NDLI: Experimental Measurements of Ingestion Through Turbine Rim Seals: Part 2

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Carl, M. Sangan Zhou, Kunyuan Owen, J. Michael Oliver, J. Pountney Wilson, Mike Gary, D. Lock
Copyright Year	2011
Abstract	Part 1 of this two-part paper presented experimental results for externally-induced (EI) ingress, where the ingestion of hot gas through the rim seal into the wheel-space of a gas turbine is controlled by the circumferential variation of pressure in the external annulus. In Part 2, experimental results are presented for rotationally-induced (RI) ingress, where the ingestion is controlled by the pressure generated by the rotating fluid in the wheel-space. Although EI ingress is the common form of ingestion through turbine rim seals, RI ingress or combined ingress (where EI and RI ingress are both significant) is particularly important for double seals, where the pressure asymmetries are attenuated in the annular space between the inner and outer seals. In this paper, the sealing effectiveness was determined from concentration measurements, and the variation of effectiveness with sealing flow rate was compared with theoretical curves for RI ingress obtained from an orifice model. Using a nondimensional sealing parameter, Φ0, the data could be collapsed onto a single curve, and the theoretical variation of effectiveness with Φ0 was in very good agreement with the data for a wide range of flow rates and rotational speeds. It was shown that the sealing flow required to prevent RI ingress was much less than that needed for EI ingress, and it was also shown that the effectiveness of a radial-clearance seal is significantly better than that for an axial-clearance seal for both EI and RI ingress.
Sponsorship	International Gas Turbine Institute
Starting Page	755
Ending Page	765
Page Count	11
File Format	PDF
ISBN	9780791854655
DOI	10.1115/GT2011-45313
Volume Number	Volume 5: Heat Transfer, Parts A and B
Conference Proceedings	ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2011-06-06
Publisher Place	Vancouver, British Columbia, Canada
Access Restriction	Subscribed
Subject Keyword	Fluids Gas turbines Wheels Sealing (process) Clearances (engineering) Annulus Flow (dynamics) Pressure Turbines
Content Type	Text
Resource Type	Article

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Prediction of Ingestion Through Turbine Rim Seals—Part I: Rotationally Induced Ingress

Prediction of Ingestion Through Turbine Rim Seals—Part 1: Rotationally-Induced Ingress

Prediction of Ingestion Through Turbine Rim Seals—Part 2: Externally-Induced and Combined Ingress

Experimental Measurements of Ingestion Through Turbine Rim Seals—Part III: Single and Double Seals

Experimental Measurements of Ingestion Through Turbine Rim Seals: Part 1—Externally-Induced Ingress

Prediction of Ingress Through Turbine Rim Seals—Part I: Externally Induced Ingress

Experimental Measurements of Ingestion Through Turbine Rim Seals: Part 3—Single and Double Seals

Prediction of Ingress Through Turbine Rim Seals: Part 1—Externally-Induced Ingress

Prediction of Ingress Through Turbine Rim Seals—Part II: Combined Ingress

Experimental Measurements of Ingestion Through Turbine Rim Seals: Part 2—Rotationally-Induced Ingress

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