Hot Streaks and Phantom Cooling in a Turbine Rotor Passage: Part 2 — Combined Effects and Analytical Modelling

Richard J. Rdback, Robert P. Dring
1992 Volume 1: Turbomachinery   unpublished
This paper presents experimental documentation and analytical correlations demonstrating the effects of hot streak accumulation and phantom cooling on turbine rotor airfoil surface temperature. In particular, results are shown which quantifif the impact of ( ) a non-uniform temperature profile at the entrance of a turbine due to combusfiff-generated hot and cold streaks, and (2) cooling air discharged from the trailing edge of the upstream stator. In Part I of this paper, experimental results
more » ... e shown for a range of controlling variables to identify where streak accumulation and phantom cooling were most likely to be strongest. These variables include streak-to-free stream density ratio. streak injection location and coolant-to-bee stream density and velocity ratios. In Part 2 of this paper. experimental results are shown for the combined effects of hot streak and stator coolant on the adiabatic recovery temperature on the rotor. An analytical model is also developed to correlate the experimental results documented in Parts I and 2 of the paper.
doi:10.1115/92-gt-076 fatcat:jgqhjezmzffsrn47ue7ntbn2pa