Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

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.

Numerical Simulation of a High Momentum Jet Flame at Elevated Pressure: A quantitative Validation with Detailed Experimental Data

“…One operating point which is investigated experimentally by , Severin et al (2017), Ax et al (2019) and Nau et al (2018) is chosen from the experimental data. It represents the case with the most comprehensive data set.…”

“…The model combustor investigated is based on a FLOX® burner and operates at gas turbine relevant conditions. The combustion chamber is optically accessible and well characterized by experiments conducted at the high pressure test rig HBK-S at the Institute of Combustion Technology at the German Aerospace Center (DLR) Severin et al, 2017;Nau et al, 2018;Ax et al, 2019;Schäfer et al, 2019).…”

“…As the accurate computation of the combustion chamber inner wall temperature is the main focus of the study , computational results are compared to thermographic phosphor measurements obtained by Nau et al (2018). By comparing the simulations conducted the influence of the combustion chamber wall temperature on the combustion process is also investigated.…”

Numerical Investigation of a High Momentum Jet Flame at Elevated Pressure: A Quantitative Validation with Detailed Experimental Data

“…One operating point which is investigated experimentally by , Severin et al (2017), Ax et al (2020) and Nau et al (2018) is chosen from the experimental data. It represents the case with the most comprehensive data set.…”

“…The model combustor investigated is based on a FLOX® burner and operates at gas turbine relevant conditions. The combustion chamber is optically accessible and well characterized by experiments conducted at the high pressure test rig HBK-S at the Institute of Combustion Technology at the German Aerospace Center (DLR) Severin et al, 2017;Nau et al, 2018;Schäfer et al, 2019;Ax et al, 2020).…”