Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

AN EXPERIMENTAL INVESTIGATION OF COOLING CHARACTERISTICS AT A VANE LAMINATED END-WALL

Get access (open in a dialog) DOI: 10.1615/IHTC16.ctm.023446
pages 3989-3996

Abstrakt

This paper presented an experimental investigation on the cooling performances of a laminated end-wall, including overall cooling effectiveness and real cooling effectiveness of coolant at laminated structure. The surface temperatures were measured by an infrared thermal imaging system (ITIS) at different mass flow ratios (MFRs) and mainstream-to-coolant temperature ratios (TRs). Through the analysis and comparisons of experimental data, the following phenomena can be discovered. (1) The laminated structure can provide a good cooling performance, but the temperature near pressure side (PS) is still higher that near suction side (SS) due to the end-wall secondary flow. (2) Comparing three types of temperature drops, it can be found that near the root of PS, the heat conduction of laminated structure plays an important role; however, near SS, the influence of the internal flow around pin-fins, the impingement and the film cooling is stronger. (3) The area-averaged overall effectiveness increases evidently with MFR but the increment gradually reduces; however, both of the value and the increment of area-averaged real cooling effectiveness of coolant increase obviously with MFR. (4) TR exerts a great influence in cooling effect. However, the relationships of two types of cooling effectiveness with TR are of great difference. Namely, the area-averaged overall effectiveness significantly increases with TR; however, the real cooling effectiveness of coolant at the high TR is lower when MFR is larger than 0.4%. (5) The conductive effect of laminated structure is enhanced by enlarged TR, but gradually reduced with the increase of MFR.