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 seal. This paper describes experimental measurements which quantify the effect of ingress on both the stator and rotor disks in a wheel-space pressurized by sealing flow. Infrared (IR) sensors were developed and calibrated to accurately measure the temperature history of the rotating disk surface during a transient experiment, leading to an adiabatic effectiveness. The performance of four generic (though engine-representative) single-and double-clearance seals was assessed in terms of the variation of adiabatic effectiveness with sealing flow rate. The measurements identify a so-called thermal buffering effect, where the boundary layer on the rotor protects the disk from the effects of ingress. It was shown that the effectiveness on the rotor was significantly higher than the equivalent stator effectiveness for all rim seals tested. Although the ingress through the rim seal is a consequence of an unsteady, three-dimensional flow field, and the cause-effect relationship between pressure and the sealing effectiveness is complex, the time-averaged experimental data are shown to be successfully predicted by relatively simple semi-empirical models, which are described in a separate paper. Of particular interest to the designer, significant ingress can enter the wheel-space before its effect is sensed by the rotor.
Original language | English |
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Article number | 042502 |
Journal | Journal of Engineering for Gas Turbines and Power: Transactions of the ASME |
Volume | 138 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Apr 2016 |
Bibliographical note
Paper No: GTP-15-1293Fingerprint
Dive into the research topics of 'Effect of ingress on turbine disks'. Together they form a unique fingerprint.Projects
- 2 Finished
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Experimental Measurements of the Effect of Hot Gas Ingestion on Rotor Discs
Sangan, C. (PI)
Engineering and Physical Sciences Research Council
2/01/14 → 1/01/16
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
Datasets
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Datasets for GTRUs EPSRC programmes, funded in collaboration with Siemens
Sangan, C. (Creator), Lock, G. (Creator), Wilson, M. (Creator), Scobie, J. (Creator) & Owen, J. (Creator), University of Bath, 2015
DOI: 10.15125/BATH-00116
Dataset