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160430

Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions.

Article

Last updated: 04 Jan 2025

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Subjects

-

Tags

Mechanical Power Engineering

Abstract

The average film cooling effectiveness is numerically investigated under different conditions of Reynolds numbers and rotation speeds at the suction side of the turbine blade. Three locations of the injection holes row were checked from the blade leading edge at 10%, 31%, and 69% of the blade axial chord length. Coolant is injected from eleven cylindrical holes at rotational speeds ranged from 0 to 4600 rpm and blowing ratios ranged from 0.91 to 2. For the mainstream hot gases, the investigation is performed at five Reynolds numbers of 50,000, 87,300, 300,000, 500,000, and 700,000. The inlet temperature of the coolant is 650 K, while the hot gases inlet temperature is 1500 K for all the studied cases. Location 1 shows the optimum average film cooling effectiveness. Near the film holes, the enhancement in the average film cooling effectiveness of location 1 is by 22% than location 2 and 35% than location 3. For location 1, the effectiveness is enhanced by 57% as the blowing ratio increases from M=0.91 to M=2. For location 2, the effectiveness improves as the rotational speed increases from 0 rpm until it reaches the optimum value at 900 rpm. Also, it is perceived that as the Reynolds number increases, the effectiveness worsens because of the increase in the hot mainstream momentum.

DOI

10.21608/bfemu.2021.160430

Keywords

Film cooling, Film holes row location, Blowing ratio, rotation, Reynolds number

Authors

First Name

Ismail

Last Name

El-Helw

MiddleName

Ezz-El Deen

Affiliation

Teaching Assistant at Mechanical Power Engineering Department., Badr University Cairo., Badr 11829., Egypt.

Email

ismail.ezz.mail@gmail.com

City

mansoura

Orcid

0000-0001-9803-6850

First Name

Salah

Last Name

El-Emam

MiddleName

H.

Affiliation

Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura 35516., Egypt.

Email

selemam45@yahoo.com

City

mansoura

Orcid

-

First Name

Gamal

Last Name

Sultan

MiddleName

Ibrahim

Affiliation

Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Email

gisultan@mans.edu.eg

City

Mansoura

Orcid

-

First Name

Waleed

Last Name

El-Awady

MiddleName

M.

Affiliation

Associate professor., Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Email

welawady@yahoo.com

City

mansoura

Orcid

-

Volume

46

Article Issue

1

Related Issue

20965

Issue Date

2021-03-01

Receive Date

2021-01-17

Publish Date

2021-04-01

Page Start

14

Page End

21

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 46_Issue 1_Pages 14-21.pdf

PDF . 1.7MB

Link

https://bfemu.journals.ekb.eg/article_160430.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=160430

Order

28

Type

case studies

Type Code

1,207

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions.

Details

Type

Article

Created At

22 Jan 2023