In a centrifugal fan (Fig. 1.118(a)), the air at any point is subjected to an impulse each

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In a centrifugal fan (Fig. 1.118(a)), the air at any point is subjected to an impulse each time a blade passes the point, as shown in Fig. 1.118(b). The frequency of these impulses is determined by the speed of rotation of the impeller \(n\) and the number of blades, \(N\), in the impeller. For \(n=100 \mathrm{rpm}\) and \(N=4\), determine the first three harmonics of the pressure fluctuation shown in Fig. 1.118(b).

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Mechanical Vibrations

ISBN: 9780134361925

6th Edition

Authors: Singiresu S Rao

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