Analysis of experimental shaft seal data for high-performance turbomachines - As for Space Shuttle main enginesHigh-pressure, high-temperature seal flow (leakage) data for nonrotating and rotating Raleigh-step and convergent-tapered-bore seals were characterized in terms of a normalized flow coefficient. The data for normalized Rayleigh-step and nonrotating tapered-bore seals were in reasonable agreement with theory, but data for the rotating tapered-bore seals were not. The tapered-bore-seal operational clearances estimated from the flow data were significantly larger than calculated. Although clearances are influenced by wear from conical to cylindrical geometry and errors in clearance corrections, the problem was isolated to the shaft temperature - rotational speed clearance correction. The geometric changes support the use of some conical convergence in any seal. Under these conditions rotation reduced the normalized flow coefficiently by nearly 10 percent.
Document ID
19870058572
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hendricks, R. C. (NASA Lewis Research Center Cleveland, OH, United States)
Mullen, R. L. (Case Western Reserve University Cleveland, OH, United States)
Braun, M. J. (Akron, University OH, United States)
Burcham, R. E. (NASA Lewis Research Center Cleveland, OH, United States)
Diamond, W. A. (Rockwell International Corp. Rocketdyne Div., Canoga Park, CA, United States)