Session: 15-05: Double-Wall Internal Cooling

Submission Number: 176951

The Research of Rib Height and Offset Impingement in Double Wall Configuration 

Double wall cooling contains the film cooling of outside and impingement cooling of inner side, the cooling performance of this configuration is more efficient than that of single cooling configurations. There are film hole plate and impingement hole plate in the common double wall configuration, and some of the double wall cooling configuration have ribs between two plates. As an efficient and potential cooling configuration, further research on the performance of double wall configuration will be carried out, before the optimizing design for double wall configuration, the arrangement of the impingement hole should be analyzed, because the position of impingement hole decides the inner flow field of double wall configuration and the cooling performance.

This research analyzed the flow field and heat transfer of several typical double wall configurations through experiment and numerical simulation. 5 different double wall cases are proposed for research. The blowing ratio of experiment is 0.3 and 0.9, and that of numerical simulation is 0.3 – 3.5. These double wall cases contain different rib height and different impingement hole positions. The experiment result reflects the cooling effectiveness distribution on film hole plate surface, and the numerical simulation result shows the flow field inside the double wall configuration. The analysis of the results indicates that the influence of cylindrical rib on cooling effectiveness is less than 1%, because coolant velocity around the rib is less than 20% of the impingement flow velocity, and the heat convection is weak on the rib surface except the 75% - 100% part in rib height direction. What’s more, the cooling effectiveness keeps increasing with the rising of blowing ratio when impingement hole offsets from the film hole, the cooling effectiveness of the impingement hole offset arrangement is higher by 13.85% than that of the traditional arrangement. The result of this research provides a direction of optimizing the cooling performance of double wall configuration.

Presenting Author: Yigang Luan Harbin Engineering University

Presenting Author Biography: Yigang Luan, the professor of Harbin Engineering University, researches the cooling technology of turbine blade.

Authors:

Limin Zhang Harbin Engineering University
Yigang Luan Harbin Engineering University
Lianfeng Yang Harbin Engineering University
Zhitao Wang Harbin Engineering University
Chuangao Li Harbin Engineering University
Lishan Jiang Harbin Engineering University
Long Liu Harbin Engineering University