Effect of Jet-to-Jet Distance and Pipe Position on Flow and Heat Transfer Features of Active Clearance Control Systems
| Autor: | Laurent Descamps, Alessio Picchi, Riccardo Da Soghe, Lorenzo Cocchi, Maxime Rotenberg, Lorenzo Tarchi, Bruno Facchini, Lorenzo Mazzei |
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| Rok vydání: | 2022 |
| Předmět: |
Physics
Jet (fluid) 020209 energy Mechanical Engineering Flow (psychology) Energy Engineering and Power Technology Aerospace Engineering Mechanics 02 engineering and technology 010501 environmental sciences 01 natural sciences Physics::Fluid Dynamics Fuel Technology Nuclear Energy and Engineering Position (vector) Control system Heat transfer 0202 electrical engineering electronic engineering information engineering 0105 earth and related environmental sciences |
| Zdroj: | Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling J. Eng. Gas Turbines Power |
| ISSN: | 1528-8919 0742-4795 |
| DOI: | 10.1115/1.4052953 |
| Popis: | The goal of the present work is to investigate the effect of supply pipe position on the heat transfer features of various active clearance control (ACC) geometries, characterized by different jet-to-jet distances. All geometries present 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. Measurements are performed using the steady-state technique, obtained by heating up the target plate thanks to an electrically heated Inconel foil applied on the side of the target opposite to the jets. Temperature is also measured on this side by means of an IR camera. Heat transfer is then evaluated thanks to a custom designed finite difference procedure, capable of solving the inverse conduction problem on the target plate. The effect of pipe positioning is studied in terms of pipe-to-target distance (from 3 to 11 jet diameters) and pipe orientation (i.e. rotation around its axis, from 0° to 40° with respect to target normal direction), while the investigated jet Reynolds numbers range from 6000 to 10000. The obtained results reveal that heat transfer is maximized for a given pipe-to-target distance, dependent on both jet-to-jet distance and target surface extension. Pipe rotation also affects the cooling features in a non-monotonic way, suggesting the existence of different flow regimes related to jet inclination. |
| Databáze: | OpenAIRE |
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