Drag reduction by uniform blowing on the pressure surface of an airfoil

Senri Miura, Masahiro Ohashi, Koji Fukagata, Naoko Tokugawa

Research output: Contribution to journalArticlepeer-review

Abstract

Drag reduction effect by uniform blowing (UB) on the pressure surface of an airfoil is investigated through wind-tunnel experiments. The experiments are conducted using a Clark-Y airfoil model. The UB is realized by supplying air from an external compressor to a chamber, covered with a porous surface, installed near the leading edge of the pressure surface of the airfoil model. To investigate the effect of UB on friction drag, velocity profiles in the boundary layer on the pressure surface are measured using a hot-wire anemometer, and it is confirmed that the velocity profiles shift away from the airfoil surface by UB. The local friction drag reduction rate is quantitatively evaluated by using the law of the wall, and about 50% local friction drag reduction is confirmed by UB at 0.33% of the freestream velocity at the chord Reynolds number Rec 0.65 × 106 . Besides, the pressure distribution in the wake is measured with a pitot tube to investigate the effect of UB on the total drag. The measurement result indicates that the total drag is reduced by UB about 5%, although the measurement uncertainty is estimated to be on the same order.

Original languageEnglish
Pages (from-to)2241-2250
Number of pages10
JournalAIAA journal
Volume60
Issue number4
DOIs
Publication statusPublished - 2022

ASJC Scopus subject areas

  • Aerospace Engineering

Fingerprint

Dive into the research topics of 'Drag reduction by uniform blowing on the pressure surface of an airfoil'. Together they form a unique fingerprint.

Cite this