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Unsteady Forces Acting on Blades and the Shaft in the Last Stage of Steam Turbine with Exhaust Hood

Rządkowski R., Soliński M., Kwapisz L., Gnesin V.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2005

nr 128, vol. 2

471-478

The aerodynamic unsteady forces acting on the rotor blades and the shaft in the last stage of turbine 13K215 were calculated. A numerical simulation of a 3D transonic ideal gas flow through turbomachinery blade rows moving relative to one another is presented, with a non-uniform pressure distribution of steam behind the rotor blades. In order to find the pressure distribution, numerical calculations were done for unsteady flow through the stage with the exhaust hood using the program FLUENT. The unsteady forces of the rotor blades were calculated. The natural frequencies of the bladed disc were compared with the frequencies of the flow excitations. Next, the unsteady forces acting on the shaft were calculated, taking the mistuning of the blades into consideration.

Exhaust Hood for the Steam Turbines of Single - Flow Arrangement

Tajc L., Bednar L., Poskocilova M., Hoznedl M.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2005

nr 128, vol. 2

547-556

The effect of the front wall inclination and the mutual position of casing and diffuser on thermodynamical losses have been investigated. The effect of the outer-casing shape variation was studied. In addition, the influence of taking-out for bearing cover on the loss factor has also been tasted. The computational model employed as the input a measured inlet velocity profile. Some internal rib and reinforcement were neglected in the model. A 3D model was used, but the symmetry of the flow field was taken into account. Only half of the flow channel was being treated in the computation. The results were compared with the available experimental data.

Uwagi do konstrukcji króćców wylotowych turbin parowych

Gardzilewicz A.

Archiwum Energetyki

2002

T. 31, nr 3/4

3-26

W pracy przedstawiono przegląd dotychczasowych rozwiązań konstrukcyjnych króćców wylotowych turbin parowych, który wykonano w oparciu o analizę przepływową. Tę analizę uzupełniono o własne pomiary i obliczenia numeryczne z wykorzystaniem techniki CFD, zastosowane dla konkretnych prac modernizacyjnych.

The paper presents an overview of the existing constructions of steam turbine exhaust hoods. The overview is based on the flow analysis complemented by results of own measurements and CFD calculations of selected turbine modernisation projects.