Abstract
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.
D'Sousa, Rohan Joseph (2000). A comparison of rotordynamic-coefficient predictions for annular honeycomb gas seals using different friction-factor models. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -2000 -THESIS -D34.