Deposition experiments are performed on a Hastelloy-X coupon using Arizona Road Test Dust (ARD). A statistical empirical model of the initial onset of ARD deposits is developed from the experimental data. The initial onset of deposits are a quadratic function of local surface temperature and impact velocity components (normal and tangential). A prominent observation is that tangential impact velocity has a significant non-linear, independent effect on deposits relative to normal impact velocity and local surface temperatures. All experiments use 20–40 μm ARD on a bare metal surface over a 1000–1100°C range. Unlike prior mass-based deposit studies, initial deposits for this study are quantified using a Coverage Ratio (CR), which is the area covered by deposits relative to the total area available. The empirical CR model has a strong correlation to coupon surface temperature and impact velocity vectors and is a foundation for future numerical or experimental model comparisons.
Experimental Based Empirical Model of the Initial Onset of Sand Deposits on Hastelloy-X From 1000°C to 1100°C Using Particle Tracking
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Boulanger, A, Hutchinson, J, Ng, WF, Ekkad, SV, Keefe, MJ, Xu, W, Barker, BJ, & Hsu, K. "Experimental Based Empirical Model of the Initial Onset of Sand Deposits on Hastelloy-X From 1000°C to 1100°C Using Particle Tracking." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 2D: Turbomachinery. Charlotte, North Carolina, USA. June 26–30, 2017. V02DT48A015. ASME. https://doi.org/10.1115/GT2017-64480
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