Jed Walowit and Wilbur ShapiroMechanical Technology, Inc., Latham, New York

Numerical, Analytical, Experimental Studyof Fluid Dynamic Forces in SealsVolume 3—Description of Spiral-Groove Codes SPIRALGand SPIRALI

NASA/CR—2004-213199/VOL3

October 2004

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Jed Walowit and Wilbur ShapiroMechanical Technology, Inc., Latham, New York

Numerical, Analytical, Experimental Studyof Fluid Dynamic Forces in SealsVolume 3—Description of Spiral-Groove Codes SPIRALGand SPIRALI

NASA/CR—2004-213199/VOL3

October 2004

National Aeronautics andSpace Administration

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109

Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in SealsVolume 3—Description of Spiral-Groove Codes SPIRALG and SPIRALI

Jed Walowit and Wilbur Shapiro

CFD seal code; Industrial seal codes; User-friendly seal codes; Fluid-film seal codes;Clearance seal codes; Seals; Dynamics; Design; Computational analysis; Fluid forces

Unclassified -UnlimitedSubject Categories: 07, 20, and 34 Distribution: Nonstandard

Mechanical Technology, Inc. (MTI)968 Albany-Shaker RoadLatham, New York 12110

Project Manager, Anita D. Liang, Aeronautics Directorate, NASA Glenn Research Center, organization code2200, 216–977–7439. Responsible person, Robert C. Hendricks, Research and Technology Directorate, NASAGlenn Research Center, organization code 5000, 216–977–7507.

The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codesfor analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL iscapable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicitmultidomain capability allow the division of complex flow domains to allow optimum use of computational cells.SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamiccomputations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious paramet-ric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-BasedSystem (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using anOS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating andstationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumpingdevices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and spacepropulsion engines.