Periodic Behavior of Longitudinal Vortices Downstream of an Active Vortex Generators Pair (Response of Conditional Averaged Mean Velocity)

Abstract

This paper is focused on the conditional averaged characteristics of mean velocity of longitudinal vortices downstream of an active vortex generators pair (AVG) with common-flow up configuration (CFUC). An active control of turbulent boundary layer and/or separation is one of the most challenging projects. It is important to achieve an effective control system based on the information of flow characteristics. Therefore, it is a challenging research to understand the transitional behavior of longitudinal vortices submerged in the turbulent boundary layer. The streamwise vorticity shows more rapid response to the height of the AVG at up-phase compared with at down-phase. The transportation of high velocity fluid beneath the longitudinal vortices plays an important roll on the response of longitudinal vortices to the hight of AVG.