An Extended Three-Control-Volume Theory for Circumferentially-Grooved Liquid Seals
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Circumferentially-grooved seals are used in centrifugal pumps to reduce leakage flow. They can also have a significant impact on pump rotordynamic characteristics. Florjancic (1990) developed an analysis for leakage and rotordynamic coefficients, using a partition of the seal into three control volumes. This paper presents a new theory, based on an extension of Florjancic's work (1990) for circumferentiallygrooved liquid seals. The current theory differs from Florjancic's analysis in the retention of transfer momentum terms and the introduction of diverging fiow in the through-flow section within a seal groove. Validation of the new analysis is achieved through a comparison with existing experimental data taken from Kilgore (1988), and Florjancic (1990). Theoretical results are reasonable and consistent; i.e., a modification in the seal parameters induces a correct evolution of the rotordynamic coefficients. Direct and cross-coupled stiffness coefficients are slightly underpredicted, whereas the direct damping coefficient is underpredicted within 40 percent. Leakage flow predictions are very good. © 1996 by ASME.
author list (cited authors)
Marquette, O. R., & Childs, D. W.