A comparison of rotordynamic-coefficient predictions for annular honeycomb gas seals using different friction-factor models /
Predictions of rotordynamic-coefficients for annular honeycomb gas seals are compared using different friction-factor models. Analysis shows that the fundamental improvement in predicting the rotordynamic-coefficients accurately is the two-control-volume model of governing equations, Ha and Childs (...
| Main Author: | |
|---|---|
| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2000.
|
| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | Predictions of rotordynamic-coefficients for annular honeycomb gas seals are compared using different friction-factor models. Analysis shows that the fundamental improvement in predicting the rotordynamic-coefficients accurately is the two-control-volume model of governing equations, Ha and Childs (1994) and frequency dependent transfer function, Kleynhans and Childs (1997). The friction-factor model is important in predicting the rotordynamic-coefficients, specifically at a lower frequency range (3,000rpm to 10,000rpm) where industrial compressors and turbines tend to become unstable. At a higher frequency range irrespective of the friction-factor model, the magnitudes and trends of rotordynamic-coefficient predictions tend to coincide and improve the correlation with the measured rotordynamic-coefficients. |
|---|---|
| Item Description: | "Major subject: Mechanical Engineering". Vita. |
| Physical Description: | xi, 52 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references (leaves 39-40). |