What is it about?

Dynamic stall is a hot research topic in the field of aerodynamics. We use high spatial-temporal resolution pressure measurement technique to study the scale effect during dynamic stall for the first time, explain the mechanism of dynamic stall scale effect occurrence, and construct a nonlinear model between vortex complexity, model scale and pressure.

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Why is it important?

It is generally believed that the aerodynamic performance of the models is the same under the same similar criterion conditions. Our study finds that in dynamic experiments of airfoil, even under the same similar criterion (Reynolds number and reduced frequency), the aerodynamic performance of airfoils with different scales may be different and exhibit significant scale effects, which are caused by unsteady wall disturbances and flow transition. This study explores the mechanism of the effect of unsteady wall disturbance on the scale effect, which helps to improve the dynamic wind tunnel experimental technology of airfoil, and provides technical support for the design of high performance helicopter rotor blades and large wind turbine blades.

Perspectives

I am honored to work with my collaborators on this paper, and I hope that this paper will draw attention to dynamic experimental techniques for airfoil and stimulate interest in dynamic stall. Airfoil itself is a niche concept, but dynamic stall is a non-deterministic phenomenon widely found in engineering and nature. We are very pleased to be able to investigate certain phenomena in dynamic stall and hope that a wide range of researchers will participate in it.

Binbin Wei
Xi'an Jiaotong University

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This page is a summary of: Scale effect during the dynamic stall of dynamic airfoil, Physics of Fluids, August 2022, American Institute of Physics, DOI: 10.1063/5.0098619.
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