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Some new results concerning the dynamic behavior of annular turbulent sealsThe dynamic characteristics of annular turbulent seals applied in high pressure turbopumps can be described by stiffness, damping, and inertia coefficients. An improved procedure is presented for determining these parameters by using measurements made with newly developed test equipment. The dynamic system seal, consisting of the fluid between the cylindrical surfaces of the rotating shaft and the housing, is excited by test forces (input), and the relative motion between the surfaces (output) is measured. Transformation of the input and output time signals into the frequency domain leads to frequency response functions. An analytical model, depending on the seal parameters, is fitted to the measured data in order to identify the dynamic coefficients. Some new results are reported that show the dependencies of these coefficients with respect to the axial and radial Reynolds numbers and the geometrical data of the seal.
Document ID
Document Type
Conference Paper
Massmann, H. (Kaiserslautern Univ.)
Nordmann, R. (Kaiserslautern Univ.)
Date Acquired
August 12, 2013
Publication Date
December 1, 1985
Publication Information
Publication: NASA. Lewis Research center Instability in Rotating Machinery
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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NameType 19860020702.pdf STI

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IDRelationTitle19860020688Analytic PrimaryInstability in Rotating Machinery