Passive Flow Control of Rotary-Wing and Fixed-Wing Aircraft Airfoils Via Surface-Based Trapped Vortex Generators

Abstract

A novel passive flow control concept for subsonic and transonic flows over 2D airfoils is proposed and examined via CFD. The control concept is based on the local modification of the airfoil geometry via a newly proposed Surface-based Trapped Vortex

Passive flow control of shock-induced dynamic stall via surface-based trapped vortex generators

“…More details on how this fluctuation was introduced are provided in Al-Jaburi. 17 It was expected that this case will produce transonic flow at the maximum of the Mach number, and consequently, it presents the possibility to examine how would the passive flow control systems of Ref. 15 affect both the transonic flow and ddynamic stall within one rotor cycle.…”

“…The computational domain design and reconfiguration (and also the explanations) were discussed in detail in Refs. 16 and 17. The current domain is rectangular, with 1000 c by 520 c size (with the inlet fixed at 20 c ) and with the airfoil positioned in the middle of the rotating domain.…”

“…It is worth mentioning that since the velocity modifications at the inlet boundary take time to transmit to the airfoil, the resulted velocity profile at the airfoil location was shifted relative to that at the inlet because of wave progressing time delay. Al-Jaburi 16,17 provides a detailed description of how to address the time difference accurately. The same approach was used in the current study.…”

“…The computational mesh generation techniques used in Refs 16 and 17. were also adopted in the current study.…”

“…Using this mesh and with the help of the steady-state flow initialization technique, no initial transient was needed. 16,17 Verification of the numerical setup was conducted via an in-depth grid-dependence study. Full details of the verification tests are available in Refs.…”