A New THL Model for High Accuracy of Predicted Journal Surface Temperature

A thermo-hydrodynamic lubrication (THL) theory is applied to journal bearings that support large-sized high-speed rotary machineries and it is confirmed that the maximum pad surface temperature under operation is below an allowable limit value. The temperature predicted by the traditional THL model...

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Autores principales:	Kiyoshi Hatakenaka, Yoshitaka Baba, Yuki Kameyama
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2020
Materias:	hydrodynamic bearing thermohydrodynamic lubrication model journal surface temperature pad surface temperature tilting pad journal bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/0c402beaf4cc4e1e85926a10785940a6
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spelling	oai:doaj.org-article:0c402beaf4cc4e1e85926a10785940a62021-11-05T09:08:00ZA New THL Model for High Accuracy of Predicted Journal Surface Temperature1881-219810.2474/trol.15.194https://doaj.org/article/0c402beaf4cc4e1e85926a10785940a62020-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/15/4/15_194/_pdf/-char/enhttps://doaj.org/toc/1881-2198A thermo-hydrodynamic lubrication (THL) theory is applied to journal bearings that support large-sized high-speed rotary machineries and it is confirmed that the maximum pad surface temperature under operation is below an allowable limit value. The temperature predicted by the traditional THL model is in good agreement with the measurement. However, the predicted journal surface temperature is not comparable with the measurement. In the present paper, it is firstly shown that the amount of heat, which is generated by the shear flow in the oil film and is discharged out of the film, is evaluated appropriately in the film near the pad surface while it is evaluated excessively in the film near the journal surface. Secondly, a new THL model is proposed that the oil film temperature near the pad surface and the temperature near the journal surface are obtained independently, that is, the conventional energy equation for the oil film is solved for the former temperature while the equation described in the relative coordinate system with the journal surface as the reference one is used for the latter temperature. Lastly, it is shown that the THL model can predict the journal surface temperature comparable with the measurement without deteriorating the accuracy of the predicted maximum pad surface temperature.Kiyoshi HatakenakaYoshitaka BabaYuki KameyamaJapanese Society of Tribologistsarticlehydrodynamic bearingthermohydrodynamic lubrication modeljournal surface temperaturepad surface temperaturetilting pad journal bearingPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 15, Iss 4, Pp 194-200 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrodynamic bearing thermohydrodynamic lubrication model journal surface temperature pad surface temperature tilting pad journal bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	hydrodynamic bearing thermohydrodynamic lubrication model journal surface temperature pad surface temperature tilting pad journal bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kiyoshi Hatakenaka Yoshitaka Baba Yuki Kameyama A New THL Model for High Accuracy of Predicted Journal Surface Temperature
description	A thermo-hydrodynamic lubrication (THL) theory is applied to journal bearings that support large-sized high-speed rotary machineries and it is confirmed that the maximum pad surface temperature under operation is below an allowable limit value. The temperature predicted by the traditional THL model is in good agreement with the measurement. However, the predicted journal surface temperature is not comparable with the measurement. In the present paper, it is firstly shown that the amount of heat, which is generated by the shear flow in the oil film and is discharged out of the film, is evaluated appropriately in the film near the pad surface while it is evaluated excessively in the film near the journal surface. Secondly, a new THL model is proposed that the oil film temperature near the pad surface and the temperature near the journal surface are obtained independently, that is, the conventional energy equation for the oil film is solved for the former temperature while the equation described in the relative coordinate system with the journal surface as the reference one is used for the latter temperature. Lastly, it is shown that the THL model can predict the journal surface temperature comparable with the measurement without deteriorating the accuracy of the predicted maximum pad surface temperature.
format	article
author	Kiyoshi Hatakenaka Yoshitaka Baba Yuki Kameyama
author_facet	Kiyoshi Hatakenaka Yoshitaka Baba Yuki Kameyama
author_sort	Kiyoshi Hatakenaka
title	A New THL Model for High Accuracy of Predicted Journal Surface Temperature
title_short	A New THL Model for High Accuracy of Predicted Journal Surface Temperature
title_full	A New THL Model for High Accuracy of Predicted Journal Surface Temperature
title_fullStr	A New THL Model for High Accuracy of Predicted Journal Surface Temperature
title_full_unstemmed	A New THL Model for High Accuracy of Predicted Journal Surface Temperature
title_sort	new thl model for high accuracy of predicted journal surface temperature
publisher	Japanese Society of Tribologists
publishDate	2020
url	https://doaj.org/article/0c402beaf4cc4e1e85926a10785940a6
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A New THL Model for High Accuracy of Predicted Journal Surface Temperature

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