CFD analysis of aerofoil using dimples and prevent radar signals using stealth technology
Journal Title: Archives of Materials Science and Engineering - Year 2016, Vol 77, Issue 2
Abstract
Purpose: The main objective of aircraft aerodynamics is to enhance the aerodynamiccharacteristics and maneuverability of the aircraft. This enhancement includes the reductionin drag and stall phenomenon. The airfoil which contains dimples will have comparativelyless drag than the plain airfoil. Introducing dimples on the aircraft wing will create turbulenceby creating vortices which delays the boundary layer separation resulting in decrease ofpressure drag and also increase in the angle of stall. In addition, wake reduction leads toreduction in acoustic emission. The overall objective of this paper is to improve the aircraftmaneuverability by delaying the flow separation point at stall and thereby reducing the dragby applying the dimple effect over the aircraft wing.Design/methodology/approach: This project includes computational analysis of dimpleeffect on aircraft wing, using NACA 0018 airfoil. Dimple shapes are circular which locatesthe inward, outward are selected for the analysis; airfoil is tested under the inlet velocity of30m/s at different angle of attack (-5°, 0°, 5°, 10°, and 15°).Findings: This analysis favors the dimple effect by increasing L/D ratio and therebyproviding the maximum aerodynamic efficiency, which provides the enhanced performancefor the aircraft.Practical implications: Stealth technology is based on the principle of reflection andabsorption that makes the objects’ observability lower and stealthy. A 'stealth' vehicle willgenerally have been designed from the motive to reduce RCS (Radar Cross Section) ofaircrafts i.e. radar signature of aircrafts.
Authors and Affiliations
R. Maheswaran
Keywords
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