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Physical aspects of CMAS particle dynamics and deposition in turboshaft engines

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Abstract

Gas turbine engines for fixed-wing or rotary-wing aircraft are operated in a variety of harsh weather environments ranging from arctic, volcanic zones, to desert conditions. Operation under these degraded conditions leads to the undesired entrainment of complex particulates resulting in drastic performance losses. Hence, there is a critical need to understand the governing mechanisms to inform the development of durable thermal and environmental barrier coatings. The objective of the current work is to present a novel multiscale physics-based approach to study two-phase flows that take into account the underpinning particle transport and deposition dynamics. Sessile droplet models are presented and used to compute the contact angle at high temperatures and compared with experiments. The study also investigates the sensitivity of deposition patterns to the Stokes number and the results identify local vulnerability regions. The analysis suggests that particle size distributions and the initial trajectories of the particles are critically important in predicting the final deposition pattern.

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Acknowledgments

This work was supported in part by resources from the DoD High-Performance Computing Modernization Program (HPCMP) FRONTIER Award to ARL with project title “Petascale High Fidelity Simulation of Atomization and Spray/Wall Interactions”. L.B., A.G., and M.M. were supported by the VTD 6.1 basic research mission program in propulsion sciences and a DoD Laboratory University Collaborative Initiative (LUCI) Fellowship. The simulations were run on the Centennial HPC System at the ARL DSRC. This work was conceptualized through ARL participation in the 2018 Center for Turbulence Research Summer Program at Stanford University.

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Authors and Affiliations

  1. US Army Research Laboratory, Aberdeen Proving Ground, Maryland, 21005, USA

    Luis G. Bravo, Muthuvel Murugan & Anindya Ghoshal

  2. Department of Aerospace Engineering, University of Maryland, College Park, Maryland, 20742, USA

    Nishan Jain & Alison Flatau

  3. Department of Aerospace Engineering, University of Cincinnati, Cincinnati, Ohio, 45221, USA

    Prashant Khare

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  1. Luis G. Bravo
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  2. Nishan Jain
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  4. Muthuvel Murugan
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  5. Anindya Ghoshal
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  6. Alison Flatau
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Correspondence to Luis G. Bravo.

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Bravo, L.G., Jain, N., Khare, P. et al. Physical aspects of CMAS particle dynamics and deposition in turboshaft engines. Journal of Materials Research 35, 2249–2259 (2020). https://doi.org/10.1557/jmr.2020.234

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