Effective implementation of the microblowing technique on airfoils /

The Micro Blowing Technique (MBT) which has been proven by NASA to reduce skin friction drag on a flat plate by up to 70 to 80 percent in the subsonic speed regime, outperforms the conventional blowing by means of adopting micro holes to ensure the introduction of minimal effective roughness. Past r...

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Bibliographic Details
Main Author: Zohary, Aideal Czar (Author)
Format: Thesis
Language:English
Published: Kuala Lumpur : Kulliyyah of Engineering, International Islamic University Malaysia, 2021
Subjects:
Online Access:http://studentrepo.iium.edu.my/handle/123456789/10678
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100 1 |a Zohary, Aideal Czar,  |e author 
245 1 0 |a Effective implementation of the microblowing technique on airfoils /  |c by Aideal Czar Zohary 
264 1 |a Kuala Lumpur :   |b Kulliyyah of Engineering, International Islamic University Malaysia,   |c 2021 
300 |a xvi, 100 leaves :  |b colour illustrations ;  |c 30cm. 
336 |2 rdacontent  |a text 
337 |2 rdamedia  |a unmediated 
337 |2 rdmedia  |a computer 
338 |2 rdacarrier  |a volume 
338 |2 rdacarrier  |a online resource 
347 |2 rdaft  |a text file  |b PDF 
500 |a Abstracts in English and Arabic. 
500 |a "A thesis submitted in fulfilment of the requirement for the degree of Master of Science (Mechanical Engineering)." --On title page. 
502 |a Thesis (MSMCT)--International Islamic University Malaysia, 2021. 
504 |a Includes bibliographical references (leaves 91-96). 
520 |a The Micro Blowing Technique (MBT) which has been proven by NASA to reduce skin friction drag on a flat plate by up to 70 to 80 percent in the subsonic speed regime, outperforms the conventional blowing by means of adopting micro holes to ensure the introduction of minimal effective roughness. Past researchers have failed to effectively apply MBT on airfoils. The aim of this study is to ensure reduction in both components of drag on an airfoil in subsonic flows through investigating proper selection of airfoils and strategic blowing placement. Based on a detailed in-depth analysis of their work and reasons for earlier failures, a conclusion has been reached that MBT performs well on concave pressure-recovery type of airfoils when positioned in the positive pressure drag region on the lower surface near the trailing edge. The S1223 airfoil that has a sufficient extent of this region while featuring high-lift properties and mild stall characteristics makes it an excellent candidate for effective MBT applications and UAV design. Demonstrated evidence through numerical investigation showed that a proper implementation of MBT on a S1223 airfoil improves its lift-to drag ratio by 30%. A simple and effective CFD modelling of MBT on a Clark Y airfoil shows trends similar to published experimental data involving hot wire and wake pressure measurements. Results consist of the effect of Reynolds number, blowing fraction and contribution of individual drag components to aid understanding on how MBT influences the overall flow and drag. The CFD results are also validated against XFOIL. The findings indicate that total drag reduction is heavily dependent in the manner in which MBT affects the pressure distribution around the airfoil. A proper selection of the region in which micro blowing is located will lead to a significant reduction in pressure drag. At a Reynolds number of 0.3 x 106, drop in skin friction drag reached almost 5% while reduction in pressure drag is about 37.5% across a range of angles of attack when having MBT applied at 0.68-0.80 x/c. It is concluded that the integration of properly located MBT on concave pressure-recovery type of airfoils should produce significant improvement in their performance. 
596 |a 1 
650 0 |a Aerofoils 
650 0 |a Aerofoils  |x Aerodynamics 
655 |a Theses, IIUM local 
690 |a Dissertations, Academic  |x Department of Mechanical Engineering  |z IIUM 
700 1 |a Waqar Asrar,  |e degree supervisor 
700 1 |a Erwin Sulaeman,  |e degree supervisor 
700 1 |a Mohammed Aldheeb,  |e degree supervisor 
710 2 |a International Islamic University Malaysia.  |b Department of Mechanical Engineering 
856 4 |u http://studentrepo.iium.edu.my/handle/123456789/10678 
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