Optical Fouling of the RB199 Pyrometer
2003; American Institute of Aeronautics and Astronautics; Volume: 19; Issue: 1 Linguagem: Inglês
10.2514/2.6081
ISSN1533-3876
Autores Tópico(s)Gas Dynamics and Kinetic Theory
ResumoThe Turbo-Union RB199 aeroengine, which powers the Panavia Tornado aircraft, has two pyrometers installed to measure and control turbine blade temperature. The utilization of pyrometry and its installation, together with system cone guration, for this in-e ight application are described. The most important issue with pyrometry for in-service use is the deposition of particulates, or optical fouling, of the system’ s lens. The e owe eld and particle trajectories in the RB199 pyrometer purge air design are investigated together with an analysis of the deposits that constitute the fouling of the pyrometer lens. It will be shown that the predominant e ow feature within the purging system is a swirl pattern that develops at the mouth of the still tube. This feature has the ability to draw contaminant particles into the still tube and, thus, signie cantly increase the likelihood of particle deposition onto the lens resulting in optical fouling of the instrument’ s optics.
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