Faculty Publications

Now showing 1 - 4 of 4

Design of Mechanically Actuated Aerodynamic Braking System on a Formula Student Race Car
(Springer India, 2018) Muralidharan, V.; Balakrishnan, A.; Vardhan, V.K.; Meena, N.; Kumar, Y.S.
Every second in a racing competition counts the performance of a team against the other. Many innovative and sophisticated techniques are being employed to overcome loses in time and add to the performance of the vehicle. Especially in a car racing challenge there is more freedom to install these innovative systems to empower the car to maximum efficiency due to availability of more space. At the global spectrum there are few events which encourage such innovations. Formula Student Racing competitions are one of the global events organized by the Society of Automotive Engineers of different countries which gives opportunity to university students to build and race formula style cars. Like any other racing competitions in this high octane event having an inch over their opponents is always an advantage. Not just better acceleration and high velocities but also good deceleration is required to excel in the competition. Aerodynamic braking system is utilizing the aerodynamic drag force to create high deceleration. This mechanism can be installed on any car with spoilers with minimum modification. Being a student event great amount of care needs to be given to the safety concerns of the driver. © 2017, The Institution of Engineers (India).
AERODYNAMIC ANALYSIS OF WING WITH LEADING EDGE PROTUBERANCES USING PRANDTL’S LIFTING LINE THEORY
(Begell House Inc., 2022) Sathyabhama, A.; Marathe, A.; Rangapure, S.; Potadar, A.
The establishment of active or passive flow control techniques over aircraft wings has been an area of continuous effort of experimental as well as theoretical investigations. The passive flow control method of leading edge modification has proven to be effective in improving the lift performance of a wing. Extensive performance analysis of sinusoidal tubercles and the wavy wing has been conducted in the literature. This work aims to determine whether other leading edge geometric modifications like square and triangular protrusions similar to sinusoidal tubercles can provide the same effects. The aerodynamic performance of the wings with sinusoidal, square, and triangular tubercles with amplitudes of 3 mm, 5 mm, 7 mm, and 9 mm and wavelengths of 8 mm, 16 mm, 32 mm, and 64 mm is investigated using Prandtl’s lifting line theory. The effect of wavelength and amplitude variation on lift coefficient (CL) and coefficient of induced drag (CDi) is studied within the prestall regime. The results have shown that CL and CDi reduce and the ratio of these coefficients (CL/CDi) improves for the tubercled wing when compared to the baseline wing. The effect of wavelength variation is found to be negligible. In contrast, amplitude variation showed a maximum increase of CL/CDi in the wing with square tubercles, where it reached 305.15 at 1° AoA, for an amplitude of 9 mm. © 2022 by Begell House, Inc.
Aerostructural performance improvement in an unmanned long endurance aircraft using adaptive wing concept
(SAGE Publications Ltd, 2023) Sampath, A.K.; Padmanabhan, M.A.; Kattimani, S.
This paper presents an analytical research study to improve the aerostructural performance of an unmanned medium altitude long endurance aircraft using the adaptive wing concept. Aerodynamic drag and wing root loads are minimized by optimal scheduling of multiple trailing edge flaps located on the wing. A trim optimization process is developed specifically for this purpose. The aeroelastic model is based on finite element formulation for the structure and doublet lattice method for the aerodynamics. A nonlinear numerical lifting line method is used, in combination with airfoil wind tunnel data, to estimate the induced and total drags. Results are presented for the current aircraft configuration and a more flexible proposed configuration, thereby providing an uncommon perspective on the effect of flexibility on the adaptive wing. For example, the benefits of optimal flap deployment turn out to be greater for the flexible aircraft than for the rigid one. It is hoped that this work and its insights will also aid the multidisciplinary design optimization of future aircraft. © IMechE 2023.
NUMERICAL AND EXPERIMENTAL INVESTIGATION INTO THE EFFECT OF LEADING-EDGE PROTUBERANCES ON THE AERODYNAMIC PERFORMANCE OF WIND TURBINE
(Begell House Inc., 2025) Sathyabhama, A.; Sinha, R.K.; Reddy, C.J.
In this paper, the numerical and experimental analysis of the effect of leading-edge protuberances on the performance of small horizontal axis wind turbines (SHAWT) at low Reynolds number was carried out. The wind turbine blades were designed using the blade element momentum theory (BEMT) with wake rotation. The E216 profile was chosen over other airfoils because, in low Reynolds number flow conditions, it gives a high lift-to-drag ratio. The tubercle shapes employed for the study are slot, triangular, and sinusoidal, and their effects on the performance of wind turbine were compared with baseline turbine as well as among themselves. The flow behavior and the influence of pitch angle on the performance of baseline wind turbine were investigated. The numerical simulations were conducted in ANSYS FLUENT R2021, and the experiments carried out in a low-speed wind tunnel were used to validate the results. The numerical equations were solved using a three-dimensional Reynolds-averaged Navier-Stokes equation with a shear stress turbulence (SST) k-? turbulence model. The output power, torque, and coefficient of power (CP) values for the baseline turbine increased up to 25° pitch angle and afterwards, a decline was seen. The optimum tip-speed ratio (TSR) was also investigated and found to be 2.67. The pitch angle 25° provides the greatest improvement among all pitch angles examined for the same blade profile. Hence, for the study of different-shaped tubercles (triangular, sinusoidal, and rectangular slot) pitch angle of 25° was considered. Sinusoidal tubercles show a greater lift-to-drag (CL /CD) ratio than baseline wind turbines, although there is no substantial difference in CP. Furthermore, the CL /CD for triangular and slotted tubercles is more significant than that of the baseline wind turbine, as is the CP. When all three tubercles are compared, the slot has the highest CP, while the sinusoidal wind turbine has the highest CL /CD. © 2025 by Begell House, Inc.

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