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Where is the limit of rationality?. Kus on mõstlikkuse piir?. v. T. R. 1. Speed is above all!(??) Or speed as an end in itself?. Affected by three main faktors:. Power. Efficiency. Source:http://images.gougle.com. Source:http://images.gougle.com. Resistance.
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Where is the limit of rationality? Kus on mõstlikkuse piir? SI:KI:PING Prof Anatoli Alop
v T R 1. Speed is above all!(??)Or speed as an end in itself? Affected by three main faktors: Power Efficiency Source:http://images.gougle.com Source:http://images.gougle.com Resistance SI:KI:PING Prof Anatoli Alop Source: H. Punab, Laeva jõuseadmed. Tallinn, 2008
The ways for speed increasing 1. More power ? SHIP PROPULSION PERFORMANCE Source:http://images.gougle.com SI:KI:PING Prof Anatoli Alop
The ways for speed increasing The better propulsive coefficient? Source:http://images.gougle.com SI:KI:PING Prof Anatoli Alop
The ways for speed increasing Ship propulsion devices A. Active devices Sail Flettner Rotor Source:http://images.gougle.com SI:KI:PING Prof Anatoli Alop
The ways for speed increasing B. Re-active devices I Paddle-wheel η< 0,5 Oars Voith-Schneider propeller, η< 0,5 (for speed more than 20 knots) SI:KI:PING Prof Anatoli Alop Source:http://images.gougle.com
The ways for speed increasing B. Re-active devices II Propeller on a modern mid-sized merchant vessel Ship propeller from 1843 η = 0,7 ... 0,75 Source: http://en.wikipedia.org/wiki/Propeller SI:KI:PING Prof Anatoli Alop
The ways for speed increasing B. Re-active devices II Water-jet-propulsion system Source:http://images.gougle.com SI:KI:PING Prof Anatoli Alop
The ways for speed increasing Perfection of propellers Source:http://images.gougle.com SI:KI:PING Prof Anatoli Alop
Examples http://www.youtube.com/watch?v=qgSfrqAYopg http://www.youtube.com/watch?v=RI9zRXmowO8&feature=related http://www.youtube.com/watch?v=2pQga7jxAyc http://www.youtube.com/watch?v=VuobfwRo-IE http://www.youtube.com/watch?v=FJzK_S5ipc4 http://www.youtube.com/watch?v=meDcNK0-tio http://www.youtube.com/watch?v=GZaPmnJKC0A http://www.youtube.com/watch?v=0hWdvw1TTZg http://www.youtube.com/watch?v=qg14dKSByM8 SI:KI:PING Prof Anatoli Alop
The ways for speed increasing Perfection of propulsion systems Source:http://images.gougle.com SI:KI:PING Prof Anatoli Alop
Cavitation http://www.youtube.com/watch?v=GpklBS3s7iU SI:KI:PING Prof Anatoli Alop Source:http://images.gougle.com
1 2 a 3 v a 2 The ways for speed increasing Decreasing of fluid resistance? • The main types of resistance: • Friction resistance • Form resistance 1 – vaba voolu ala 2 – piirikiht 3 – hüdrodünaamiline jälg (kiiluvesi) Source: H. Punab, Laeva jõuseadmed. Tallinn, 2008 SI:KI:PING Prof Anatoli Alop
v vmax vmin vmin + p 0 - The ways for speed increasing The main types of resistance: 3. Wave making resistance Source: H. Punab, Laeva jõuseadmed. Tallinn, 2008 SI:KI:PING Prof Anatoli Alop
Vöörilainete süsteem Ahtrilainete süsteem Lahknevad lained Põiklained Joon. 2.6 The ways for speed increasing The main types of resistance: 3. Wave making resistance SI:KI:PING Prof Anatoli Alop
Body in fluid SI:KI:PING Prof Anatoli Alop
Examples http://www.youtube.com/watch?v=5fQkhTl0LYA SI:KI:PING Prof Anatoli Alop