Publications by authors named "Andrew L Heyes"
Simultaneous point measurements of gas velocity and temperature were recently demonstrated using thermographic phosphors as tracer particles. There, continuous wave (CW) excitation was used and the spectral shift of the luminescence was detected with a two-colour intensity ratio method to determine the gas temperature. The conventional laser Doppler velocimetry (LDV) technique was employed for velocimetry.
View Article and Find Full Text PDFWe propose a point measurement technique for simultaneous gas temperature and velocity measurement based on thermographic phosphor particles dispersed in the fluid. The flow velocity is determined from the frequency of light scattered by BaMgAl10O17:Eu2+ phosphor particles traversing the fringes like in conventional laser Doppler velocimetry. Flow temperatures are derived using a two-color ratio method applied to the phosphorescence from the same particles.
View Article and Find Full Text PDFArticle Synopsis
- The paper introduces an innovative optical diagnostic method using seeded thermographic phosphor particles for simultaneous measurements of gas temperature, velocity, and mixture fraction in turbulent flows.
- The technique utilizes particle Mie scattering for velocity determination through a traditional PIV method, while phosphorescence emission helps measure temperature with a two-color approach, confirming that small tracer particle temperatures reflect gas temperatures.
- The experimental results demonstrate the method's effectiveness in measuring these parameters in a turbulent jet at up to 700 K, achieving high precision (2-5%) and accuracy (2%).