OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
These regions are at the joint of the vane and the impeller hub and approximately at 1/3 length along the vane tip. It
may also be noted that other areas of the vane, such as the vane face are relatively unaffected and thus do not
fracture.
This analysis is verified in dry run simulations where impeller vanes are known to break from the above two regions
only
Fig 6 displacement of vane with undisplaced position overlay
Fig 6 indicates the relative displacement magnitude w.r.t the original position over the whole geometry. It is seen that
the impeller vane first starts moving from one face because of unequal friction coefficients.
Fig 7 indicates the stress distribution over the whole geometry. A higher stress at a point indicates a higher chance of
failure at that point. The .higher stress regions are indicated in red and yellow
These regions are at the joint of the vane and the impeller hub, along the impeller face and approximately at 1/3
length along the vane tip. A possible cause of this high stress may be the frictional forces as well torsion effect of the
moment load from the motor.
This analysis is verified in dry run simulations where impeller vanes are known to break from the above two regions
only.
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