Advances in aircraft and spacecraft science

  • 제1권1호
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  • Pages.27-41
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  • 2014
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  • 2287-528X(pISSN)
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  • 2287-5271(eISSN)
테크노프레스 (Techno-Press)
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DOI QR Code

Circular cylinder drag reduction using piezoelectric actuators

  • Orazi, Matteo (Dipartimento di Ingegneria Meccanica e Aerospaziale) ;
  • Lasagna, Davide (Dipartimento di Ingegneria Meccanica e Aerospaziale) ;
  • Iuso, Gaetano (Dipartimento di Ingegneria Meccanica e Aerospaziale)
  • 투고 : 2013.07.27
  • 심사 : 2013.10.03
  • 발행 : 2014.01.31
⟨ 이전 논문 다음 논문 ⟩

초록

An active flow control technique based on "smart-tabs" is proposed to delay flow separation on a circular cylinder. The actuators are retractable and orientable multilayer piezoelectric tabs which protrude perpendicularly from the model surface. They are mounted along the spanwise direction with constant spacing. The effectiveness of the control was tested in pre-critical and in post-critical regime by evaluating the effects of several control parameters of the tabs like frequency, amplitude, height, angular position and plate incidence with respect to the local flow. Measurements of the mean static pressure distribution around the cylinder were used to estimate the pressure drag coefficient. The maximum drag reduction achieved in the pre-critical regime was of the order of 30%, whereas in the post-critical regime was about 10%, 3% of which due to active forcing. Furthermore, pressure fluctuation measurements were performed and spectral analysis indicated an almost complete suppression of the vortex shedding in active forcing conditions.

키워드

참고문헌

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피인용 문헌

  1. Noise Filtering for Wall-Pressure Fluctuations in Measurements Around a Cylinder With Laminar and Turbulent Flow Separation vol.138, pp.6, 2016, https://doi.org/10.1115/1.4032034