First, free wake analysis was carried out to calculate the rotor wake geometry and the downwash around the engine jet space.

首先应用自由尾流分析技术来计算旋翼尾迹和发动机绕排流空间的洗流速度。

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They work for the American space agency's Jet Propulsion Laboratory in California.

VOA: special.2009.08.25

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