This work aims to gain relatively thorough understanding of unsteady flow structures around an Ahmed body and associated predominated Strouhal numbers StAp based on the square root of the frontal area A. Extensive hotwire and flow visualization measurements were conducted in a wind tunnel at ReA =6:59 × 104 over the roof, the rear window, and behind the vertical base of this body with a slant angle of 25°. Four distinct Strouhal numbers have been identified. StA=0:196 and 0.140 are detected above the roof. StA=0:196 is captured again over the rear window, along with another unsteady structure of StA=0:265. Behind the vertical base, the wake is dominated by the quasiperiodic structures of StA=0:442. A conceptual flow structure model is proposed based on the present data as well as those in the literature.
|Name||Lecture Notes in Mechanical Engineering|
- Automotive Engineering
- Aerospace Engineering
- Mechanical Engineering
- Fluid Flow and Transfer Processes