Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32586
Aerodynamic Bicycle Torque Augmentation with a Wells Turbine in Wheels

Authors: Tsuyoshi Yamazaki, Etsuo Morishita


Cyclists often run through a crosswind and sometimes we experience the adverse pressure. We came to an idea that Wells turbine can be used as power augmentation device in the crosswind something like sails of a yacht. Wells turbine always rotates in the same direction irrespective of the incoming flow direction, and we use it in the small-scale power generation in the ocean where waves create an oscillating flow. We incorporate the turbine to the wheel of a bike. A commercial device integrates strain gauges in the crank of a bike and transmitted force and torque applied to the pedal of the bike as an e-mail to the driver’s mobile phone. We can analyze the unsteady data in a spreadsheet sent from the crank sensor. We run the bike with the crank sensor on the rollers at the exit of a low-speed wind tunnel and analyze the effect of the crosswind to the wheel with a Wells turbine. We also test the aerodynamic characteristics of the turbine separately. Although power gain depends on the flow direction, several Watts increase might be possible by the Wells turbine incorporated to a bike wheel.

Keywords: Aerodynamics, wells turbine, bicycle, wind engineering.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 728


[1] M. Suzuki and C. Arakawa, “CFD Analysis on flow around Wells turbine for wave-power generating system (in Japanese)”, Proceedings of the 15th symposium on computational fluid dynamics, E10-2, 2015, pp.1-5.
[2] M. Inoue, “Wave power generation and Wells turbine (in Japanese)”, B. Turbomachinery, Vol.13, No.5, 1985, pp.278-284.
[3] M. Suzuki, “Characteristics of Wells turbine for wave power generating system and potential theory”, Trans. JSME (B), Vol.72, No.715, 2006, pp.678-684.
[4] K. Takasaki, T. Tsunematsu, M.Takao, M M Ashraful Alam and T. Setoguchi, “Wells turbine for wave energy conversion-effect of trailing edge shape-“, Int. J. Fluid Machinery and Systems, Vol.9, No.4 2016, pp.307-312.
[5] T. Yamazaki and E. Morishita, “Aerodynamically assisted bicycle by Wells turbine”, Proc. 22nd Sky Sports Symposium 2016, JSASS-2016-6002, pp.5-8.
[6] T. Yamazaki and E. Morishita, “Crank torque measurement of aerodynamically assisted bicycles by Wells turbine”, Proc.23rd Sky Sports Symposium 2017, JSASS-2017-6002, pp.6-9.