Turbulent intensity effect on low reynolds number airfoil wake

S. Wang, Y. Zhou, M. M. Alam, Hongxing Yang

Research output: Chapter in book / Conference proceedingChapter in an edited book (as author)Academic researchpeer-review

3 Citations (Scopus)

Abstract

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.
Original languageEnglish
Title of host publicationLecture Notes in Mechanical Engineering
Pages197-202
Number of pages6
DOIs
Publication statusPublished - 1 Jan 2014

Publication series

NameLecture Notes in Mechanical Engineering
Volume8
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364

Keywords

  • Airfoil wake
  • Lift and drag forces
  • Low Reynolds number
  • Turbulence intensity

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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