Measurement of boundary layer transition on oscillating airfoil using cntTSP in low-speed wind tunnel

Tsubasa Ikami, Koji Fujita, Hiroki Nagai, Daisuke Yorita

Research output: Contribution to journalArticlepeer-review

Abstract

cntTSP is a flow visualization technique that combines temperature-sensitive paint (TSP) and carbon nanotube (CNT). TSP is a sprayable temperature sensor, and CNT is used as a thin inner electric heater for the TSP. The cntTSP technique allows the visualization of the movement of the boundary layer transition on a moving airfoil. In this study, cntTSP was applied to a pitch-oscillating airfoil in a low-speed wind tunnel. Three methods were compared as methods for detecting the boundary layer transition position. The transition position was successfully evaluated using a heat transfer coefficient that was calculated by the surface temperature. Moreover, at a high-reduced frequency, the detected transition positions were different between the pitching-up and pitching-down procedure. Moreover, we observed a hysteresis loop of the transition position.

Original languageEnglish
Article number075301
JournalMeasurement Science and Technology
Volume32
Issue number7
DOIs
Publication statusPublished - 2021 Jul

Keywords

  • boundary layer transition
  • carbon nanotube temperature-sensitive paint
  • heat transfer coefficient

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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