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发表于 2012-3-11 17:44:59
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准定常流动的准确定义
不才以为Wright&Cooper的定义最准确,说得也最清楚:
The quasi-steady assumption is to assume that at any instant of time the aerofoil behaves with the characteristics of the same aerofoil moving with constant heave and/or pitch velocities equal to the instantaneous values, which implies that there are no frequency-dependent effects.
参见Introduction to Aircraft Aeroelasticity and Loads, 2007, page 153.
姚一龙译/崔尔杰校的版本大致是这样说的:
准定常假设就是假定在任何瞬间该翼型的气动特性都与同一翼型以等速度进行沉浮和/或俯仰运动时所显现的气动特性一致,而这些速度应当等于该运动翼型在该时间相应的瞬态值,这意味着不计及与频率的依赖关系。 |
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