Rotating heat transfer measurements on realistic multi-pass geometry

In this contribution, a novel rig was used to assess the heat transfer coefficients on a full internal multi pass cooling scheme. Transient liquid crystal technique was used for the measurement of the heat transfer coefficient (HTC) on channel’s internal surfaces. A first set of experiments were performed at engine similar conditions of Re=21000 and Ro=0.074. In order to assess the reliability of the measurement methodology and to explore the thermal behavior at higher rotation numbers, tests were also carried out at Re=17000 and Ro=0.074-0.11. From the spatially resolved HTC maps made available, it is possible to characterize the thermal performances of the whole passage and to highlight the effect of rotation.