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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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Prediction of laminar – turbulent transition on highly-loaded turbomachinery profiles

Drobniak S, Elsner W

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2008

nr 133

95--102

The paper presents a review of the current knowledge concerning the modelling of laminar – turbulent transition on turbomachinery blading. The most important physical features of laminar – turbulent transition are reviewed and their consequences for CFD modelling are discussed. The main features and assumptions of existing models are discussed with special reference to intemittency based models. The limitations of existing models are discussed and the reasons why intermittency – based models seem to be a promising perspective are outlined. The main features of intermittency – based model developed at the Institute of Thermal Machinery and extended by in-house correlations on onset location and transition length are also presented and discussed.

3D shape optimisation of turbomachinery blading

Lampart P., Yershov S.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2002

Vol. 6, No 1

113-125

The shape of HP gas and steam turbine stages, as well as of an LP exit stage of a steam turbine, is optimised numerically using a code Optimus and 3D RANS solver FLowER. The numerical method draws on direct constrained optimisation based on the method of deformed polyhedron. Values of the minimised objective function, that is stage losses with the exit energy are found from 3D viscous compressible computations. There are constraints imposed on the mass flow rate, exit swirl angle and reactions. Among the optimised parameters are stator and rotor blade numbers, stagger and twist angles, stator sweep and lean, both straight and compound. The optimisation gives new 3D designs with increased efficiencies.