脉动升力系数先随含气率的增大而缓慢增加，在含气率增大到0.1后增大得较快。
The oscillating lift coefficient increases with the growth of the void fraction in such a way that it increases slowly before the void fraction up to 0.1 and after that, increases faster.
根据升力系数的脉动量急剧上升的起始点确定抖振起始边界。
The buffet onset boundary is defined as the beginning point where the fluctuating values of aerodynamic coefficients are increased suddenly.
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