HEAT TRANSFER FROM SHROUDED ROTATING DISK WITH CENTRIC AIR INFLOW

Abstract An air cooled turbine disk was investigated as the model of a rotating disk near a shrouded stator with centric inflow of cooling air.The heat transfer performance of the rotating disk was experimentally studied in consideration of rotational Reynolds number Re、mass flow coefficient C w、gap ratio G and shrouded clearance ratio G s.The disk diameter is 360mm and its maximal rotational speed is 3600rpm.The disk was electrically heated at the outer radial side.One of the disk surfaces was cooled by air and the another surface was adiabatic.Temperature of heated side and cooled surface was measured.Mean Nusselt number of cooled surface has been obtained by using numerical method.For large Reynolds number,the mean Nusselt number is slightly affected by the Reynolds number.Increasing mass flow coefficient can enhance the capacity of heat transfer.The effects of G and G s are small.An emperical correlation of the heat transfer coefficient of rotating disk is proposed.