LONGITUDINAL DYNAMIC DERIVATIVES OF AN AIRFOIL UNDER PITCHING AND PLUNGING OSCILLATIONS IN WIND TUNNEL

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RASI MARZABADI FAEZEH; KAMALI MOGHADDAM RAMIN

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Journal: Modares Mechanical Engineering Year:2014 | Volume:14 | Issue:10 Page(s): 160-166

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Title

LONGITUDINAL DYNAMIC DERIVATIVES OF AN AIRFOIL UNDER PITCHING AND PLUNGING OSCILLATIONS IN WIND TUNNEL

Author(s)

RASI MARZABADI FAEZEH | KAMALI MOGHADDAM RAMIN | Issue Writer Certificate

Keywords

LONGITUDINAL DYNAMIC DERIVATIVEQ2

WIND TUNNELQ2

AIRFOILQ2

PITCHINGQ2

PLUNGINGQ2

Abstract

In this study, LONGITUDINAL DYNAMIC DERIVATIVEs of an AIRFOIL of the type NACA 6-series, oscillating in PITCHING and PLUNGING motions were calculated using variation of PITCHING moment coefficients with angle of attack in various conditions, based on WIND TUNNEL data. Various parameters of the tests were mean angle of attack, reduced frequency and amplitude of oscillation. To calculate the LONGITUDINAL DYNAMIC DERIVATIVEs in harmonic oscillations, the Taylor's series and integral of Fourier were used. Both the methods had the same results and could be extended to each flight vehicles. The effect of parameters on variation of longitudinal oscillatory derivatives was investigated, in three different regions of oscillation: before, over and post stall conditions. The results showed that variation of the longitudinal oscillatory coefficients with angle of attack is different in the pre-stall and over stall conditions with respect to post-stall region. The effect of reduced frequency on stability of the motion is different for two types of oscillations. Increasing the reduced frequency resulted in reducing the stability of PLUNGING motion, but has a little effect on the stability of PITCHING motion.

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APA: Copy

RASI MARZABADI, FAEZEH, & KAMALI MOGHADDAM, RAMIN. (2014). LONGITUDINAL DYNAMIC DERIVATIVES OF AN AIRFOIL UNDER PITCHING AND PLUNGING OSCILLATIONS IN WIND TUNNEL. MODARES MECHANICAL ENGINEERING, 14(10), 160-166. SID. https://sid.ir/paper/177830/en

Vancouver: Copy

RASI MARZABADI FAEZEH, KAMALI MOGHADDAM RAMIN. LONGITUDINAL DYNAMIC DERIVATIVES OF AN AIRFOIL UNDER PITCHING AND PLUNGING OSCILLATIONS IN WIND TUNNEL. MODARES MECHANICAL ENGINEERING[Internet]. 2014;14(10):160-166. Available from: https://sid.ir/paper/177830/en

IEEE: Copy

FAEZEH RASI MARZABADI, and RAMIN KAMALI MOGHADDAM, “LONGITUDINAL DYNAMIC DERIVATIVES OF AN AIRFOIL UNDER PITCHING AND PLUNGING OSCILLATIONS IN WIND TUNNEL,” MODARES MECHANICAL ENGINEERING, vol. 14, no. 10, pp. 160–166, 2014, [Online]. Available: https://sid.ir/paper/177830/en

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