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首页> 外文期刊>American journal of physics >Determination of aerodynamic drag coefficients using a drop test with a wireless accelerometer and its application to model rockets
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Determination of aerodynamic drag coefficients using a drop test with a wireless accelerometer and its application to model rockets

机译:使用无线加速度计的落滴测试确定空气动力学阻力系数及其应用于模型火箭

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摘要

The use of drag coefficients to quantify the drag force on objects moving through air is a key concept in aerodynamics. However, gaining access to a wind tunnel, the conventionally used apparatus with which to measure drag coefficients, can be difficult for students and educators at the undergraduate level. Several methods have been proposed as alternatives to the wind tunnel, but these often suffer from experimental complexity. In this paper, we propose a straightforward method using a wireless accelerometer to eliminate several common drawbacks of previous methods, enabling a simpler and direct analysis of drag. Here, we describe the method and its validation along with an application to model rockets as a possible undergraduate laboratory experiment. We also discuss an inconsistency regarding the drag coefficient of a typical model rocket and use it as an example of not taking published results at face value.
机译:使用拖动系数量化通过空气移动的物体上的阻力是空气动力学中的关键概念。 然而,获得对风洞的进入,常规使用的用于测量阻力系数的常规使用的设备,对学生和教育工作者来说可能难以在本科水平处困难。 已经提出了几种方法作为风洞的替代品,但这些方法经常遭受实验复杂性。 在本文中,我们提出了一种使用无线加速度计的直接方法,以消除先前方法的几个常见缺点,从而能够更简单地分析拖动。 在这里,我们描述了该方法及其验证以及将火箭作为可能的本科实验室实验模拟火箭的应用。 我们还讨论了关于典型模型火箭的拖动系数的不一致,并使用它作为未在面值上发布结果的示例。

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