Affiliation:
1. University of Bath, Bath, UK
Abstract
Ingress of hot gas through the rim seals of gas turbines can be modelled theoretically using the so-called orifice equations. In Part 1 (ASME GT 2009-59121) of this two-part paper, the orifice equations were derived for compressible and incompressible swirling flow, and the incompressible equations were solved for axisymmetric rotationally-induced (RI) ingress. In Part 2, the incompressible equations are solved for non-axisymmetric externally-induced (EI) ingress and for combined EI and RI ingress. The solutions show how the nondimensional ingress and egress flow rates vary with Θ0, 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 ε, the sealing effectiveness, depends principally on Θ0; the theoretical variation of ε with Θ0 is similar to that found in Part 1 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 ε for EI ingress are in good agreement with available experimental data, but there are insufficient published data to validate the theory for combined ingress.
Cited by
9 articles.
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1. Buffer effect of turbine rim cavity on hot gas ingestion;Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy;2022-04-17
2. Numerical Study on Sealing Effectiveness Changes with Increased Turbine Rotor Rim Seal Thickness;Journal of the Korean Society of Propulsion Engineers;2022-02-28
3. Hot gas ingestion in chute rim seal clearance of gas turbine;International Journal of Turbo & Jet-Engines;2021-05-26
4. Hot gas ingestion in chute rim seal clearance of gas turbine;International Journal of Turbo & Jet-Engines;2021-05-26
5. Effect of rotor–stator rim cavity flow on the turbine;International Journal of Turbo & Jet-Engines;2021-05-20