Naslov
Generalized Correlations for Heat Transfer Determination in Turbine Labyrinth Glands

Autori
Guzović, Zvonimir ; Matijašević, Branimir ; Sviderek, Stanislav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 3rd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics - HEFAT 2004 / Meyer, Josua P. - Pretoria : HEFAT, 2004, 1-8

Skup
3rd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics - HEFAT 2004

Mjesto i datum
Cape Town, Južnoafrička Republika, 21.06.2004. - 24.06.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Generalized Correlations; Heat Transfer Determination; Turbine Labyrinth Glands

Sažetak
In solving different problems in designing of new and exploitation of the existing steam and gas turbines (e.g. the determining of the losses in turbine stage i.e. efficiency of energy conversion, efficiency of the cooling systems of cooled gas turbine stages, temperature fields i.e. state of thermal deformations and stresses of turbine elements with the aim of defining the required clearances, etc.) it is necessary to perform the calculation of heat transfer on the surfaces of single construction elements, among others, also in the labyrinth glands, which are used only for sealing in steam and gas turbines today. For this purpose the values of convective heat transfer coefficients have to be known. The latter are most frequently determined on the basis of correlations obtained by means of experimental measurements, often without checking the possibility of their application in individual cases. In literature, there is a definite number of empirical correlations proposed by various researchers, which are mutually distinguished with regard to the range of change of the flow and geometrical parameters and with regard to choosing physical properties. All this makes their application more difficult. Therefore, systematization of single empirical correlations from literature is performed first in the paper, and after that the original generalized correlations are proposed obtained by means of statistical analysis of calculation results by systematized single correlations. The original generalized correlations proposed in the paper ensure the accuracy of calculations which satisfy engineering applications.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA