The effect of the isolated leakage passage on the rotordynamic behavior of a shrouded impeller /
Previous researchers have determined experimentally that the
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: |
| Summary: | Previous researchers have determined experimentally that the contribution of the fluid-induced forces from- the leakage flow in shrouded-impeller pumps can be of the same order as the contribution from the non-uniform pressure acting on the impeller which, in itself, can be catastrophic. The present work was undertaken to investigate the contributions to the rotordynamic forces and coefficients from the isolated leakage passage of a shrouded pump impeller designed by Guinzberg et al. (1993). These rotordynamic forces and coefficients were detenrnined from the implementation of a numerical finite-element based perturbation code, with the input being primarily the centered-rotor "zeroth-order" flow solution. The primary focus of this research was to investigate the dependency of the forces (radial and tangential) in the absence of the inlet flow swirl and then with an inlet swirl velocity that is twice the impeller tip speed. The data demonstrated that the effect of swirl is to increase both the tangential and radial forces, thereby also increasing the range of whirl frequency ratios for which there is a potentially destabilizing force. The numerical results which include the addition of swirl to the inlet flow agreed surprisingly well with the magnitudes and trends of the experimental data. |
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| Item Description: | Vita. "Major subject: Mechanical Engineering". |
| Physical Description: | xi, 61 leaves : illustrations ; 28 cm. |
| Bibliography: | Includes bibliographical references. |