Effect of incidence angle on turbine blade heat transfer characteristics (I) - Blade tip

Dong Ho Rhee, Hyung Hee Cho

Research output: Contribution to journalArticle

Abstract

The present study investigated local heat/mass transfer characteristics on the tip of the rotating turbine blade with various incoming flow incidence angles. The experiments are conducted in a low speed annular cascade with a single stage turbine. The blade has a flat tip with a mean tip clearance of 2.5% of the blade chord. The incoming flow Reynolds number is 1.5×10 5 at design condition. To examine the effect of off-design condition, the experiments with various incidence angles ranging between -15° and +7° were conducted. A naphthalene sublimation method is used to measure detailed mass transfer coefficient on the blade. The results indicated that the incidence angle strongly affects the behavior of tip leakage flow around the blade tip and consequently plays an important role in determining heat transfer characteristics on the tip. For negative incidence angles, the heat/mass transfer in the upstream region on the tip decreases by up to 20%. On the contrary, for positive incidence angles, much higher heat transfer coefficients are observed even with small increase of incidence angle.

Original languageEnglish
Pages (from-to)349-356
Number of pages8
JournalTransactions of the Korean Society of Mechanical Engineers, B
Volume31
Issue number4
DOIs
Publication statusPublished - 2007 Jan 1

Fingerprint

Turbomachine blades
Turbines
Mass transfer
Heat transfer
Cascades (fluid mechanics)
Sublimation
Naphthalene
Heat transfer coefficients
Reynolds number
Experiments
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

@article{9313039a5d5841df9c3db5bca338cec4,
title = "Effect of incidence angle on turbine blade heat transfer characteristics (I) - Blade tip",
abstract = "The present study investigated local heat/mass transfer characteristics on the tip of the rotating turbine blade with various incoming flow incidence angles. The experiments are conducted in a low speed annular cascade with a single stage turbine. The blade has a flat tip with a mean tip clearance of 2.5{\%} of the blade chord. The incoming flow Reynolds number is 1.5×10 5 at design condition. To examine the effect of off-design condition, the experiments with various incidence angles ranging between -15° and +7° were conducted. A naphthalene sublimation method is used to measure detailed mass transfer coefficient on the blade. The results indicated that the incidence angle strongly affects the behavior of tip leakage flow around the blade tip and consequently plays an important role in determining heat transfer characteristics on the tip. For negative incidence angles, the heat/mass transfer in the upstream region on the tip decreases by up to 20{\%}. On the contrary, for positive incidence angles, much higher heat transfer coefficients are observed even with small increase of incidence angle.",
author = "Rhee, {Dong Ho} and Cho, {Hyung Hee}",
year = "2007",
month = "1",
day = "1",
doi = "10.3795/KSME-B.2007.31.4.349",
language = "English",
volume = "31",
pages = "349--356",
journal = "Transactions of the Korean Society of Mechanical Engineers, B",
issn = "1226-4881",
publisher = "Korean Society of Mechanical Engineers",
number = "4",

}

Effect of incidence angle on turbine blade heat transfer characteristics (I) - Blade tip. / Rhee, Dong Ho; Cho, Hyung Hee.

In: Transactions of the Korean Society of Mechanical Engineers, B, Vol. 31, No. 4, 01.01.2007, p. 349-356.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of incidence angle on turbine blade heat transfer characteristics (I) - Blade tip

AU - Rhee, Dong Ho

AU - Cho, Hyung Hee

PY - 2007/1/1

Y1 - 2007/1/1

N2 - The present study investigated local heat/mass transfer characteristics on the tip of the rotating turbine blade with various incoming flow incidence angles. The experiments are conducted in a low speed annular cascade with a single stage turbine. The blade has a flat tip with a mean tip clearance of 2.5% of the blade chord. The incoming flow Reynolds number is 1.5×10 5 at design condition. To examine the effect of off-design condition, the experiments with various incidence angles ranging between -15° and +7° were conducted. A naphthalene sublimation method is used to measure detailed mass transfer coefficient on the blade. The results indicated that the incidence angle strongly affects the behavior of tip leakage flow around the blade tip and consequently plays an important role in determining heat transfer characteristics on the tip. For negative incidence angles, the heat/mass transfer in the upstream region on the tip decreases by up to 20%. On the contrary, for positive incidence angles, much higher heat transfer coefficients are observed even with small increase of incidence angle.

AB - The present study investigated local heat/mass transfer characteristics on the tip of the rotating turbine blade with various incoming flow incidence angles. The experiments are conducted in a low speed annular cascade with a single stage turbine. The blade has a flat tip with a mean tip clearance of 2.5% of the blade chord. The incoming flow Reynolds number is 1.5×10 5 at design condition. To examine the effect of off-design condition, the experiments with various incidence angles ranging between -15° and +7° were conducted. A naphthalene sublimation method is used to measure detailed mass transfer coefficient on the blade. The results indicated that the incidence angle strongly affects the behavior of tip leakage flow around the blade tip and consequently plays an important role in determining heat transfer characteristics on the tip. For negative incidence angles, the heat/mass transfer in the upstream region on the tip decreases by up to 20%. On the contrary, for positive incidence angles, much higher heat transfer coefficients are observed even with small increase of incidence angle.

UR - http://www.scopus.com/inward/record.url?scp=34248197162&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34248197162&partnerID=8YFLogxK

U2 - 10.3795/KSME-B.2007.31.4.349

DO - 10.3795/KSME-B.2007.31.4.349

M3 - Article

VL - 31

SP - 349

EP - 356

JO - Transactions of the Korean Society of Mechanical Engineers, B

JF - Transactions of the Korean Society of Mechanical Engineers, B

SN - 1226-4881

IS - 4

ER -