Proposal of a method to measure aerodynamic forces without using force sensors in wind tunnel testing of tumbling plates
A new wind tunnel test method is proposed to measure the aerodynamic forces act on the tumbling plate and the tension of the tow string in the wind tunnel not by using force sensors but by measuring the tow position. The tumbling phenomenon is considered to be an important phenomenon for aircraft flight safety because of the possibility of falling objects from aircrafts reaching far away or for knowing the behavior of falling roof tiles blown off by strong winds. Therefore, many tests to measure the force act on the tumbling plate in wind tunnel have been conducted. However, since the rotation of the test piece is accompanied by difficulties ex. support interference, movement restrictions, etc. However, according to present method, the aerodynamic forces act on the tumbling plate in wind tunnel can be measured optically in a non-contact manner, and an expensive force sensor is not required. Furthermore, it is also effective under conditions such as low wind velocity, in which the aerodynamic forces are buried in the measurement accuracy of the force sensors. This paper explains this wind tunnel test method from the viewpoint of dynamic balance and reports the results of verification wind tunnel test in which the effectiveness of this method was confirmed.
B. Kakimpa, D. M. Hargreaves and J. S. Owen, “An investigation of plate-type windborne debris flight using coupled CFD-RBD models. Part I: Model development and validation”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.111, pp.95-103, 2012. DOI: 10.1016/j.jweia.2012.07.008
B. Kakimpa, D. M. Hargreaves and J. S. Owen, “An investigation of plate-type windborne debris flight using coupled CFD-RBD models. Part II: Free and constrained flight”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.111, pp.104-116, 2012. DOI: 10.1016/j.jweia.2012.07.011
D. M. Hargreaves, B. Kakimpa and J. S. Owen, “The computational fluid dynamics modeling of the autorotation of square, flat plates”, Journal of Fluids and Structures, Vol.46, pp.111-133, 2014. DOI: 10.1016/j.jfluidstructs.2013.12.006
Y. Tanabe and K. Kaneko, “Behavior of a Falling Paper”, Physical Review Letters, Vol.73, No.10, pp.1372-1375, 1994. DOI: 10.1103/PhysRevLett.73.1372
A. C. DeVoria and K. Mohseni, “A vortex model for forces and moments on low-aspect-ratio wings in side-slip with ex- perimental validation”, Proceedings of the royal society A, Vol.473, No.2198, 2017. DOI: 10.1098/rspa.2016.0760
A. Andersen, U. Pesavento and Z. J. Wang, “Unsteady aerodynamics of fluttering and tumbling plates”, Journal of Fluid Mechanics, Vol.541, pp.65-90, 2005. DOI: 10.1017/S002211200500594X
W. B. Wang, R. F. Hu, S. J. Hu and Z. N. Wu, “Influence of aspect ratio on tumbling plates”, Journal of Fluid Mechanics, Vol.733, pp.650-679, 2013. DOI: 10.1017/jfm.2013.461
K. Hirata, K. Shimizu, K. Fukuhara, K. Yamauchi, D. Kawaguchi and J. Funaki “Aerodynamic Characteristics of a Tumbling Plate under Free Flight”, Journal of Fluid Science and Technology, Vol.4, No.1, pp.168-187, 2009. DOI: 10.1299/jfst.4.168
M. Tachikawa, “Trajectories of flat plate in uniform flow with application to wind-generated missiles”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.14, pp.443-453, 1983. DOI: 10.1016/0167-6105(83)90045-4
H. Sato, T. Tokiwa, H. Mihara, T. Noguchi and K. Hirata, “Experiment on basic performance of a simple water- wheel/windmill with a cross-stream axis”, Earth and Evolutional Science, Vol.240, No.4, pp.042019, 2019. DOI: 10.1088/1755-1315/240/4/042019
M. Ishiguro and Y. Miyake, “Experimental Study on Directional Stability of Tumbling Plate”, Journal of the Institute of Industrial Applications Engineers, Vol.9, No.1, pp.1-8, 2021. DOI: 10.12792/JIIAE.9.1
P. Dupleich, “Rotation in free fall of rectangular wings of elongated shape”, NACA TM-1201, pp.1-99, 1949.
A. C. Bustamante and G. W. Stone, “The autorotation characteristics of various shapes for subsonic and hypersonic flows”, AIAA Paper, No.69-132, 1969. DOI: 10.2514/6.1969-132
J. D. Inversen, “Autorotating flat-plate wings, the effect of the moment of inertia, geometry and Reynolds number”, J. of Fluid Mechanics, Vol.92, No.2, pp.327-348, 1979. DOI: 10.1017/S0022112079000641
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