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Category > Applied Sciences Posted 23 May 2017 My Price 6.00

The impeller of a centrifugal fan has an inner radius of 250 mm

The impeller of a centrifugal fan has an inner radius of 250 mm and width of 187.5 mm; the values at exit are 375 mm and 125 mm respectively. There is no whirl at inlet, and at outlet the blades are backward-facing at 70◦ to the tangent. In the impeller there is a loss by friction of 0.4 times the kinetic head corresponding to the relative outlet velocity, and in the volute there is a gain equivalent to 0.5 times the kinetic head corresponding to the absolute velocity at exit from the runner. The discharge of air is 5.7 m3 ·s−1 when the rotational speed is 84.8 rad ·s−1 (13.5 rev/s). Neglecting the thickness of the blades and whirl slip, determine the head across the fan and the power required to drive it if the density of the air is sensibly constant at 1.25 kg · m−3 throughout and mechanical losses account for 220 W.

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Alpha Geek
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Status NEW Posted 23 May 2017 10:05 AM My Price 6.00

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file 1495536215-Answer.docx preview (196 words )
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