CNCS Center for Nonlinear and Complex Systems
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Publications [#281319] of Kenneth C. Hall

Papers Published

  1. Ekici, K; Hall, KC, Fast estimation of unsteady flows in turbomachinery at multiple interblade phase angles, Aiaa Journal, vol. 44 no. 9 (September, 2006), pp. 2136-2142, American Institute of Aeronautics and Astronautics (AIAA), ISSN 0001-1452 [1.23288], [doi]
    (last updated on 2020/07/13)

    A technique to estimate the unsteady flows in turbomachinery for many interblade phase angles was analyzed. The construction of the approximate solution technique starts with a pair of three-dimensional Euler (or Navier-Stokes) flow solvers. The accuracy of the approximate solutions for the interblade phase angles which are not members of the basic solutions depends on the number of snapshots used and the location of the snapshots. The minimum number of snapshots needed for accurate answers is not known a priori but an estimate of the error can be computed a posteriori. An estimate of the unsteady solution is computed at any interblade phase angles using the fast approximate solution technique. The main computational cost of the method is the determination of a handful of snapshot solutions and once these solutions are obtained the rest of the unsteady solutions can be predicted with very little additional computational cost.

    aerodynamics;blades;computational fluid dynamics;damping;flow instability;rotors;turbomachinery;