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MORI, M., SEKAVČNIK, M.
EMPIRICAL MODEL FOR CONVECTIVE HEAT TRANSFER IN ROTATING AXIAL CASCADE
KOMUNALNA ENERGETIKA / POWER ENGINERING, 13
This paper presents a method of combining numerical and experimental results and empirical model for convective heat transfer in rotating axial cascade. The method is a combination of infrared thermography and numerical simulations and is useful in rotating environments, which are highly problematic to implement any measurement. The method represents a considerable simplification of the acquisition of the distribution of Nusselt numbers at the observed surface and allows the study of convective heat transfer. The observed surface temperature is measured by infrared thermography. Experimentally obtained temperature distributions are evaluated by numerical obtained by using statistical method. To calculate the Nu number is further used numerically calculated heat flux and measured temperature distribution for the known geometry of the axial cascade. The results are presented as a 2D distribution of Nu numbers for different flow conditions (Re) and at different rotational speeds (Ro). The empirical model is derived, which gives the dependence of Nu number distribution from the influence of rotation (Ro) and flow conditions (Re).
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