High speed 2-dimensional temperature measurements of nanothermite composites: Probing thermal vs. Gas generation effects

2018 ◽  
Vol 123 (11) ◽  
pp. 115902 ◽  
Author(s):  
Rohit J. Jacob ◽  
Dylan J. Kline ◽  
Michael R. Zachariah
Keyword(s):  
High Speed ◽  
Temperature Measurements ◽  
Gas Generation

scholarly journals Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Patrick Nau ◽  
Zhiyao Yin ◽  
Oliver Lammel ◽  
Wolfgang Meier
Keyword(s):  
Gas Turbine ◽  
Wall Temperature ◽  
Gas Turbines ◽  
High Speed ◽  
Bluff Body ◽  
Temperature Measurements ◽  
Transient Temperature ◽  
High Time Resolution ◽  
Ceramic Surface ◽  
Precessing Vortex Core

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.

scholarly journals Subpixel Temperature Measurements in Plasma Jet Environments Using High-Speed Multispectral Pyrometry

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
Tairan Fu ◽  
Jiangfan Liu ◽  
Minghao Duan ◽  
Sen Li
Keyword(s):  
Temperature Distribution ◽  
High Speed ◽  
Leading Edge ◽  
Plasma Jet ◽  
Temperature Measurements ◽  
Convective Heating ◽  
Small Data ◽  
Supersonic Plasma ◽  
Supersonic Plasma Jet ◽  
Spatial Temperature

A high-speed (2 kHz) near-infrared (1.0–1.65 μm) multispectral pyrometer was used for noninvasive measurements of the subpixel temperature distribution near the sharp leading edge of a wing exposed to a supersonic plasma jet. The multispectral pyrometer operating in the field measurement mode was able to measure the spatial temperature distribution. Multiple spectra were used to determine the temperature distributions in the measurement region. The spatial resolution of the multispectral pyrometer was not restricted to one “pixel” but was extended to subpixel accuracy (the temperature distribution inside one pixel in the image space corresponding to the point region in the object space). Thus, this system gives high-speed, multichannel, and long working time spatial temperature measurements with a small data stream from high-speed multispectral pyrometers. The temperature distribution of the leading edge of a ceramic wing was investigated with the leading edge exposed to extreme convective heating from a high-enthalpy plasma flow. Simultaneous measurements with a multispectral pyrometer and an imaging pyrometer verify the measurement accuracy of the subpixel temperature distribution. Thus, this multispectral pyrometry can provide in situ noninvasive temperature diagnostics in supersonic plasma jet environments.

High-speed temperature measurements using novel optical-fiber-based systems

2003 ◽  
Author(s):  
Frederic A. Bezombes ◽  
David R. Allanson ◽  
David R. Burton ◽  
Michael J. Lalor
Keyword(s):  
Optical Fiber ◽  
High Speed ◽  
Temperature Measurements

A high-speed system for strain and temperature measurements based on fiber Bragg sensors

2007 ◽  
Vol 50 (4) ◽  
pp. 565-571 ◽  
Author(s):  
W. Ecke ◽  
A. A. Chertoriiski ◽  
V. L. Vesnin
Keyword(s):  
High Speed ◽  
Temperature Measurements
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