Theoretical model to determine effect of ingress on turbine discs

L. Isobel Mear, J. Michael Owen, Gary D. Lock

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Sealing air is used in gas turbines to reduce the amount of hot gas that is ingested through the rim seals into the wheelspace between the turbine disc and its adjacent stationary casing. The sealing air attaches itself to the rotor, creating a buffering effect that reduces the amount of ingested fluid that can reach the surface of the rotor. In this paper, a theoretical model is developed, and this shows that the maximum buffering effect occurs at a critical flow rate of sealing air, the value of which depends on the seal geometry. The model, which requires two empirical constants, is validated using experimental data, obtained from infra-red (IR) temperature measurements, which are presented in a separate paper. There is good agreement between the adiabatic effectiveness of the rotor estimated from the model and that obtained from the IR measurements. Of particular interest to designers is that significant ingress can enter the wheel-space before its effect is sensed by the rotor.

Original languageEnglish
Title of host publicationASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Subtitle of host publicationHeat Transfer, Volume 5C
PublisherAmerican Society of Mechanical Engineers (ASME)
PagesV05CT15A005
ISBN (Print)9780791856734
DOIs
Publication statusPublished - 2015
EventASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015 - Montreal, Canada
Duration: 15 Jun 201519 Jun 2015

Conference

ConferenceASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015
CountryCanada
CityMontreal
Period15/06/1519/06/15

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    Mear, L. I., Owen, J. M., & Lock, G. D. (2015). Theoretical model to determine effect of ingress on turbine discs. In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition: Heat Transfer, Volume 5C (pp. V05CT15A005). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2015-42326