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

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Economic and technical analysis of cooling water control in large-power steam turbines

100%

Gardzielewicz A. , Głuch J. , Błaszczyk A.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2008

tom nr 133

139--148

The article presents the economic and technical analysis of the application of cooling water control in large-power steam turbines. The analysis was performed on selected designs of pumps used in 200 MW turbosets in operation in Polish power plants.

Numerical simulation of 3D flow in axial turbomachines

88%

Yershov S. , Rusanov A. V. , Gardzielewicz A. , Lampart P. , Świrdyczuk J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

1998

tom Vol. 2, No 2

319-347

The paper is intended to describe a method for the calculation of 3D viscous compressible (subsonic or supersonic) flow in axial turbomachines described in the form of thin-layer Reynolds-averaged Navier-Stokes equations. The method draws on Godunov-type upwind differencing and ENO reconstruction suggested by Harten (1987), so as to assure monotonicity preservation and high accuracy of computational results. The computational efficiency is achieved thanks to the implementation of a simplified H-type multi-grid approach and delta -form implicit step. Turbulent effects are simulated with the help of a modified algebraic model of Baldwin-Lomax (1978). This method was at the foundation of a computer code-a complex software package to calculate 3D flow in multi-stage turbomachines that allows us to obtain local characteristics, like temperature, pressure, density or velocity distributions, as well as global characteristics, such as flow rates, stage reaction, flow efficiency for the considered turbine/compressor stage. The paper also gives selected results of computation of a number of turbomachinery cascades, showing that these results agree reasonably well with the available experimental data.

3D multistage computations of turbine flows using different state equations

88%

Rusanov A. V. , Yershov S. , Lampart P. , Świrdyczuk J. , Gardzielewicz A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2002

tom Vol. 6, No 4

591-600

The paper describes the implementation of a modified state equation for perfect gas and Tammann equation into a 3D RANS solver FlowER. In the modification the specific heats are assumed as linear functions of temperature. A 5-stage LP steam turbine stage is calculated, and the comparison of results for constant and variable specific heats is illustrated. The modification significantly improves the correctness of determination of thermodynamic parameters in the entire flow region, especially in the exit stage.

Proposal of modernisation of a steam turbine stage before extraction, CFD and CSD analysis

75%

Gardzielewicz A. , Karcz M. , Marcinkowski S. , Bielecki M. , Badur J. , Malec A. , Banaszkiewicz M.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2002

tom Vol. 6, No 4

577-589

The paper presents an idea and analysis of application of a new solution of a stage before extraction in the modernised LP part of 200MW turbines with ND exhaust. The idea of the patent is to introduce to the turbine steam path a ring directing high energy tip leakage steam from the stage to the regenerative extraction. Owing to this it is possible to cheaply achieve some energy benefits from the operation of first heat exchanger which in the modernised 200MW turbine is continuously underheated. Ring design has been checked using CFD and CSD numerical codes.