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1 TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
1 Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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Vortex interactions in an hp turbine rotor and their effect on stage performan

Swirydczuk J

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2008

nr 133

335--342

The paper presents a CFD analysis of the process of development and mutual interactions of vortex structures in an HP turbine rotor and its effect on stage performance. Two stages selected for examination revealed different efficiency levels and loss distribution patterns. In the low-efficiency stage the analysis, performed in a steady-state mode on a fine-resolution grid, made it possible to trace the interaction of a horseshoe vortex with the separation structures forming in the rear part of the rotor passage, and evaluate the resultant fluctuations of stage performance parameters.

CFD modelling of turbine stage stator/rotor interaction

Świdyrczuk J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2006

Vol. 10, No 2

113-124

Issues related to numerical analyses of turbine stage stator/rotor interactions are disceussed, with special focus on the selection of grid parameters to secure proper modelling of the stator wake's dissipation. Unsteady calculations of the flow through a high-pressure turbine stage, based on 3D ORANS equations, are employed in the grid resolution analysis. Their results are compared with those obtained with other methods, both developed by the author or available in the literature. As a result, the 3D grid resolution of the order of 2000000 cells per one stator and/or one rotor passage has been determined as the necessary minimum for properly modelling the dissipation of the stator's wake on its war through the rotor's cascade, under the circumstances determined by the used CFD code. A generalization of this result is proposed.