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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

Выпуски:
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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i2-3.80
18 pages

EFFECTS OF GAPS BETWEEN THE SIDE-WALLS AND RIBS ON THE RIB-INDUCED FLOW STRUCTURE AND HEAT TRANSFER DISTRIBUTION INSIDE A HIGH ASPECT RATIO COOLING CHANNEL

Robert Kiml
Tokyo University of Agriculture and Technology, Department of Mechanical Systems Engineering, Koganei-shi,Nakacho 2-24-16,Tokyo 184-8588, Japan
Sadanari Mochizuki
Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei-shi, Tokyo 184, JAPAN
Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

Краткое описание

The flow visualization and heat transfer experiments were performed in a rectangular test section with an aspect ratio of 5:1, representing a cooling channel inside a trailing edge of a gas turbine rotor blade. The experiments were performed for three 60° ribs arrangements: 1) 60° full ribs, 2) 60° ribs with the gaps between the Rear wall and ribs and 3) 60° ribs with gaps between the Front wall and ribs. The obtained results showed strong effects of the rib-induced secondary flow on the heat transfer distribution. It was revealed that the heat transfer enhancement on the Rear and ribbed walls is attributed to the rib-induced secondary flow, which carries the fresh cold air from the passage core region towards the Rear wall and enhances the Nu appreciably. It was also confirmed that while the existence of the gaps between the Front wall and ribs provides more even Nu distribution on the ribbed walls due to the strengthening of the flow structure, in the case of the gaps between tire Rear wall and ribs, it causes a significant mean Nusselt number deterioration on the both ribbed and both smooth walls.