TY - CHAP
T1 - Turbulent intensity effect on low reynolds number airfoil wake
AU - Wang, S.
AU - Zhou, Y.
AU - Alam, M. M.
AU - Yang, Hongxing
PY - 2014/1/1
Y1 - 2014/1/1
N2 - The work investigates the effect of turbulent intensity (Tu) on the force and wake of a NACA0012 airfoil at chord Reynolds number Rec= 5.3 × 103and 2 × 104. Lift and drag coefficients (CLand CD) on and flow fields around the airfoil were measured with Tuvaried from 0.6 to 6.0%. Four Recregimes are identified based on the characteristics of the maximum lift coefficient (CL,max), i.e., ultra-low (Rec<104), low (104~ 3 × 105), moderate (3 × 105~ 5 × 106), and high (>5 × 106). It is noted that at Rec= 5.3 × 103(ultra-low Recregime) the stall is absent for Tu= 0.6% but occurs for Tu= 2.6 and 6.0%. As Rec increases to low Recregimes, the Tuinfluence decreases. So does the critical Rec, above which stall occurs. The effect of increasing Tu on flow bears similarity to that of increasing Rec, albeit with a difference; the flowseparation point shifts upstreamwith increasing Recbut downstream with increasing Tu.
AB - The work investigates the effect of turbulent intensity (Tu) on the force and wake of a NACA0012 airfoil at chord Reynolds number Rec= 5.3 × 103and 2 × 104. Lift and drag coefficients (CLand CD) on and flow fields around the airfoil were measured with Tuvaried from 0.6 to 6.0%. Four Recregimes are identified based on the characteristics of the maximum lift coefficient (CL,max), i.e., ultra-low (Rec<104), low (104~ 3 × 105), moderate (3 × 105~ 5 × 106), and high (>5 × 106). It is noted that at Rec= 5.3 × 103(ultra-low Recregime) the stall is absent for Tu= 0.6% but occurs for Tu= 2.6 and 6.0%. As Rec increases to low Recregimes, the Tuinfluence decreases. So does the critical Rec, above which stall occurs. The effect of increasing Tu on flow bears similarity to that of increasing Rec, albeit with a difference; the flowseparation point shifts upstreamwith increasing Recbut downstream with increasing Tu.
KW - Airfoil wake
KW - Lift and drag forces
KW - Low Reynolds number
KW - Turbulence intensity
UR - http://www.scopus.com/inward/record.url?scp=84951185561&partnerID=8YFLogxK
U2 - 10.1007/978-3-642-40371-2_29
DO - 10.1007/978-3-642-40371-2_29
M3 - Chapter in an edited book (as author)
T3 - Lecture Notes in Mechanical Engineering
SP - 197
EP - 202
BT - Lecture Notes in Mechanical Engineering
ER -