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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Transient Flow and Thermal Performance of Integrated Deflector under Periodic Supersonic Flame Impingement

Get access (open in a dialog) DOI: 10.1615/IHTC15.ipj.008838
pages 4575-4593

要約

Flow deflector is an effective approach to realize the thermal spreading and flow splitting of hot from jet impingement. A multifunction deflector combining thermal shielding and structural load support characteristics was designed by clamping the C/SiC board, aerogel plate and steel corrugated sheet together into an integrated plate. The thermal shielding performance of integrated deflector under periodical kerosene flame jet impinging was experimentally studied. A 3D numerical model with fluid-solid conjugated method was established and verified by experimental result. The effects of jet length, horizontal angel and axial angel of deflector on the heat transfer and flow field characteristics of jet impingement were studied by numerical simulation. The results show that the heated surface temperature of C/SiC board behaves the periodic variation with the periodic impinging and such variation in unit cycle trends to steady after five times successive impingement. More than 50% of jet gas is deviated to the upside of integrated plate and nearly 20% gas separately for left and right sides under a 45°horizontal angel. The decreasing horizontal angel may enhance the gas upward deflect capacity but decreases the thermal safe area behind the deflector. The variation of axial angel may significantly affect the flow distribution for two sides of deflector. The decreasing jet length or increasing horizontal angel may improve the temperature level of deflector, while the existence of axial angel decreases the temperature level of deflector.