Session: 14-04 Systems

Paper Number: 81791

81791 - Effect of Jet-to-Plate Temperature Ratio on Flow and Heat Transfer Features of Active Clearance Control Systems 

The goal of the present work is to investigate the effect of target plate temperature on heat transfer features of representative active clearance control (ACC) geometries presenting 0.8 mm circular impingement holes arranged in a single row. The jets generated by such holes cool a flat target surface, which is replicated by a metal plate in the experimental setup. A steady state technique with controlled wall heat flux is used to measure averaged heat transfer values along the target plate. The target plate is composed by a series of insulated blocks to limit lateral conduction effects and also to assure a fine control of the supplied power. A full characterization of pipe, target plate and flow temperature are acquired using thermocouples and IR camera. Target plate temperature level ranges from 330 K to 580K while the manifold inlet temperature is kept at ambient level. The jet-to-target plate temperature ratio (TR) ranges from 1 to 2 circa. The investigated jet Reynolds numbers range from 4000 to 10000. The obtained results reveal that heat transfer features are affected by the target plate temperature level as it plays a role on the interaction between the spent flow, the jets coming out from the impingement nozzles and the feeding manifold surfaces. An in-depth analysis of the obtained results provides information about the extrapolation of rig results to engine conditions. 

Presenting Author: Riccardo Da Soghe Ergon Research

Presenting Author Biography: Riccardo is..

Authors:

Riccardo Da Soghe Ergon Research
Lorenzo Mazzei Ergon Research
Lorenzo Tarchi Ergon Research
Niccolo Casini Ergon Research
Lorenzo Cocchi University of Florence
Alessio Picchi University of Florence
Bruno Facchini University of Florence
Niccolò Castelli University of Florence
Maxime Rotenberg Safran Aircraft Engines