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Bio-inspired optimization of leading edge slat

Mohamed Arif Raj Mohamed (Department of Aerospace Engineering, SRMIST, Kattankulathur, India)
Ketu Satish Kumar Reddy (Department of Aerospace and Applied Mechanics, Indian Institute of Engineering Science and Technology, Shibpur, India)
Somaraju Sai Sri Vishnu (Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 2 December 2022

29

Abstract

Purpose

The high lift devices are effective at high angle of attack to increase the coefficient of lift by increasing the camber. But it affects the low angle of attack aerodynamic performance by increasing the drag. Hence, they have made as a movable device to deploy only at high angles of attack, which increases the design and installation complexities. This study aims to focus on the comparison of aerodynamic efficiency of different conventional leading edge (LE) slat configurations with simple fixed bioinspired slat design.

Design/methodology/approach

This research analyzes the effect of LE slat on aerodynamic performance of CLARK Y airfoil at low and high angles of attack. Different geometrical parameters such as slat chord, cutoff, gap, width and depth of LE slat have been considered for the analysis.

Findings

It has been found that the LE slat configuration with slat chord 30% of airfoil chord, forward extension 8% of chord, dip 3% of chord and gap 0.75% of chord gives higher aerodynamic efficiency (Cl/Cd) than other LE slat configurations, but it affects the low angles of attack aerodynamic performance with the deployed condition. Hence, this optimum slat configuration is further modified by closing the gap between LE slat and the main airfoil, which is inspired by the marine mammal’s nose. Thus increases the coefficient of lift at high angles of attack due to better acceleration over the airfoil nose and as well enhances the aerodynamic efficiency at low angles of attack.

Research limitations/implications

The two-dimensional computational analysis has been done for different LE slat’s geometrical parameters at low subsonic speed.

Practical implications

This bio-inspired nose design improves aerodynamic performance and increases the structural strength of aircraft wing compared to the conventional LE slat. This fixed design avoids the complex design and installation difficulties of conventional movable slats.

Social implications

The findings will have significant impact on the fields of aircraft wing and wind turbine designs, which reduces the design and manufacturing complexities.

Originality/value

Different conventional slat configurations have been analyzed and compared with a simple fixed bioinspired slat nose design at low subsonic speed.

Keywords

Citation

Raj Mohamed, M.A., Kumar Reddy, K.S. and Sai Sri Vishnu, S. (2022), "Bio-inspired optimization of leading edge slat", Aircraft Engineering and Aerospace Technology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/AEAT-06-2022-0150

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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