Numerical study of effect of solidity on vertical axis wind turbine with Gurney flap

Gurney flap is a miniature lift-enhancement device installed at the airfoil trailing edge and has been successfully applied to fixed wing aircraft and low-speed horizontal wind turbines. In this ar...

https://journals.sagepub.com/doi/pdf/10.1177/1687814018803804

Experimental and numerical study on the performance of an axial fan with a Gurney flap

For a variable-pitch axial fan with guide vanes, the effect of three series of Gurney flaps (GFs) configured at the trailing edge of blades on the performance and dynamics is numerically investigat...

Effect of Gurney Flap on Performance and Aeroacoustics of Variable-Pitch Axial Fans

Two-dimensional steady Reynolds-averaged Navier-Stokes (RANS) equations with transition shear stress transport (SST) model were solved to investigate the effects of Gurney flaps on the aerodynamic performance of a low Reynolds number airfoil. This airfoil was designed for flight vehicles operating at 20 km altitude with freestream velocity of 25 m/s. The chord length (C) of this airfoil is 5 m and the corresponding Reynolds number is 7.76×105. Gurney flaps with the heights ranging from 0.25%C to 3%C were investigated. It has been shown that Gurney flaps can enhance not only the prestall lift but also lift-to-drag ratio in a certain range of angles of attack. Specially, at cruise angle of attack (3°), Gurney flap with the height of 0.5%C can increase lift-to-drag ratio and lift coefficient by 1.6% and 12.8%, respectively. Furthermore, the mechanisms of Gurney flaps to improve the aerodynamic performance were illustrated by analyzing the surface pressure distribution, streamlines and trailing-edge flow structure for this low Reynolds number airfoil. Specially, distinguished from some other numerical researches, the flow details such as the laminar separation bubble and transition phenomena for low Reynolds number airfoil with Gurney flaps were investigated and it was found that Gurney flaps can delay the transition onset position at small angles of attack (≤2°). However, with the increase of angles of attack, Gurney flaps will promote the boundary layer transition.

Numerical simulation of gurney flaps lift-enhancement on a low reynolds number airfoil

In this paper, the numerical simulation was used to investigate the effects of the leading-edge slat installation angles (β for airfoils from 0° to 40° and β1 for blades from −20° to 40°) on the ae...

Muqing Yang

Papers

Numerical simulation of Gurney flap on SFYT15thick airfoil

Numerical simulation of gurney flaps lift-enhancement on a low reynolds number airfoil