Experimental analysis of cell pattern on grid fin aerodynamics in subsonic flow

Tripathi, Manish and M S, Mahesh and Misra, Ajay (2020) Experimental analysis of cell pattern on grid fin aerodynamics in subsonic flow. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 234 (3). ISSN 0954-4100

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Abstract

Grid fins consisting of a lattice of high aspect ratio planar members encompassed by an outer frame are unconventional control surfaces used on numerous missiles and bombs due to their enhanced lifting characteristics at high angles of attack and across wider Mach number regimes. The current paper accomplishes and compares the effect of different grid fin patterns on subsonic flow aerodynamics of grid fins by virtue of the determination of their respective aerodynamic forces. Furthermore, this study deliberates the impact of gap variation on aerodynamics of different patterns. Results enunciate enhanced aerodynamic efficiency, and lift slope for web-fin cells and single diamond patterns compared to the baseline model. Moreover, the study indicates improved aerodynamic performance for diamond patterns with higher gaps by providing elevated maximum lift coefficient, delayed stall angle, and comparable drag at lower angles. The study established the presence of an additional effect termed as the inclination effect alongside the cascade effect leading to deviations with respect to lift, stall, and aerodynamic efficiency amongst different gap variants of the individual patterns. Thus, optimization based on the aerodynamic efficiency, stall angle requirements, and construction cost by optimum pattern and gap selection can be carried out through this analysis, which can lead to elevated aerodynamic performance for grid fins.

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IITH Creators:

IITH Creators	ORCiD
M S, Mahesh	UNSPECIFIED

Item Type:

Article

Additional Information:

The authors would like to thank the Department of Aerospace Engineering of Defence Institute of Advanced Technology, who provided them the necessary funds to carry out the experiments. They would like to convey their deepest gratitude towards Wing Commander KS Vijay who assisted them in acquiring the final wind tunnel results. The authors would also like to thank the staff of MART, NAL Bangalore who provided insight and expertise that greatly assisted in performing the experiments.

Uncontrolled Keywords:

aerodynamic efficiency, cascade effect, gap-to-chord ratio, grid fins, stall angle, subsonic flow, Wind tunnel, Indexed in Scopus and WoS

Subjects:

Physics > Mechanical and aerospace

Divisions:

Department of Mechanical & Aerospace Engineering

Depositing User:

Team Library

Date Deposited:

11 Nov 2019 09:16

Last Modified:

03 Nov 2022 13:58