A method for performing high accuracy temperature measurements in low-pressure sooting flames using two-line atomic fluorescence

2011 ◽  
Vol 33 (1) ◽  
pp. 799-806 ◽  
Author(s):  
Iain S. Burns ◽  
Xavier Mercier ◽  
Maxime Wartel ◽  
Robin S.M. Chrystie ◽  
Johan Hult ◽  
...  
Keyword(s):  
Low Pressure ◽  
High Accuracy ◽  
Temperature Measurements ◽  
Atomic Fluorescence

Diode laser atomic fluorescence temperature measurements in low-pressure flames

2008 ◽  
Vol 93 (4) ◽  
pp. 907-914 ◽  
Author(s):  
I. S. Burns ◽  
N. Lamoureux ◽  
C. F. Kaminski ◽  
J. Hult ◽  
P. Desgroux
Keyword(s):  
Diode Laser ◽  
Low Pressure ◽  
Temperature Measurements ◽  
Atomic Fluorescence

Multi-Objective Modeling of Leading-Edge Serrations Applied to Low-Pressure Axial Fans

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
Till M. Biedermann ◽  
M. Reich ◽  
C. O. Paschereit
Keyword(s):  
Low Pressure ◽  
High Accuracy ◽  
Operating Conditions ◽  
Optimization Approach ◽  
Optimization Strategy ◽  
Latin Hypercube Design ◽  
Axial Fan ◽  
Multi Objective ◽  
Target Values ◽  
Leading Edges

Abstract A novel modeling strategy is proposed which allows high-accuracy predictions of aerodynamic and aeroacoustic target values for a low-pressure axial fan, equipped with serrated leading edges. Inspired by machine learning processes, the sampling of the experimental space is realized by use of a Latin hypercube design plus a factorial design, providing highly diverse information on the analyzed system. The effects of four influencing parameters (IP) are tested, characterizing the inflow conditions as well as the serration geometry. A total of 65 target values in the time and frequency domains are defined and can be approximated with high accuracy by individual artificial neural networks. Furthermore, the validation of the model against fully independent test points within the experimental space yields a remarkable fit, even for the spectral distribution in 1/3-octave bands, proving the ability of the model to generalize. A metaheuristic multi-objective optimization approach provides two-dimensional Pareto optimal solutions for selected pairs of target values. This is particularly important for reconciling opposing trends, such as the noise reduction capability and aerodynamic performance. The chosen optimization strategy also allows for a customized design of serrated leading edges, tailored to the specific operating conditions of the axial fan.

Temperature Measurement System for Low Pressure Ratio Turbine Testing

2003 ◽  
Author(s):  
R. Va´zquez ◽  
J. M. Sa´nchez
Keyword(s):  
Temperature Measurement ◽  
Measurement System ◽  
High Speed ◽  
New Technologies ◽  
Pressure Ratio ◽  
Low Pressure ◽  
High Accuracy ◽  
Single Stage ◽  
Measurement Systems ◽  
Temperature Measurement System

In 1999, ITP (Industria de Turbopropulsores, S.A.) launched a wide on-going research program focusing on new technologies to provide significant improvements in Low Pressure Turbines cost and weight. As consequence of the new technologies the experience limits are exceeded and new unknown concepts, like high stage loading turbines, must be explored and then a wide experimental work is required for validation purposes. Cold flow single stage rigs in high-speed facilities were selected by ITP as main vehicle to carry out the experimental validation. Single stage Low Pressure Turbine rigs have low-pressure ratio and power consumption, therefore efficiency predictions based on temperature drop require high accuracy thermocouple measurement systems (precision uncertainties lower than ±50 mK), if small efficiency variations must be captured. In this paper, a detailed uncertainty analysis is introduced and a temperature measurement system that allows achieving such high measurement accuracy is evaluated and described. Type T thermocouples are proposed for use in the range 0°C to 80°C, which are individually calibrated. The procedure followed for this calibration is presented and how is possible to achieve a precision of 30 mK. It is also shown as conventional UTR based on metal plates can behave as good as thermal baths in terms of temperature uniformity and errors, with the adequate isolation and temperature reference calibration. The conventional data recording and voltage measurement systems are experimentally evaluated, and they are found as main source of temperature errors. Although following some recommendations the precision of those systems can be improved, it is experimentally probed and therefore suggested the use of high accuracy voltmeter with a commutation unit to reduce significantly the temperature uncertainty. Finally a miniature Kiel Shroud is proposed and aerodynamically characterised in a high-speed facility. Mach, Reynolds number, yaw, blockage and manufacturing tolerance impact on recovery factor can be inferred from those results.

The use of carbon resistors for high accuracy temperature measurements

Cryogenics ◽  
1974 ◽  
Vol 14 (6) ◽  
pp. 340-341 ◽  
Author(s):  
V. Gröger ◽  
F. Stangler
Keyword(s):  
High Accuracy ◽  
Temperature Measurements

Carbon monoxide concentrations and temperature measurements in a low pressure CH_4–O_2–NH_3 flame

1988 ◽  
Vol 27 (2) ◽  
pp. 360 ◽  
Author(s):  
B. Rosier ◽  
P. Gicquel ◽  
D. Henry ◽  
A. Coppalle
Keyword(s):  
Carbon Monoxide ◽  
Low Pressure ◽  
Temperature Measurements
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