Abstract
Phosphor thermometry has been developed for wall temperature measurements in gas turbines and gas turbine model combustors. An array of phosphors has been examined in detail for spatially and temporally resolved surface temperature measurements. Two examples are provided, one at high pressure (8 bar) and high temperature and one at atmospheric pressure with high time resolution. To study the feasibility of this technique for full-scale gas turbine applications, a high momentum confined jet combustor at 8 bar was used. Successful measurements up to 1700 K on a ceramic surface are shown with good accuracy. In the same combustor, temperatures on the combustor quartz walls were measured, which can be used as boundary conditions for numerical simulations. An atmospheric swirl-stabilized flame was used to study transient temperature changes on the bluff body. For this purpose, a high-speed setup (1 kHz) was used to measure the wall temperatures at an operating condition where the flame switches between being attached (M-flame) and being lifted (V-flame) (bistable). The influence of a precessing vortex core (PVC) present during M-flame periods is identified on the bluff body tip, but not at positions further inside the nozzle.
Highlights
The wall temperatures of gas turbine combustors play an important role in the performance of gas turbines
High-speed measurements at atmospheric pressure Wall temperature measurements using a high-speed laser and camera setup were performed in an atmospheric swirl flame
The transition from an attached V-flame to a lifted M-flame occurs after a local extinction near the flame root and formation of a precessing vortex core (PVC), while the PVC is suppressed when the flame transitions back to the V-flame [36]
Summary
The wall temperatures of gas turbine combustors play an important role in the performance of gas turbines. To the decay rate method, the intensity ratio of two emission lines can be used for some phosphors to determine the temperature [12]. It is possible to mix different phosphors to extend the temperature range that can be measured with a single coating. A polynomial is fitted to this curve to allow convenient calculation of the temperature from the measured decay rate in the experiment.
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