Aerodynamic response of a naca-0012 airfoil undergoing non-sinusoidal pitching waveforms

Hisham M. Shehata, Mohamed Y. Zakaria, Muhammad R. Hajj, Craig A. Woolsey

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The aerodynamic responses of a NACA-0012 airfoil undergoing different pitching waveforms are investigated experimentally. Four different pure pitching trajectories including sinusoidal, trapezoidal, sawtooth and reverse sawtooth waveforms are considered. The airfoil is set at mean angles of attack (AoA) of α0= 3.5, 7, and 12with a waveform pitching amplitude of αA= 3.5. Reduced frequencies are varied from k = 0.025 to 0.140. The free stream velocity is set to 4.7 m/s, which yielded a chord Reynolds number of Re = 2.1 x 104. Static lift and drag coefficients are measured prior to running the unsteady experiments to establish a baseline for comparison. The objective of the experiment is to assess the lift production as a result of the time-varying airfoil motion, and to compare the measured unsteady aerodynamic response against quasi-steady and unsteady state-space models. Experimental results show that a trapezoidal waveform provides the most significant gain in the lift amplitude followed by the reverse sawtooth waveform. Other waveforms experienced slightly larger lift deficiency factor as a result of experiencing different flow circulation at the wake of their respective motion.

Original languageEnglish
Title of host publicationAIAA Scitech 2019 Forum
DOIs
StatePublished - 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 7 Jan 201911 Jan 2019

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego
Period7/01/1911/01/19

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