TY - JOUR
ID - 106124
TI - Experimental and numerical investigation of unsteady flow around cylinder with four plates perpendicular to it with the rotational degree of freedom
JO - Journal of Aerospace Science and Technology
JA - JAST
LA - en
SN - 1735-2134
AU - Isvand, Hassan
AU - Sharafi, Ahmad
AU - Salmaninejad, Ali
AD - Aerospace Faculty-Shahid Sattari Aeronautical University of Technology
AD - Aerospace Faculty- Shahid Sattari Aeronautical University of Technology- Tehran-Iran
AD - Department of Postgraduate Studies. Shahid Sattari Aeronautical University of Science and Technology
Y1 - 2019
PY - 2019
VL - 12
IS - 1
SP - 1
EP - 14
KW - Unsteady flow
KW - Vortex Panel Method
KW - Rotational and Vibrational motion
KW - Forced Vibration
KW - Wind Tunnel Tests
DO -
N2 - In this study, the behavior of a subject consisting of a cylinder with 4 plates perpendicular to it with a rotational degree of freedom under airflow both through the numerical approach, known as improved discrete vortex and experimental approach were investigated. The experimental and numerical results have shown that oscillating regime occurs in low velocity and length. This movement is vibrations with irregular range around an equilibrium angle of 45 degree. In oscillating motion regime, it is seen that after releasing the object in free flow, a high torque force, due to the flow’s acceleration from the model, is induced to the plates and makes a big angular change, but after a while, the range of oscillation around the equilibrium angle of 45 degree decreases. The probability of rotational motion regime in length ratio of one and velocity of 13 m/sec in initial angle of attack is low. However, the experimental and numerical results have indicated that still in high initial angle of attack around 45 degree, owing to the induced decreased torque to plates, there exists an oscillating movement. Rotational regime in length ratio of 3 and free flow velocity 13 m/sec in all initial angle of attack is observed. In addition, rotational regime appears in all initial angle of attack with the length ratio of 4 and different free flow velocities because of increase in the area of plates.
UR - https://jast.ias.ir/article_106124.html
L1 - https://jast.ias.ir/article_106124_90ded9223fe46d9ef9cb47be5aae5e66.pdf
ER -