AI Article 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%).
Article Abstract
This paper presents an optical diagnostic technique based on seeded thermographic phosphor particles, which allows the simultaneous two-dimensional measurement of gas temperature, velocity and mixture fraction in turbulent flows. The particle Mie scattering signal is recorded to determine the velocity using a conventional PIV approach and the phosphorescence emission is detected to determine the tracer temperature using a two-color method. Theoretical models presented in this work show that the temperature of small tracer particles matches the gas temperature. In addition, by seeding phosphorescent particles to one stream and non-luminescent particles to the other stream, the mixture fraction can also be determined using the phosphorescence emission intensity after conditioning for temperature. The experimental technique is described in detail and a suitable phosphor is identified based on spectroscopic investigations. The joint diagnostics are demonstrated by simultaneously measuring temperature, velocity and mixture fraction in a turbulent jet heated up to 700 K. Correlated single shots are presented with a precision of 2 to 5% and an accuracy of 2%.
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| http://dx.doi.org/10.1364/OE.20.022118 | DOI Listing |
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