Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire

Abstract This experiment measured the instantaneous temperature and velocity field synchronously in non-isothermal turbulent boundary layer in a rotating straight channel with a parallel-array hot-wire probe. The Reynolds number based on the bulk mean velocity (U) and hydraulic diameter (D) is 19000...

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Autores principales:	Li Gangfu, Li Haiwang, You Ruquan, Wu Huijie, Tao Zhi, Xia Shuangzhi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/82fb3735666244e785577d071804eb3a
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spelling	oai:doaj.org-article:82fb3735666244e785577d071804eb3a2021-12-02T17:41:08ZExperimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire10.1038/s41598-020-66853-62045-2322https://doaj.org/article/82fb3735666244e785577d071804eb3a2020-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-66853-6https://doaj.org/toc/2045-2322Abstract This experiment measured the instantaneous temperature and velocity field synchronously in non-isothermal turbulent boundary layer in a rotating straight channel with a parallel-array hot-wire probe. The Reynolds number based on the bulk mean velocity (U) and hydraulic diameter (D) is 19000, and the rotation numbers are 0, 0.07, 0.14, 0.21 and 0.28. The mean velocity u and mean temperature T as well as their fluctuating quantity u’ and T’ were measured at three streamwise locations (x/D = 4.06, 5.31, 6.56). A method for temperature-changing calibration with constant temperature hot-wire anemometers was proposed. It achieved the calibration in operational temperature range (15.5 °C–50 °C) of the hot-wire via a home-made heating section. The measurement system can obtain the velocity and temperature in a non-isothermal turbulent boundary layer at rotating conditions. The result analysis mainly contains the dimensionless mean temperature, temperature fluctuation as well as its skewness and flatness and streamwise turbulent heat flux. For the trailing side, the rotation effect is more obvious, and makes the dimensionless temperature profiles lower than that under static conditions. The dimensionless streamwise heat flux shows a linear decrease trend in the boundary layer. It is hoped that this research can improve our understanding of the flow and heat transfer mechanism in the internal cooling passages of turbine rotor blades.Li GangfuLi HaiwangYou RuquanWu HuijieTao ZhiXia ShuangzhiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-15 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Li Gangfu Li Haiwang You Ruquan Wu Huijie Tao Zhi Xia Shuangzhi Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire
description	Abstract This experiment measured the instantaneous temperature and velocity field synchronously in non-isothermal turbulent boundary layer in a rotating straight channel with a parallel-array hot-wire probe. The Reynolds number based on the bulk mean velocity (U) and hydraulic diameter (D) is 19000, and the rotation numbers are 0, 0.07, 0.14, 0.21 and 0.28. The mean velocity u and mean temperature T as well as their fluctuating quantity u’ and T’ were measured at three streamwise locations (x/D = 4.06, 5.31, 6.56). A method for temperature-changing calibration with constant temperature hot-wire anemometers was proposed. It achieved the calibration in operational temperature range (15.5 °C–50 °C) of the hot-wire via a home-made heating section. The measurement system can obtain the velocity and temperature in a non-isothermal turbulent boundary layer at rotating conditions. The result analysis mainly contains the dimensionless mean temperature, temperature fluctuation as well as its skewness and flatness and streamwise turbulent heat flux. For the trailing side, the rotation effect is more obvious, and makes the dimensionless temperature profiles lower than that under static conditions. The dimensionless streamwise heat flux shows a linear decrease trend in the boundary layer. It is hoped that this research can improve our understanding of the flow and heat transfer mechanism in the internal cooling passages of turbine rotor blades.
format	article
author	Li Gangfu Li Haiwang You Ruquan Wu Huijie Tao Zhi Xia Shuangzhi
author_facet	Li Gangfu Li Haiwang You Ruquan Wu Huijie Tao Zhi Xia Shuangzhi
author_sort	Li Gangfu
title	Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire
title_short	Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire
title_full	Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire
title_fullStr	Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire
title_full_unstemmed	Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire
title_sort	experimental investigation on velocity and temperature field in a rotating non-isothermal turbulent boundary layer using hot-wire
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/82fb3735666244e785577d071804eb3a
work_keys_str_mv	AT ligangfu experimentalinvestigationonvelocityandtemperaturefieldinarotatingnonisothermalturbulentboundarylayerusinghotwire AT lihaiwang experimentalinvestigationonvelocityandtemperaturefieldinarotatingnonisothermalturbulentboundarylayerusinghotwire AT youruquan experimentalinvestigationonvelocityandtemperaturefieldinarotatingnonisothermalturbulentboundarylayerusinghotwire AT wuhuijie experimentalinvestigationonvelocityandtemperaturefieldinarotatingnonisothermalturbulentboundarylayerusinghotwire AT taozhi experimentalinvestigationonvelocityandtemperaturefieldinarotatingnonisothermalturbulentboundarylayerusinghotwire AT xiashuangzhi experimentalinvestigationonvelocityandtemperaturefieldinarotatingnonisothermalturbulentboundarylayerusinghotwire
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Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire

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