The similarity of rotor-wing down-wash flow field is studied.
研究了直升机旋翼下洗流场的相似性。
Combining momentum theory and vortex theory, rotor circulation equation was deduced. The rotor down-wash flow field was calculated using generalized down-wash flow model.
结合动量理论和涡流理论，推导了桨叶环量方程，用广义尾流模型计算了旋翼下洗流场。
Every time we wash our jeans, tiny bits of denim will flow out of our washing machines, down into the world's rivers, lakes and oceans.
每次我们洗牛仔裤的时候，小块的牛仔布就会从洗衣机里流出来，流入世界上的河流、湖泊和海洋。
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