Project Title:

Turbomachinery Temperature Measurements Using an Oxygen-Laser-Induced Fluorescence

01.03-9500
911809
Turbomachinery Temperature Measurements Using an Oxygen-Laser-Induced Fluorescence
Aerodyne Research, Inc.
45 Manning Rd
Billerica
MA
01821
Kurt D.
Annen
508-663-9500
LeRC
NAS3-26600
007

01.03-9500
911809

Abstract:

Turbomachinery Temperature Measurements Using an Oxygen-Laser-Induced Fluorescence
Recent progress in designing advanced turbomachinery includes the use of numerical
models of compressors, turbines, and combustors to guide new designs. However, further
advancements in the accuracy of numerical models are needed. Improvements in these
models will depend significantly on the availability of quality experimental data
against which the models can be judged. Velocity data currently being acquired in
compressor and turbine test facilities needs to be accompanied by temperature measurement
to improve the utilization of the data by numerical modelers and to allow the determination
of the heat transfer coefficient and Stanton number from heat flux measurements.
This project will develop a diagnostic tool using 02 laser-induced fluorescent (LIF)
and 02 Raman scattering to perform linear-imaging gas temperature measurements in
turbomachinery. The ratio of the 02 LIF signal to the 02 Raman signal is a function
of temperature only, and is independent of the laser power and the cleanliness of
the optics. Seeding is not required. Single pulse measurements of the temperature
profile can be performed with good precision. Phase I will determine the optimum
laser excitation wavelengths for measurements in compressor and turbine test facilities.
The temperature sensitivity of the technique will be measured and compared with theoretical
predictions. A system for turbomachinery applications will be designed and the accuracy
and precision of the temperature measurement system will be calculated.
The turbine temperature measurement system will have commercial applications for
temperature and heat transfer coefficient measurements in turbomachinery test facilities
of jet engine and stationary power turbine manufactures.
turbomachinery, 02 LIF, 02 Raman, temperature diagnostic