Chap5-4 - 5 4 V V 1 2 1 Fec = F1 1 f v e V 1 = 1A 1 f v e...

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§5- 4 V带带带带带带 带 . 带带带带带带带 V带带带带带带 带带带带带带带 : 1. 带带 2. 带带带带带带 带带带带带带带 : 带带带带带带带带 , 带带带带带带带带带带带带带带带带
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带带带带带带带 : - = - = α α σ v v f 1 f 1 ec e 1 1 A e 1 1 F F 带带 V带带带带带带带带带带带 : [ ] [ ] c 1 b 1 c 1 b 1 max σ σ σ σ σ σ σ σ σ - - + + =
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( 29 1000 A e 1 1 ] [ 1000 F P v f c 1 b ec 0 v v - - - = = α σ σ σ 带带带带带带带带带带带 : 带带带带带 带带带带带带带带带带带带带带带带带带带带带带带带带带带带带 带带带带带 带带带带 P 带带带 ( 带带带带 ) 带带带带带带带带带带带带带 2 1 n , n 带带带带带带 0 P
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带 . 带带带带带带带带带带带 1. 带带带带带带 P K P A d = 带带带带 5—25m/ s = v 2. 带带带带带带 1 d n , P 带带带带带带带带带带 2 1 D , D 3. 带带带带带带带带带 max 1 1 v v × = 1000 60 π n D 带带带带带带带带带带带带 min 1
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