Transient Heat Transfer Characteristics of Shrouded Rotating Disk with Variation of Rotating Speed

A gas turbine disk was simplified to be a shrouded rotating disk system with central cooling air inflow,the disk was heated at rim.Transient heat transfer characteristics of the disk were investigated experimentally as the rotating speed was varied.The disk diameter was 400 mm and its maximus rotating speed was up to 3000 r/min.The results show that the rate of temperature vs time at large radium is greater than that at small radius.Averaged Nusselt number enlarges with the increase of Rotational Reynolds number.There are no significant difference in averaged Nusselt number between the stepwise abrupt variation and linear variation in the rotating speed.