Rotating Heat Transfer Measurements on Realistic Multi-pass Geometry

Abstract

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.