Wilbur ShapiroMechanical Technology, Inc., Latham, New York

Numerical, Analytical, Experimental Studyof Fluid Dynamic Forces in SealsVolume 2—Description of Gas Seal Codes GCYLT and GFACE

NASA/CR—2004-213199/VOL2

October 2004

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Wilbur ShapiroMechanical Technology, Inc., Latham, New York

Numerical, Analytical, Experimental Studyof Fluid Dynamic Forces in SealsVolume 2—Description of Gas Seal Codes GCYLT and GFACE

NASA/CR—2004-213199/VOL2

October 2004

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134

Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in SealsVolume 2—Description of Gas Seal Codes GCYLT and GFACE

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 code 2200,216–977–7439. Responsible person, Robert C. Hendricks, Research and Technology Directorate, NASA GlennResearch 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. Animplicit multidomain capability allow the division of complex flow domains to allow optimum use of computationalcells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients forrotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed forexpeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through aKnowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes arePC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance existsbetween the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearancefilms, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development offuture air-breathing and space propulsion engines.