Infrared thermography investigation of transitional flow over isolated roughness at high speed

Qingqing Ye; Ferdinand Schrijer; Fulvio Scarano

Infrared thermography investigation of transitional flow over isolated roughness at high speed

Qingqing Ye, Ferdinand Schrijer, Fulvio Scarano

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

The transitional flow features over and downstream of isolated roughness elements in hypersonic flow are investigated by means of infrared thermography. The local heat flux distribution in the wake of the roughness element reveals the footprint of multiple streamwise counter-rotating vortex pairs. The formation of a turbulent wedge with the spanwise spreading of the wake in the downstream region indicates the early stage of transition and breakdown to turbulence. The onset location of transition is predicted by detecting the origin of the turbulent wedge. Strong dependence of the transition process on the roughness geometry is observed, with significant variations of the lateral spreading rate in the turbulent wedge. Instead, for the present flow conditions negligible variations are associated to changes in Re_h

Original language	English
Title of host publication	51st 3AF International Conference on Applied Aerodynamics
Subtitle of host publication	Strasbourg - France
Pages	1-10
Number of pages	10
Publication status	Published - Apr 2016
Event	51st 3AF International Conference on Applied Aerodynamics: Thermal effects and aerodynamics - Strasbourg, France Duration: 4 Apr 2017 → 6 Apr 2017 Conference number: 51 http://www.3af-aerodynamics2016.com/

Conference

Conference	51st 3AF International Conference on Applied Aerodynamics
Abbreviated title	Aerodynamics 2016
Country/Territory	France
City	Strasbourg
Period	4/04/17 → 6/04/17
Internet address	http://www.3af-aerodynamics2016.com/

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FP29-2016-qingqingye Final published version, 1.78 MB

Cite this

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title = "Infrared thermography investigation of transitional flow over isolated roughness at high speed",

abstract = "The transitional flow features over and downstream of isolated roughness elements in hypersonic flow are investigated by means of infrared thermography. The local heat flux distribution in the wake of the roughness element reveals the footprint of multiple streamwise counter-rotating vortex pairs. The formation of a turbulent wedge with the spanwise spreading of the wake in the downstream region indicates the early stage of transition and breakdown to turbulence. The onset location of transition is predicted by detecting the origin of the turbulent wedge. Strong dependence of the transition process on the roughness geometry is observed, with significant variations of the lateral spreading rate in the turbulent wedge. Instead, for the present flow conditions negligible variations are associated to changes in Reh",

author = "Qingqing Ye and Ferdinand Schrijer and Fulvio Scarano",

year = "2016",

month = apr,

language = "English",

pages = "1--10",

booktitle = "51st 3AF International Conference on Applied Aerodynamics",

note = "51st 3AF International Conference on Applied Aerodynamics : Thermal effects and aerodynamics, Aerodynamics 2016 ; Conference date: 04-04-2017 Through 06-04-2017",

url = "http://www.3af-aerodynamics2016.com/",

}

Infrared thermography investigation of transitional flow over isolated roughness at high speed. / Ye, Qingqing; Schrijer, Ferdinand ; Scarano, Fulvio.
51st 3AF International Conference on Applied Aerodynamics: Strasbourg - France. 2016. p. 1-10 FP29-2016-qingqingye.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Infrared thermography investigation of transitional flow over isolated roughness at high speed

AU - Ye, Qingqing

AU - Schrijer, Ferdinand

AU - Scarano, Fulvio

N1 - Conference code: 51

PY - 2016/4

Y1 - 2016/4

N2 - The transitional flow features over and downstream of isolated roughness elements in hypersonic flow are investigated by means of infrared thermography. The local heat flux distribution in the wake of the roughness element reveals the footprint of multiple streamwise counter-rotating vortex pairs. The formation of a turbulent wedge with the spanwise spreading of the wake in the downstream region indicates the early stage of transition and breakdown to turbulence. The onset location of transition is predicted by detecting the origin of the turbulent wedge. Strong dependence of the transition process on the roughness geometry is observed, with significant variations of the lateral spreading rate in the turbulent wedge. Instead, for the present flow conditions negligible variations are associated to changes in Reh

AB - The transitional flow features over and downstream of isolated roughness elements in hypersonic flow are investigated by means of infrared thermography. The local heat flux distribution in the wake of the roughness element reveals the footprint of multiple streamwise counter-rotating vortex pairs. The formation of a turbulent wedge with the spanwise spreading of the wake in the downstream region indicates the early stage of transition and breakdown to turbulence. The onset location of transition is predicted by detecting the origin of the turbulent wedge. Strong dependence of the transition process on the roughness geometry is observed, with significant variations of the lateral spreading rate in the turbulent wedge. Instead, for the present flow conditions negligible variations are associated to changes in Reh

UR - http://resolver.tudelft.nl/uuid:d8a31e2a-5d91-4dff-ad2c-20cf12d0b861

M3 - Conference contribution

SP - 1

EP - 10

BT - 51st 3AF International Conference on Applied Aerodynamics

T2 - 51st 3AF International Conference on Applied Aerodynamics

Y2 - 4 April 2017 through 6 April 2017

ER -

Infrared thermography investigation of transitional flow over isolated roughness at high speed

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