Ingress of hot gas through the rim seals of gas turbines can be modeled theoretically using the so-called orifice equations. In Part I of this two-part paper, the orifice equations were derived for compressible and incompressible swirling flows, and the incompressible equations were solved for axisymmetric rotationally induced (RI) ingress. In Part II, the incompressible equations are solved for nonaxisymmetric externally induced (EI) ingress and for combined EI and RI ingress. The solutions show how the nondimensional ingress and egress flow rates vary with , the ratio of the flow rate of sealing air to the flow rate necessary to prevent ingress. For EI ingress, a “saw-tooth model” is used for the circumferential variation of pressure in the external annulus, and it is shown that , the sealing effectiveness, depends principally on ; the theoretical variation of with is similar to that found in Part I for RI ingress. For combined ingress, the solution of the orifice equations shows the transition from RI to EI ingress as the amplitude of the circumferential variation of pressure increases. The predicted values of for EI ingress are in good agreement with the available experimental data, but there are insufficient published data to validate the theory for combined ingress.
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July 2011
Research Papers
Prediction of Ingestion Through Turbine Rim Seals—Part II: Externally Induced and Combined Ingress
J. Michael Owen
J. Michael Owen
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UK
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J. Michael Owen
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UKJ. Turbomach. Jul 2011, 133(3): 031006 (9 pages)
Published Online: November 12, 2010
Article history
Received:
July 23, 2009
Revised:
August 10, 2009
Online:
November 12, 2010
Published:
November 12, 2010
Connected Content
A companion article has been published:
Prediction of Ingestion Through Turbine Rim Seals—Part I: Rotationally Induced Ingress
Citation
Owen, J. M. (November 12, 2010). "Prediction of Ingestion Through Turbine Rim Seals—Part II: Externally Induced and Combined Ingress." ASME. J. Turbomach. July 2011; 133(3): 031006. https://doi.org/10.1115/1.4001178
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