Work

Heat transfer characteristics of high crossflow impingement channels: Effect of number of holes

Year: 2015

Type: article

Abstract: In modern turbine airfoils, narrow impingement cooling channels can be formed in a double-wall configuration. In these wall-integrated cooling cavities, the generated crossflow is one of the most important design factors, and hence, the number of impingement holes included in a channel. This study examines experimentally the influence of the number of impingement holes on the heat transfer characteristics of narrow impingement channels. The channels consist of two rows of jets where the number of holes in the axial direction is varied from 5 to 10, maintaining the same jet plate open area. Local heat transfer coefficient distributions are obtained for all channel interior walls using the transient liquid crystal technique and over a range of Reynolds numbers (20,300–41,500). The results show an important heat transfer degradation at higher open areas and a small influence of the number of holes at upstream channel positions.

Source: Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy

DOI: 10.1177/0957650915594074

Authors: S Llucià, A Terzis, P Ott, M Cochet

Institutions: École Polytechnique Fédérale de Lausanne, University of Stuttgart, Alstom (Switzerland)

Language: English

Topic: Heat Transfer Mechanisms

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2104860156

FWCI: 1.672

Cites: 28

Cited by: 26

Related to: 10