–ฺŽŸƒ‚ƒNƒW‚ึ‡—ฌƒSƒEƒŠƒ…ƒE_•ชŠ๒ƒuƒ“ƒLƒภจƒม Gardel‚ฬŽฎƒVƒL
TŽšŠว•ช‡—ฌ
‡—ฌƒSƒEƒŠƒ…ƒE•ชŠ๒ƒuƒ“ƒL‘นŽธƒ\ƒ“ƒVƒcŒW”ƒPƒCƒXƒE
f=-qƒภ^2{(1.2-ใƒฯ){(cosƒฦ)/ƒี-1}+0.8(1-1/ƒี^2)-(1-ƒี)(cosƒฦ/ƒี}-(1+qƒภ){0.92+qƒภ(2.92-ƒี)}
f 0.683 @
@ –{Šวƒzƒ“ƒJƒ“ƒม ŽxƒVŠวƒJƒ“ƒภ @
Œ๛ŒaƒRƒEƒPƒC D 90 65 mm
’f–สฯƒ_ƒ“ƒƒ“ƒZƒL A 0.00636255 0.003318738 m^2
—ฌ—สƒŠƒ…ƒEƒŠƒ‡ƒE Q 5.37 3 m3/min
qƒภ=-Qƒภ/Qƒม -0.6 @
ƒี=Dƒภ/Dƒม 0.72 @
ƒฦ 90 ‹
ˆณ—อƒAƒcƒŠƒ‡ƒN‘นŽธƒ\ƒ“ƒVƒc hf qƒภ ‘นŽธƒ\ƒ“ƒVƒcŒW”ƒPƒCƒXƒE  f
hf=f*v^2*ƒฯ0/2 81.43 Pa/ŒยƒR ƒี
‡—ฌƒSƒEƒŠƒ…ƒEŒใƒS—ฌ‘ฌƒŠƒ…ƒEƒ\ƒN v 14.067 m/s 1.00 0.69 0.44 0.28 0.16
‹C‘ฬƒLƒ^ƒC–ง“xƒ~ƒcƒh ƒฯ0 1.205 kg/m3 0.0 -1.00 -1.00 -1.00 -1.00 -1.00
-0.1 -0.80 -0.50 -0.50 -0.50 0.00
-0.2 -0.40 -0.20 0.00 0.10 1.00
-0.3 -0.10 0.00 0.20 1.00 2.80
-0.4 0.00 0.20 0.80 1.70 5.00
-0.5 0.20 0.40 1.20 3.00 8.00
-0.6 0.30 0.80 1.80 4.00 11.50
-0.7 0.40 1.00 2.20 5.20 15.50
-0.8 0.50 1.20 3.00 7.00 20.00
-0.9 0.80 1.50 3.50 8.70 25.50
-1.0 1.00 2.00 4.00 10.20 31.00