Experimental Study of the Cooling Effectiveness of a Rotating Disc with a Central Cooling-air Feed

With regard to the cooling of turbine engine high-temperature components it is essential to meet the following main requirements: a minimal overall temperature of the hot components and a minimal temperature difference within the various parts of the hot components. In view of the foregoing one has to address the above-cited main requirements in addition to the study of convection heat transfer factor of the disc surface. In the present paper an engine turbine disc has been simplified to a rotating disc model with a central cooling-air feed. Under this simplification an experimental study is conducted of the effect of rotating Reynolds number, air inlet Reynolds Number, disc cowl clearance ratio and outlet air clearance ratio on the non-dimensional excessive body average temperature and non-dimensional radial temperature difference. In addition, a relevant criterion relation has also been given in the paper.