Investigation Of Cavity Designs On Various Airfoils

Vasudevan, Yuvneesh (2021) Investigation Of Cavity Designs On Various Airfoils. Project Report. Universiti Sains Malaysia, Pusat Pengajian Kejuruteraan Aeroangkasa. (Submitted)

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Abstract

Aerodynamic efficiency loss in airfoils is primarily due to the increased drag caused by boundary layer separation, especially at low Reynolds number. To reenergise the boundary layer and delay flow separation, cavities are introduced on the suction side of the airfoil. A cavity is a passive flow controller used to overcome a higher adverse pressure gradient and energise the low momentum boundary layers near the airfoil surface. In this paper, a total of 6 different airfoils is chosen to study the effect of the cavity and its design specification in term of size, shape, location, and number. The modified airfoils will be constructed in SOLIDWORKS and tested in PROFILI software which uses the XFOIL interface to calculate the airfoil's lift coefficient (Cl), drag coefficient (Cd), lift -to- drag ratio (l/d). It was found that the Clark y benefits the most when the cavity is introduced on the airfoil's suction side. Among the four different oval shapes, Oval Os provides a better l/d for Clark y, GEMINI and E387 airfoils, where the l/d increase by 11.41%,1.22% 0.015%, respectively. Besides that, among the four different sizes, the cavity with 0.01 w/c gives the best aerodynamic performance to Clark y airfoil where the l/d of the airfoil is increased 9.03%. Apart from the Clark y airfoil, the cavity with 0.01w/c also helps to reduce the Cd of GEMINI. E387 and NLF0416 by 4.80%, 6.42% and 4.59% respectively. From the analysis on the number of cavities, it was found that the single cavity works better for some of the airfoils, especially for Clark y airfoil. Moreover, for the multipole cavity, the Cd of the GEMINI, NLF 0416 and E387 airfoils is reduced; unfortunately, the airfoil's Cl also decreases, affecting the aerodynamic performance.

Item Type: Monograph (Project Report)
Subjects: T Technology
Divisions: Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Aeroangkasa (School of Aerospace Engineering) > Monograph
Depositing User: Mr Mohamed Yunus Mat Yusof
Date Deposited: 15 Sep 2022 07:49
Last Modified: 15 Sep 2022 07:49
URI: http://eprints.usm.my/id/eprint/54732

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