Journal
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
Volume 14, Issue 9, Pages -Publisher
ASME
DOI: 10.1115/1.4053931
Keywords
film cooling; conjugate heat transfer; combined hole; crescent rib; anti-kidney vortex; conduction; forced convection; gas turbine heat transfer
Categories
Funding
- Guangdong Basic and Applied Basic Research Foundation [2019A1515111146]
- Fundamental Research Funds for the Central Universities in China [3102020HHZY030005]
- Natural Science Basic Research Plan in Shaanxi Province of China [2021JQ-104]
- National Natural Science Foundation of China [51676163]
- National 111 Project [B18041]
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This study presents a computational analysis of cooling performance for a flat plate with both film cooling and internal cooling. The results show that the effectiveness of film cooling and internal cooling performance are influenced by the geometry of the delivery channels.
Internal cooling and film cooling, as two main cooling methods in modern gas turbines, work together to protect the high-temperature components of gas turbines. This paper presents the results of a computational study on cooling performance for a flat plate with both film cooling and internal cooling using a conjugate heat transfer analysis. Three internal delivery channel geometries, smooth channel, channel roughened by square ribs (SR), and channel roughened by crescent ribs (CR), are studied with two film cooling geometries, cylindrical hole, and sister holes (SS). The respective conjugate cooling performances are compared. Detailed flow and heat transfer characteristics are presented and discussed. Results show that both film cooling effectiveness and internal cooling performances are influenced by the delivery channel geometry near the hole inlets. The sink flow effects of film cooling enhance the heat transfer coefficient near the film cooling hole inlet. At the same time, film cooling performance is affected by the internal channel as the flow inside the film cooling hole is influenced by the ribs near the hole inlets. When using sister holes, ribs in the internal channels make the anti-kidney vortex structure created by sister holes more effective by changing the mass flow distribution among the three holes.
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