INVESTIGATION ON UNSTEADY BEHAVIOR OF NEAR-WAKE FLOW OF A BLUNT-BASE BODY BY AN OPTICAL-FLOW ALGORITHM

  • Tran The Hung Le Quy Don Technical University
  • Chu Hoang Quan Le Quy Don Technical University
  • Trinh Xuan Long Le Quy Don Technical University

Tóm tắt

In this study, an optical-flow algorithm was applied to analyzing unsteady behavior of near-wake flow. The experiment was conducted at low-speed conditions and at Reynolds number around ReD = 1.97×104 to obtain image database for optical-flow processing. Measurement frequency was at 2000 fps. Results of the optical-flow algorithm were compared to previous studies by a traditional cross-correlation method. The ability of optical flow method to extract flow fields was, thereby, confirmed for blunt-base flow at low-speed conditions. Differing from previous studies and cross-correlation results, optical-flow results showed a dominated Strouhal number at around StD = 0.015, which is connected to vortex shedding behavior of the wake-flow. Additionally, the antisymmetric flow shows the most important behavior at low-speed conditions.

điểm /   đánh giá
Phát hành ngày
2020-11-26
In ra
Tập. 15 Số. 05 (2020)
Chuyên mục
BAI BAO KHOA HOC