Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions.
El-Helw, I., El-Emam, S., Sultan, G., El-Awady, W. (2021). Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions.. EKB Journal Management System, 46(1), 14-21. doi: 10.21608/bfemu.2021.160430
Ismail Ezz-El Deen El-Helw; Salah H. El-Emam; Gamal Ibrahim Sultan; Waleed M. El-Awady. "Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions.". EKB Journal Management System, 46, 1, 2021, 14-21. doi: 10.21608/bfemu.2021.160430
El-Helw, I., El-Emam, S., Sultan, G., El-Awady, W. (2021). 'Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions.', EKB Journal Management System, 46(1), pp. 14-21. doi: 10.21608/bfemu.2021.160430
El-Helw, I., El-Emam, S., Sultan, G., El-Awady, W. Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions.. EKB Journal Management System, 2021; 46(1): 14-21. doi: 10.21608/bfemu.2021.160430

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

MEJ- Mansoura Engineering Journal
Article 28, Volume 46, Issue 1, March 2021, Page 14-21  XML PDF (1.64 MB)
Document Type: case studies
DOI: 10.21608/bfemu.2021.160430
View on SCiNiTO View on SCiNiTO
Authors
Ismail Ezz-El Deen El-Helw email orcid 1; Salah H. El-Emam2; Gamal Ibrahim Sultan3; Waleed M. El-Awady4
1Teaching Assistant at Mechanical Power Engineering Department., Badr University Cairo., Badr 11829., Egypt.
2Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura 35516., Egypt.
3Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
4Associate professor., Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.
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.
Keywords
Film cooling; Film holes row location; Blowing ratio; Rotation; Reynolds number
Statistics
Article View: 159
PDF Download: 276