Particle-Vane Interaction Probability in Gas Turbine Engines

Nicholas Bojdo, Matthew Ellis, Antonino Filippone, Merren Jones, Alison Pawley

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Engine durability tests are used by manufacturers to demonstrate engine life and minimum performance when subjected to doses of test dusts, often Arizona Road Dust. Grain size distributions are chosen to replicate what enters the engine; less attention is paid to other properties such as composition and shape. We demonstrate here the differences in the probability of interaction of a particle of a given particle Reynolds number on to a vane if particle shape, vane geometry, and flow Reynolds number are varied, and discuss why the traditional definition of Stokes number is inadequate for predicting the likelihood of interaction in these flows. We develop a new generalised Stokes number for nozzle guide vanes and demonstrate its use through application to 2D sections of the General Electric E3 nozzle guide vane. The new Stokes number is used to develop a reduced order probability curve to predict the interaction efficiency of spherical and non-spherical particles, independent of flow conditions and vane geometry. We show that assuming spherical particles instead of more realistic sphericity of 0:75 can lead to as much as 25% difference in the probability of interaction at Stokes numbers of around unity. Finally, we use a hypothetical size distribution to demonstrate the application of the model to predict the total mass fraction of dust interaction with a nozzle guide vane at design point conditions, and highlight the potential difference in accumulation factor between spherical and non-spherical particles.
    Original languageEnglish
    JournalJournal of Turbomachinery
    Early online date18 Jun 2019
    DOIs
    Publication statusPublished - 2019

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