Projects per year
Abstract
The ingress of hot gas through the rim seal of a gas turbine depends on the pressure difference between the mainstream flow in the turbine annulus and that in the wheel-space radially inward of the rim seal. In this paper, a previously published orifice model is modified so that the sealing effectiveness εc determined from concentration measurements in a rig could be used to determine εp, the effectiveness determined from pressure measurements in an engine. It is assumed that there is a hypothetical “sweet spot” on the vane platform where the measured pressures would ensure that the calculated value of εp equals εc, the value determined from concentration measurements. Experimental measurements for a radial-clearance seal show that, as predicted, the hypothetical pressure difference at the sweet spot is linearly related to the pressure difference measured at an arbitrary location on the vane platform. There is good agreement between the values of εp determined using the theoretical model and values of εc determined from concentration measurements. Supporting computations, using a 3D steady computational fluid dynamics (CFD) code, show that the axial location of the sweet spot is very close to the upstream edge of the seal clearance. It is shown how parameters obtained from measurements of pressure and concentration in a rig could, in principle, be used to calculate the sealing effectiveness in an engine.
Original language | English |
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Article number | 032510 |
Pages (from-to) | 1-10 |
Number of pages | 10 |
Journal | Journal of Engineering for Gas Turbines and Power: Transactions of the ASME |
Volume | 137 |
Issue number | 3 |
Early online date | 7 Oct 2014 |
DOIs | |
Publication status | Published - 31 Mar 2015 |
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Dive into the research topics of 'Use of pressure measurements to determine effectiveness of turbine rim seals'. Together they form a unique fingerprint.Projects
- 2 Finished
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Experimental and Theoretical Modelling of Hot Gas Ingestion through Gas-Turbine Rim Seals
Lock, G. (PI), Robinson, K. (CoI), Sangan, C. (CoI) & Wilson, M. (CoI)
Engineering and Physical Sciences Research Council
12/02/13 → 10/08/16
Project: Research council
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Measurement and Modelling of Ingress
Lock, G. (PI), Owen, M. (CoI), Robinson, K. (CoI) & Wilson, M. (CoI)
Engineering and Physical Sciences Research Council
1/10/09 → 30/09/12
Project: Research council
Profiles
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James Scobie
- Department of Mechanical Engineering - Reader
- IAAPS: Propulsion and Mobility
- Centre for Sustainable Energy Systems (SES)
Person: Research & Teaching, Core staff, Affiliate staff