Rules of Thumb

Bendros diskusijos apie variklius ir ju tuninga.
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spade
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Rules of Thumb

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Kadangi tiek man tiek kitiems gan daznai kyla klausimai ish serijos "o kiek sitie purkstukai palaiko arkliu" ir pan. kai nelabai yra nei noro nei prasmes tiksliai gilintis ir ieshkot formuliu, tai nutariau, kad reikia surashyt tokias visokias grubias "taisykles"... Siulykit kitas, arba tikslinkit shias.


Purkstuku palaikomi arkliai:
cc/min / 5 * cyl.skaichius * duty_cycle = palaikomi_arkliai
(duty cycle neturetu virshyti kokiu 0.85)
Pvz. S13 purkstukai 370cc/min palaikys 370/5*4*0.85=~250Ag

Purkstuku perskaichiavimas ish lb/h i cc/min:
lb/h * 10.5 = cc/min
Pvz. aftermarketiniai purkshtukai 36 lb/h bus 36*10.5= 380 cc/min

Kuro siurblio palaikomos Ag:
lph * 2 = Ag

CFM paversti i lb/min:
cfm / 14 = lb/min

Salyginis CR uzputus atmosferini varikli:
CRf/i = CRn/a * SQR(Bbar)
Bbar - turbinos slegis (absoliutinis) barais
Last edited by spade on 07 Aug 2006, 10:22, edited 2 times in total.
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Post by spade »

Man kazhkaip visad atrode kvaila duslintuvo parinkinejimas pagal variklio turi - tokio paties litrazho varikliu galia (reishkia ishmetamuju duju kiekis) gali skirtis vos ne kokius 10 kartu... Logishkiau butu vamzdi rinktis pagal variklio galia.

Kazhkaip radau pora tokiu lenteliu, kur skersmuo siejamas su galia:

Donaldson (firmos kuri daro duslintuvus sunkvezhimiams) rekomendacijos:
Recommended max pwr; Petrol engine; 2psi back pressure
kW (Hp)_______________inches (mm)
75 (100)________________2 (51)
120 (160)_______________2.5 (64)
165 (220)_______________3 (76)
230 (310)_______________3.5 (89)
375 (500)_______________4 (102)
550 (740)_______________5 (127)
635 (850)_______________6 (152)


Graham Bell lentele:
Blown or nitrous engines
Hp____________________pipe OD in inch(mm)
80-120____________________1.875 (47.5)
110-140___________________2.0 (51)
130-150___________________2.125 (54)
140-185___________________2.25 (57)
180-220___________________2.5 (63.5)
210-265___________________2.75 (70)
250-320___________________3.0 (76)
280-360___________________3.5 (89)
400-500___________________4.0 (101.5)
480-630___________________4.5 (114.5)
580-750___________________5.0 (127)
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Post by spade »

Turbine flow to HP:

cfm / 1.5 = HP
lb/min * 9.5 = HP
kg/s * 1200 = HP
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Re: Rules of Thumb

Post by spade »

Torkas su galingumu susikerta prie (jei mastelis vienodas):
Nm ir kW - 9549 rpm
Nm ir Hp - 7120 rpm
lb-ft ir kW - 7042 rpm
lb-ft ir Hp - 5251 rpm

NB: 1Hp = 0,7457kW, 1lb-ft = 1,356Nm.
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