Investigation of force transients during transverse and vortex gust encounters

Hülya Biler; Anya R. Jones; Murat Saritas; Idil Fenercioglu; Oksan Cetiner; Murat Bronz

doi:10.2514/6.2019-0636

Investigation of force transients during transverse and vortex gust encounters

Hülya Biler, Anya R. Jones, Murat Saritas, Idil Fenercioglu, Oksan Cetiner, Murat Bronz

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

5 Citations (Scopus)

Abstract

This paper studies and compares the effects of transverse and vortex gust encounters. A sine-squared transverse gust was physically created in a water-filled towing tank via a free jet, while a vortex gust was created in a water channel by placing a gust generator plate that undergoes a clockwise half-rotation upstream of the test model. Force and flow field measurements were acquired in both cases. It was found that the gust encounter results in large force transients that follow similar trends during both the transverse and vortex gust encounters. In both cases, unsteady forcing was found to have dependency on time varying effective angle of attack. In order to mitigate the gust effects on lift, different pitching maneuvers were investigated and it has been found that forces produced by a pitching motion can dominate the force produced in a gust encounter.

Original language	English
Title of host publication	AIAA Scitech 2019 Forum
Publisher	American Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)	9781624105784
DOIs	https://doi.org/10.2514/6.2019-0636
Publication status	Published - 2019
Event	AIAA Scitech Forum, 2019 - San Diego, United States Duration: 7 Jan 2019 → 11 Jan 2019

Publication series

Name	AIAA Scitech 2019 Forum

Conference

Conference	AIAA Scitech Forum, 2019
Country/Territory	United States
City	San Diego
Period	7/01/19 → 11/01/19

Bibliographical note

Publisher Copyright:
� 2019 by German Aerospace Center (DLR). Published by the American Institute of Aeronautics and Astronautics, Inc.

Funding

The authors (HB and ARJ) gratefully acknowledge support from the Air Force Office of Scientific Research under grant FA9550-16-1-0508. Work at ITU is supported by TUBITAK Grant 115M358 (For the Application on UAVs and MAVs, Gust Effect on the Performance of Wings in Motion (Maneuver or Flapping) and Flow Control Attempts).

Funders	Funder number
TUBITAK	115M358
UAVs
Air Force Office of Scientific Research	FA9550-16-1-0508

Access to Document

10.2514/6.2019-0636

Cite this

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title = "Investigation of force transients during transverse and vortex gust encounters",

abstract = "This paper studies and compares the effects of transverse and vortex gust encounters. A sine-squared transverse gust was physically created in a water-filled towing tank via a free jet, while a vortex gust was created in a water channel by placing a gust generator plate that undergoes a clockwise half-rotation upstream of the test model. Force and flow field measurements were acquired in both cases. It was found that the gust encounter results in large force transients that follow similar trends during both the transverse and vortex gust encounters. In both cases, unsteady forcing was found to have dependency on time varying effective angle of attack. In order to mitigate the gust effects on lift, different pitching maneuvers were investigated and it has been found that forces produced by a pitching motion can dominate the force produced in a gust encounter.",

author = "H{\"u}lya Biler and Jones, {Anya R.} and Murat Saritas and Idil Fenercioglu and Oksan Cetiner and Murat Bronz",

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AU - Biler, Hülya

AU - Jones, Anya R.

AU - Saritas, Murat

AU - Fenercioglu, Idil

AU - Cetiner, Oksan

AU - Bronz, Murat

N1 - Publisher Copyright: � 2019 by German Aerospace Center (DLR). Published by the American Institute of Aeronautics and Astronautics, Inc.

PY - 2019

Y1 - 2019

N2 - This paper studies and compares the effects of transverse and vortex gust encounters. A sine-squared transverse gust was physically created in a water-filled towing tank via a free jet, while a vortex gust was created in a water channel by placing a gust generator plate that undergoes a clockwise half-rotation upstream of the test model. Force and flow field measurements were acquired in both cases. It was found that the gust encounter results in large force transients that follow similar trends during both the transverse and vortex gust encounters. In both cases, unsteady forcing was found to have dependency on time varying effective angle of attack. In order to mitigate the gust effects on lift, different pitching maneuvers were investigated and it has been found that forces produced by a pitching motion can dominate the force produced in a gust encounter.

AB - This paper studies and compares the effects of transverse and vortex gust encounters. A sine-squared transverse gust was physically created in a water-filled towing tank via a free jet, while a vortex gust was created in a water channel by placing a gust generator plate that undergoes a clockwise half-rotation upstream of the test model. Force and flow field measurements were acquired in both cases. It was found that the gust encounter results in large force transients that follow similar trends during both the transverse and vortex gust encounters. In both cases, unsteady forcing was found to have dependency on time varying effective angle of attack. In order to mitigate the gust effects on lift, different pitching maneuvers were investigated and it has been found that forces produced by a pitching motion can dominate the force produced in a gust encounter.

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PB - American Institute of Aeronautics and Astronautics Inc, AIAA

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Y2 - 7 January 2019 through 11 January 2019

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Investigation of force transients during transverse and vortex gust encounters

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