗叶玲,康宁.直背式轿车加速行驶气动阻力的计算[J].航空动力学报,2008,23(7):1299-1303. |
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| 作者姓名： | 宗叶玲 康宁 |
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| 作者单位： | 北京航空航天大学 汽车工程系, 北京 100083 |
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| 摘 要： | 用CFD方法对直背式轿车加速过程中非定常外流场进行了数值模拟,计算出不同速度及加速度情况下汽车的气动阻力.结果表明某一速度和加速度情况下气动阻力主要与此刻的速度和加速度有关,其他因素对它的影响较小,并通过两次线性拟合,得出阻力与速度及加速度的计算公式,该公式可以直接计算出汽车在加速行驶时在某一速度和加速度值下的气动阻力.
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| 关 键 词： | 气动阻力 直背式轿车 汽车外流场 加速 计算公式 |
| 收稿时间： | 2007/6/28 0:00:00 |
| 修稿时间： | 2007/9/11 0:00:00 |
Computation of aerodynamic drag of a fastback car in accelerating process |
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| ZONG Ye-ling and KANG Ning.Computation of aerodynamic drag of a fastback car in accelerating process[J].Journal of Aerospace Power,2008,23(7):1299-1303. |
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| Authors: | ZONG Ye-ling and KANG Ning |
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| Institution: | Department of Automobile Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | Three dimensional unsteady flow field around a simplified fastback car in process of accelerating was simulated numerically with computational fluid dynamics(CFD)method.The aerodynamic drags were calculated at different speeds and different accelerations.The calculated results show that the aerodynamic drag at a certain speed and acceleration are closely related to the current speed and acceleration.Through twice linear fittings,the computational formula of aerodynamic drags was obtained.This formula could work out immediately the aerodynamic drag of the aerodynamic characteristics of a car in accelerating process at a certain speed and acceleration value. |
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| Keywords: | aerodynamic drag fastback car outflow field of a car accelerating computational formula |
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