Practical Ship Hydrodynamics Episode 2 pps

...  t  2u x u y C v x u z C w x u y C v x 2v y w y C v z u z C w x w y C v z 2w z     2 3 k 00 0 2 3 k 0 00 2 3 k   k is the (average) kinetic energy of the turbulence: k D 1 2 u 2 C v 2 C ... two-dimensional differential equation of second order: A ∂ 2 f ∂x 2 C 2B ∂ 2 f ∂x∂y C C ∂ 2 f ∂y 2 C a ∂f ∂x C b ∂f ∂y C cf C d D 0 For υ D AC  B 2 > 0 the equation...

Ngày tải lên: 13/08/2014, 09:20

... average is E pot D 1 4 gj O hj 2 The kinetic energy per area is: E kin D  1  1 2  v 2 x C v 2 z  dz D  1  1 2 ω 2 j O hj 2 e 2kz dz ³  1 0 dz D 1 4 gj O hj 2 Here the formulae for v x and ... than 10 4 10 3 10 2 50 40 l (m) 0 0 .2 0.4 0.6 0.8 1.0 1 .2 1.4 1.6 1.8 w e (s −1 ) Ship passes waves 25 kn 20 kn −10 kn −5 kn 0 Following head waves 5 kn 15 kn 30. k...

Ngày tải lên: 13/08/2014, 09:20

... Point source 20 9 6 .2. 2 Regular first-order panel 21 1 6 .2. 3 Jensen panel 21 5 6 .2. 4 Higher-order panel 21 8 6.3 Vortex elements 22 3 6.4 Dipole elements 22 6 6.4.1 Point dipole 22 6 6.4 .2 Thiart ... 23 6 7.1 .2 Numerical implementation 23 7 7 .2 Two-dimensional wave resistance problem 23 8 7 .2. 1 Theory 23 8 7 .2. 2 Numerical implementation 24 1 7.3 Three-d...

Ngày tải lên: 13/08/2014, 09:20

... J Figure 2. 3 Propeller diagram −10 C Q * 2. 6 1.6 1 .2 0.8 0.4 0 −0.4 −0.8 −1 .2 −1.6 0° 40° 80° 120 ° 160° 20 0° 24 0° 28 0° 320 ° 36 0° P / D = 1.6 1.4 1 .2 1.0 0.8 0.6 C T * h C T * P / D = 1.6 1 .2 1.0 0.8 0.6 1.4 −10 C Q * ... blades. 2. 2 Propeller curves Thrust T and torque Q are usually expressed as functions of rpm n in non- dimensional form as: K T D T  Ð n 2 Ð D 4...

Ngày tải lên: 13/08/2014, 09:20

... on 52 Practical Ship Hydrodynamics 6′ 2 6′ 2 6′ 2 K T K Q h h 10 . K Q K T J Figure 2. 11 Influence of cavitation on propeller characteristics 0 5 10 15 20 25 30 °C 1000 20 00 3000 4000 N/m 2 Water ...  c :  c D T q 2 0.7R A p q 0.7R D 1 2 V 2 R V R D  V 2 A C 0.7nD 2 0.5 0.4 0.3 0 .2 0.15 0.08 0.06 0.05 0.1 0.1 0.15 0 .2 0.3 0.4 0.5 0.6 0.8 1.5 2. 0 6′...

Ngày tải lên: 13/08/2014, 09:20

... L 2 i 2 L 2 i3 L i3  L i 2 L i3 C L i 2 /D i CC i DL 2 i1 L 2 i3 L i3  L i1 L i3 C L i1 /D i CD i D L 2 i1 L 2 i 2 L i 2  L i1 L i 2 C L i1 /D i D i D L i1 L i 2 L i3 L i3  ... a thin wall-sided ship as: R w D 4  V 2  2  1 1  2   2  1 jAj 2 d with: A Di  S e  2 zCix fx, z dz dx V is the ship speed, ...

Ngày tải lên: 13/08/2014, 09:20

... 8 20 8 8 467 8 121 6 955 4 845 2 120 822 0 0 0 0 0 0 12. 1 13 .2 95 .2 981 2 185 3 140 3 986 4 659 4 948 4 947 4 726 4 117 3 0 62 2 318 21 5 0 0 0 0 0 13 .2 14.6 97.7 547 1 038 1 527 2 122 2 418 2 633 ... control surface 126 Practical Ship Hydrodynamics O H B D        000 ω 2 e a 22  iω e n 22 0 ω 2 e a 24  iω e n 24 0 ω 2 e a 33  iω e n 33 0 ω...

Ngày tải lên: 13/08/2014, 09:20

... ampli- tude: A 2 z D jhj 2 ju 3 j 2 D ω 3 e g 2 n 33 1.5 1.8 1.4 1 .2 1.0 0.8 0 .2 0.4 0.6 H = 2. 2 H = 0.8 H = 0.8 1.0 1.8 0.6 0.4 0 .2 H = 2. 2 1.8 1.4 1 .2 1.0 0.8 0.6 0.4 0 .2 1.0 0.5 0 1.0 0.5 0 0.6 0.4 0 .2 0 1 .2 1.0 0.8 0.6 0.4 0 .2 0 0.4 0.8 w 2 B / (2 g ) w 2 B / (2 g ) 1 .2 0.4 ... / (2 g ) 1 .2 0.4 0.8 1 .2 w 2 B / (2 g ) w 2 B / (2 g ) 0...

Ngày tải lên: 13/08/2014, 09:20

... 0 N 0 υ 5 2 220 2 622 6 52 2 886 N 0 υ v 2 006 918 2 950 N 0 υr 2 855 0 1 096  329 N 0 υu 2 321 1 856 0 2 259 N 0 υu 2 0 568 0 0 N 0 υ 2 u 316 0 0 0 N 0 υ 3 u 1 538 1 964 0 1 3 82 N 0 vjvj 0 ... 179 2 355 X 0 u 3 0 2 851 0 2 594 X 0 v 2 889 3 908 1 355 3 27 9 X 0 r 2 237 838 151 571 X 0 υ 2 1 598 1 346 696 2 879 X 0 v 2 u 0 1 833 2 463 2 55...

Ngày tải lên: 13/08/2014, 09:20

... 1 .20 1.09 1.18 5.0 1.11 1.17 1 .22 1.10 1 .29 1.47 1.48 7.5 1.15 1 .25 1 .27 1. 12 1.30 1. 52 1.53 10 1.17 1 .27 1 .29 1.14 1 .28 1.50 1. 52 15 1 .20 1.30 1.31 1.18 1 .26 1.47 1.48 20 1 .22 1 .29 1.30 1 .20 ... ˛ s 1.17 1 .26 1.33 1.33 1. 32 1 .25 ˛ s [ ° ] 38.5 28 .7 23 .0 C L /C D at ˛ D 10 ° 8.11 7 .26 10.45 10.35 12. 28 12. 40 C L /C D at ˛ D 20 ° 4. 62 4 .25 5.70 5.79 6.63 7....

Ngày tải lên: 13/08/2014, 09:20