Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: blading

Sortuj według:

Ogranicz wyniki do:

The Flow Path of 7CK65 Steam Turbine for a Combined Cycle Power Plant

Łuniewicz B., Obrzut D., Szyrejko C., Kietliński K., Gardzilewicz A.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2005

nr 128, vol. 2

345-356

Description of a modern design of 65 MW impulse steam turbine is presented in the paper. The construction of the turbine makes use of own highly-loaded profiles, which allow reducing the total number of stages and locating the entire flow system in one casing. The a/m turbine has been designed and manufactured at the ALSTOM Power Elbląg Design Office and applied in practice to the combined cycle unit at Zielona Góra Heat and Power Station (H&PS). The performed heat measurements confirmed the guaranteed high performance.

Determination of the field of constrain forces representing the effect of the impeller's blading

Czibere T., Kalmár L.

Computer Assisted Mechanics and Engineering Sciences

1999

Vol. 6, No. 3-4

321-327

The aim of this paper is to present a numerical method to determine a field of constrain forces which hydrodynamically represents the effect to the blading of the impeller of a radial-flow pump. The field of constrain forces are perpendicular to the stream surfaces of the relative velocity field and congruent to the blade surface of the impeller. The calculation of the constrain force field is based on the solution of the inverse problem of the hydrodynamic cascade theory. In the determination of the constrain force it is supposed that the frictionless and incompressible fluid flow is completely attached to the blade surfaces. The constrain force field can be calculated by the change of the moment of momentum in the absolute inviscid fluid flow which depends on the state of the pump. Knowing the constrain force field it is possible to calculate the distributions of the relative velocity, pressure and energy loss on the mean stream surface (F) of the impeller by solving the governing equations of the viscous relative flow. By calculating the energy loss belonging to different volume rates an approximate real head-discharge characteristic of the impeller also can be computed.

Protective coatings for high temperature applications.

Singheiser L., Quadakkers W.J., Clemens D., Steinbrech R.W.

Inżynieria Materiałowa

1998

R. XIX, nr 4

955-962

The improvement of efficiencies of land based gas turbines requires a significant increase of gas inlet temperature. This results in an increased service temperature of the blading materials and consequently to an enhanced oxidation attack of the blade coatings, which are usually of the NiCoCrAlY type. These coatings can act as protection against oxidation/corrosion and as bond coats for zirconia based thermal barrier systems. In both applications slow growth rates and optimum adherence of the alumina scales forming on the NiCoCrAlY coating during high temperature service are of crucial importance for component life. The mentioned technologically relevant properties of the alumina scales not only strongly depend on the coatings base composition but also on the presence of minor and trace elements. In the present paper this will be illustrated by showing as examples the effect of minor changes in yttrium and titanium content on MCrAlY oxidation properties. The coatings were tested by cyclic oxidation in the temperature range 950 degrees centigrade - 1100 degrees centigrade. The effect of the composition variation was studied by characterisation of the bulk coating and the corrosion products using light and electron optical microscopy as well as dilatometry.