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http://dx.doi.org/10.12989/aas.2021.8.3.239

An investigation of boat-tail helmet to reduce drag  

Pathan, Khizar A. (Department of Mechanical Engineering, Trinity College of Engineering and Research)
Khan, Sher A. (Department of Mechanical Engineering, Faculty of Engineering, International Islamic University Malaysia)
Shaikh, Aadil N. (Department of Mechanical Engineering, Trinity College of Engineering and Research)
Pathan, Arsalan A. (Department of Mechanical Engineering, Trinity College of Engineering and Research)
Khan, Shahnawaz A. (Oil and Gas Division, Siemens Energy)
Publication Information
Advances in aircraft and spacecraft science / v.8, no.3, 2021 , pp. 239-250 More about this Journal
Abstract
A helmet is a kind of shielding equipment used to shield the head from fatal injuries. The helmet experiences drag while moving at a certain velocity. The total drag on the helmet increases with an increase in velocity. The drag force at high velocity has a significant effect on the rider's neck and may result in cervical spondylosis. Now a day's neck pain, neck sprain, spondylosis have become significant issues related to the human body. The reduction of drag on the helmet will be a boon for society, which will reduce the force on the neck. The decrease in drag is an essential field of study. The drag force can be reduced by various methods like coating on the surface, modifying the helmet's shape, etc. The study's purpose is to decrease drag on the helmet by improving the helmet's shape. The CFD analysis is carried out to find the best profile of the helmet and fineness ratio of the boat-tailed helmet to minimize drag. The CFD results are validated with the wind tunnel laboratory outcomes. Based on the findings, a considerable reduction in the drag is accomplished at the velocity of 32.5 m/s.
Keywords
boat-tail; CFD; drag; helmet;
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  • Reference
1 Aabid, A., Khairulaman, L.N.B. and Khan, S.A. (2021), "Analysis of flows and prediction of CH10 airfoil for unmanned arial vehicle wing design", Adv. Aircraft Spacecraft Sci., 8(2), 87-109. https://doi.org/10.12989/aas.2021.8.2.087.   DOI
2 Alam, F., Chowdhury, H., Wei, H. Z., Mustary, I. and Zimmer, G. (2014), "Aerodynamics of ribbed bicycle racing helmets", Procedia Eng., 72, 691-696. https://doi.org/10.1016/j.proeng.2014.06.117.   DOI
3 Beaumont, F., Taiar, R., Polidori, G., Trenchard, H. and Grappe, F. (2018), "Aerodynamic study of time-trial helmets in cycling racing using CFD analysis", J. Biomech., 67, 1-8. https://doi.org/10.1016/j.jbiomech.2017.10.042.   DOI
4 Brownlie, L., Ostafichuk, P., Tews, E., Muller, H., Briggs, E. and Franks, K. (2010), "The wind-averaged aerodynamic drag of competitive time trial cycling helmets", Procedia Eng., 2(2), 2419-2424. https://doi.org/10.1016/j.proeng.2010.04.009.   DOI
5 Kalimuthu, R., Mehta, R.C. and Rathakrishnan, E. (2019), "Measured aerodynamic coefficients of without and with spiked blunt body at Mach 6", Adv. Aircraft Spacecraft Sci., 6(3), 225-238. http://doi.org/10.12989/aas.2019.6.3.225.   DOI
6 Khan, S.A., Fatepurwala, M.A. and Pathan, K.N. (2019a), "CFD analysis of human powered submarine to minimize drag", Int. J. Mech. Prod. Eng. Res. Develop., 8(3) 1057-1066. https://doi.org/10.24247/ijmperdjun2018111.   DOI
7 Sathish Gandhi, V.C., Kumaravelan, R., Ramesh, S., Venkatesan, M. and Siva Rama Krishnan, M. (2014), "Aerodynamic design and analysis of motorcycle helmet with anti-glare visor", Tehnicki glasnik, 8(1), 97-101.
8 Meng, Y.S., Yan, L., Huang, W., Ji, C. and Li, J. (2021), "Coupled investigation on drag reduction and thermal protection mechanism of a double-cone missile by the combined spike and multi-jet", Aerosp. Sci. Technol. 115, 1-17. https://doi.org/10.1016/j.ast.2021.106840.   DOI
9 Quadros, J. D., Khan, S. A., Sapkota, S. and Vikram, J. (2020), "On recirculation region length of suddenly expanded supersonic flows, using CFD and fuzzy logic", Int. J. Comput. Fluid D., 34(6), 1-17. https://doi.org/10.1080/10618562.2020.1828580.   DOI
10 Mannion, P., Toparlar, Y., Blocken, B., Clifford, E., Andrianne, T. and Hajdukiewicz, M. (2018), "Aerodynamic drag in competitive tandem para-cycling: Road race versus time-trial positions", J. Wind Eng. Ind. Aerod., 179, 92-101. https://doi.org/10.1016/j.jweia.2018.05.011.   DOI
11 Mehta (2020), "Drag reduction for payload fairing of satellite launch vehicle with aerospike in transonic and low supersonic speeds", Adv. Aircraft Spacecraft Sci., 7(4), 371-385. https://doi.org/10.12989/aas.2020.7.4.371.   DOI
12 Shaikh, S.K., Pathan, K.A., Chaudhary, Z.I. and Khan, S.A (2020), "CFD analysis of an automobile catalytic converter to obtain flow uniformity and to minimize pressure drop across the monolith", CFD Lett., 12(9), 116-128. https://doi.org/10.37934/cfdl.12.9.116128.   DOI
13 Pathan, K.A., Ashfaq, S., Dabeer, P.S. and Khan, S.A. (2019), "Analysis of parameters affecting thrust and base pressure in suddenly expanded flow from nozzle", J. Adv. Res. Fluid Mech. Thermal Sci., 64(1), 1-18.
14 Pathan, K.A., Dabeer, P.S. and Khan, S.A. (2020), "Enlarge duct length optimization for suddenly expanded flows", Adv. Aircraft Spacecraft Sci., 7(3), 203-214. https://doi.org/10.12989/aas.2020.7.3.203.   DOI