| Autor: |
E. de Paola, Stefano Meloni, Roberto Camussi, A. Di Marco |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Springer Proceedings in Physics ISBN: 9783030221959 |
| DOI: |
10.1007/978-3-030-22196-6_29 |
| Popis: |
Many current and future aircraft designs deal with the problem of jet noise prediction methods when the flow interacts with part of the airplane structure. Data regarding how a planar surface interacts with a jet are limited. To this purpose, an experimental study has been conducted in the Roma TRE semi-anechoic chamber of the Aeroacoustics Laboratory using a Background Oriented Schlieren (BOS) technique. The technique was applied to a compressible circular jet flow interacting with a flat-plate positioned parallel to the axial direction. The aim of the work is to investigate how the planar surface interacts with the high-speed jet flow and influences the shock cell structures, for this reason the BOS set up has been configured specifically to meet the optical constrains related to the jet-surface geometry. Measurements have been performed at different Mach numbers in high subsonic, sonic and slightly under-expanded conditions and considering three relative positions of the plate with respect to the jet axis. The density gradient field is evaluated using a cross-correlation algorithm. The acquired images have been post-processed to obtain the density field by numerical integration of the Poisson equation and analysed together with the wall pressure signals. To improve the solution a patching technique procedure has been developed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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