مؤتمر
Intake Geometry and Shear Layer Ingestion Effects on Embedded Propelling Fan Performance
| العنوان: | Intake Geometry and Shear Layer Ingestion Effects on Embedded Propelling Fan Performance |
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| المؤلفون: | Efstathiadis, Theofilos G., Gkoutzamanis, Vasilis G., Vourakis, Michalis E., Kalfas, Anestis I. |
| سنة النشر: | 2018 |
| المجموعة: | Zenodo |
| مصطلحات موضوعية: | Unsteady Flows & Accoustics, Intake Geometry, Shear Layer Ingestion Effects, Embedded Propelling Fan Performance |
| الوصف: | This work presents an experimental investigation for the effect s of three - dimensional flow phenomena, which unfold at boundary layer ingestion (BLI) aero - engine intakes of S - shaped geometry, on the performance of a one - stage multi fan compressor unit. The experimental setup consists of two groups of fans: the first one simulates the cruise velocity, while the second one constitutes the compressor unit. Three cases are examined: a straight duct intake as the baseline case and two S - shaped cases. The variable parameter which alters through an inherent mechanism is the length over height ratio (L/H) that characterizes the intake geometry. Oil and dye visualization method is used at the suction area upstream of the compressor unit array for the various intake shapes. Total and static pressure measurements are also performed at the aerodynamic interface plane (AIP) and cross section areas across the intake. This is achieved with a pneumatic five - hole probe which is built and calibrated at the Laboratory of Fluid Mechanics and Turbomachinery of Aristotle University of Thessaloniki (AUTH). The results of the flow visualization, show that the transition of intake geometry from a straight duct towards S - shaped aggressive geometries of decreasing L/H ratios, causes a movement of the saddle points upstream and an enlargement of corner vortices. Pneumatic measurements at various cross - section areas across the S - duct focusing on the central fan, reveal increasing energy losses and verify the existence of counter rotating vortices, especially when the more aggressive intake is used (lower L/H). Additionally, the maximum flow angles are achieved at the most aggressive geometry. The isolation of the suction area of the fan from the flow above it, is the most intense. Furthermore, although distortion effects, are maximized upstream of the compressor array for geometries of higher offset, compression ability of the fan at proximate cross section areas, is not affected as compared to the straight duct. Finally, ... |
| نوع الوثيقة: | conference object |
| اللغة: | English |
| العلاقة: | https://zenodo.org/communities/gpps-na-2018Test; https://zenodo.org/record/1345564Test; https://doi.org/10.5281/zenodo.1345564Test; oai:zenodo.org:1345564 |
| DOI: | 10.5281/zenodo.1345564 |
| الإتاحة: | https://doi.org/10.5281/zenodo.1345564Test https://doi.org/10.5281/zenodo.1345563Test https://zenodo.org/record/1345564Test |
| حقوق: | info:eu-repo/semantics/openAccess ; https://creativecommons.org/licenses/by-nc-nd/4.0/legalcodeTest |
| رقم الانضمام: | edsbas.C5F58E89 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5281/zenodo.1345564 |
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