Study of the Effect of Curve-Type Vortex Generator Pairs with Perforated and Flat Holes on Airfoil Performance

Abstract

In order to understand the processes of heat transfer, the investigation studies the flow and thermal properties of flat and curving generators with perforated sheets. The investigation conducts numerical simulations of the third dimension in a channel with two VGs located on the bottom of the wall, and varying the Re number from 3,000 to 27,500. The increase in heat transfer and pressure loss is quantified using the dimensionless parameters Num/Num0, f/f0, and R = ( Num/Num0)/(f/f0). The results demonstrate that VGs with punched holes have a higher Num/ Num0 ratio than VGs without punched holes across all Re values, the greatest difference being observed at Re = 15,000. The coefficient of static friction (f/f0) initially increases rapidly, then reaches a steady state with Re, the highest of which is achieved by the RWP due to its larger area in comparison to the airflow in the P-series of VGs. Curved VGs CRW and CRWH have a greater effect on reducing drag and lowering the f/f0 of the device than flat VGs because of their streamlined configuration. The jet's flow from the perforations facilitates the clearance of still fluids and reduces the pressure differential between before and after the VGs. Also, the hydraulic heat capacity R is more beneficial in a curved VG than in a flat VG because of the enhanced heat transfer and lower wire consumption. The coefficient of thermal efficiency is determined by the combination of the Coulburn's and friction's coefficients, with CRWH having the greatest resistance. When Re is 9,000, a rectangularVG with holes has a higher performance than a counterpart that lacks holes, the maximum difference between the two is 33.2%.